News aggregator

OSL Samples at Last

Geohazards in Bangladesh - Tue, 10/20/2015 - 15:02

 

Basu and Céline describing the sediment samples from  a tube well.

Basu and Céline describing the sediment samples from a tube well.

We planned to drill four or five tube wells across the abandoned channel and pick one for OSL dating samples. With the success of yesterday’s tube well drilling, we were optimistic that we could actually do the sampling. We met the drillers in the morning and headed to the next site. Since only two or three people are needed for logging the well, we left Céline and Basu and the rest of us headed off to do a short resistivity line near the first drill site. We scouted it during the drilling of the first well. On the way to the resistivity

Eating a picnic lunch in the field at side of the road.  Vans on either side protected us.  We usually had bananas, oranges, crackers, cakes and on this day pineapple as well.

Eating a picnic lunch in the field at side of the road. Vans on either side protected us. We usually had bananas, oranges, crackers, cakes and on this day pineapple as well.

site, we selected locations for three more wells. Depending on time, we will either drill two and then the sampling well or just three stratigraphic wells. Since it will be only 2 meter spacing between the electrodes, it will be quicker to set up despite less people. We are only trying to image the channel, so we don’t need a larger spacing. The site was also drier than the first two resistivity lines. We laid it out and started collecting data. My only concern was that the route was used as a path for local farmers collecting hay. I didn’t want them to knock off the electrode connections or to have them

A strong rainstorm slowed the work, but couldn't stop it.  Here our driller take a short, wet break.

A strong rainstorm slowed the work, but couldn’t stop it. Here our driller takes a short, wet break.

shocked by the pulses of electricity we sent through the electrodes.

Once the line was running, I headed back to the drill site. They once again found a think mud layer over sand. They continued drilling deeper and found the silt clay that marks the boundary between the Holocene and Pleistocene, when sea level rose following the end of the last ice age. This was a bonus and confirmed that we were on line with the Lalmai anticline farther south. We shifted to the next line, a more difficult location next to a pond, but they managed. I headed back to the resistivity line and found them starting to pack up the equipment. When I went to take a look at the instrument, I found it hadn’t finished. It had run out of memory for recording line and stopped. We quickly reinstalled the electrodes that had been

Attaching the larger 3.5" drill bit to the end of the pipe to enlarge the initial hole so we could sample through it.

Attaching the larger 3.5″ drill bit to the end of the pipe to enlarge the initial hole so we could sample through it.

pulled that we still needed. I deleted some older files that had already been downloaded and restarted acquisition. We had only lost four of 584 command lines.

By the time the second well and the resistivity line were done, it was questionable as to whether we could do the sampling well, which will take longer. The drillers going off for a lunch break settled it. We would do a third tube well today. During the drilling, the skies that had been threatening all day opened up.

Cutting the 3" PVC well liner to keep the hole open until we could sample.  We assembled two different lengths for the samples above and below the mud-sand transition.

Cutting the 3″ PVC well liner to keep the hole open until we could sample. We assembled two different lengths for the samples above and below the mud-sand transition.

The drillers and loggers got completely soaked, but kept going and we completed our five-well transect of the river valley. In the evening we compiled all the logs and discussed a sampling plan. Rather than take four samples in one well, we decided to take two, one above and one below the sand-mud transition in two different wells.

The OSL sample is over 2” wide and the wells we drilled were 1.5” wide. The driller decided it was best to drill a 1.5” well to the depth of the first sample, a few feet above the transition, and then overcore it to 3.5”. Then 3” wide PVC pipe

Hammering the OSL sampler, which is at the end of many auger extension rods.  The sampler fits inside the 3" PVC pipe that had been installed.

Hammering the OSL sampler, which is at the end of many auger extension rods. The sampler fits inside the 3″ PVC pipe that had been installed.

was lowered to keep the well from collapsing. Finally, we put the sampler on the auger rods and lowered it to the bottom of the well. We, actually people younger and stronger than me, pounded the sampler 30 cm into the bottom. Then we all had to pull up on it to get it out. The next step was to extrude the sample in its liner into a thick PVC pipe casing. The sample must be kept in the dark, so this was done inside a black plastic bag. Then the entire sample is wrapped in the black plastic bag and taped securely. The ends and outside of the sample will be discarded and only the core of the sample will be used for dating. Later, sample preparation will all have to be done in a darkroom. I helped sample on my last trip, but the was the first time I was in charge of the procedure. It went well. After the first sample, the drillers drilled to 1 ft. past the contact, overcored to the same depth, added the PVC liner and we sampled again. We

Matt, Céline and myself in a lungi toast the successful OSL sampling with green cocoanut water.

Matt, Céline and myself in a lungi toast the successful OSL sampling with green coconut water.

repeated everything for the second well and we had four OSL samples. We celebrated with green coconuts.

El Niño: Resources for Journalists

Future El Niño - Mon, 10/19/2015 - 11:34
Thick smoke from El Nino-related fires shrouds the Indonesian islands of Sumatra (left) and Kalimantan (right), September 2015. (NASA)

Thick smoke from El Nino-related fires shrouds the Indonesian islands of Sumatra (left) and Kalimantan (right), September 2015. Image: NASA

El Niño is earth’s most powerful climate cycle, influencing weather and affecting crops, water supplies and public health globally. What may be the strongest El Niño ever measured is now getting underway, and is already affecting parts of the world.

Many leading El Niño authorities are at Columbia University’s Earth Institute. They include scientists who helped form the modern understanding of El Niño; who make the official U.S. monthly global and regional El Niño forecasts; who study the deep history and future of El Niño; and who are working across the world to help nations take practical measures to cope with El Niño-related weather.

Below, a guide to people and resources at our International Research Institute for Climate and Society (IRI), Lamont-Doherty Earth Observatory (LDEO) and other centers. NOTE: In conjunction with the World Meteorological Organization and others, IRI will host a Nov. 17-18 El Niño international conference in Palisades, N.Y. Press wishing to attend, please contact Francesco Fiondella. Parts of the event will be livestreamed.

 

WEBLINKS:

The Latest Forecast

El Niño/Southern Oscillation Resources

The Essentials: An El Niño Primer

Map: How El Niño can affect global rainfall patterns

El Niño Is Driving Civil Wars, Says Study

 

IRI

Tony Barnston is IRI’s chief forecaster, responsible for monthly and seasonal El Niño forecasts in concert with the U.S. government and World Meteorological Organization.

Simon Mason is chief climate scientist, working globally with governments to apply IRI’s forecasts to practical issues including preparation for natural disasters.

Andrew Robertson is head of IRI’s Climate Group, and studies regional climate variability, predictability and change, at both short and long timescales.

Lisa Goddard is director-general of the IRI, working on a broad variety of El Niño-related issues.

James Hansen and Walter Baethgen study agricultural effects of El Niño and other climate cycles, and advise governments on how to deal with them.

Madeleine Thomson studies health effects of El Niño and other climate cycles, and advises governments how to deal with them.

 

LDEO

Richard Seager is a climate modeler who studies how El Niño and other cycles affect rainfall, and how cycles may shift as the world warms, especially in the U.S. West.

Adam Sobel is an atmospheric scientist specializing in extreme weather, and can address how El Niño might affect the United States, especially in the East.

Mingfang Ting and Alexey Kaplan are climate modelers who study the global history of El Niño through historical records and natural proxies, and how its patterns may shift in the future.

Suzana Camargo is a climate modeler who studies how El Niño influences cyclones and other violent weather worldwide.

Mark Cane is an oceanographer who co-designed the first model to successfully predict El Niño, in the 1990s; also, coauthor of research linking warfare with El Niño.

Xiaojun Yuan  is a polar scientist who studies land-sea-ice interactions, particularly in relation to El Niño and related climate cycles that connect the poles with the mid-latitudes.

 

OTHER

Marc Levy is a political scientist at the Center for International Earth Science Information Network, which studies interactions between people and natural systems.

Upmanu Lall directs the Columbia Water Center, which studies practical questions of freshwater supply and flooding, and their relation to weather cycles.

Shiv Someshwar is director of climate policy at the Center for Sustainable Development. He advises governments worldwide on adapting to El Niño and other medium-term climate shifts.

 

KEY FACTS:

  • El Niño comes every 2-7 years. Winds over the tropical Pacific Ocean abate, and the sea surface warms. The current cycle started this spring, and will probably peak this winter before subsiding in spring 2016. It will likely rank among the top events ever recorded.
  • El Niño dramatically reshapes precipitation and temperature over much of Asia, the Americas and Africa. Effects vary by region.
  • Indonesia is already suffering giant wildfires and resulting deadly haze due to El Niño-related dry weather.
  • El Niño may bring needed rain to the U.S. West, but also torrential rains and mudslides. Areas of the U.S. East may see an unusually warm winter. Parts of Asia, South America and Africa could become drier, compromising food production. Weather shifts in eastern Africa could bring disease outbreaks.
  • A recent Earth Institute study suggests that civil wars are more likely to start or worsen during the disruptive weather of El Niño.
  • Mainly due to human carbon emissions, 2015 will probably be the warmest year ever recorded; El Niño will add even more heat in 2015 and 2016.

 

Enroute to Palmer Station

Chasing Microbes in Antarctica - Sun, 10/18/2015 - 21:02

I’m currently sitting in the Dallas airport waiting for a flight to Santiago, Chile, enroute to Palmer Station for the 2015 spring season. Since there is no airfield at Palmer we’ll go in and out by boat (the ARSV Laurence M. Gould). Hopefully we’ll be at the station by October 28 and able to start doing some science not too long after that. There are a couple of reasons why I’m excited about the upcoming season. First, as I discuss in this post, conditions are highly unusual this year, with the extent of sea ice reaching a level not seen at Palmer Station for many years. The reason for this seems to be the persistent warm El Niño conditions in the tropical Pacific Ocean, now complemented by a near zero to negative Southern Annual Mode (negative SAM values are correlated to high sea ice conditions). This increase in sea ice is a counter intuitive but very real effect of global climate change; increased heat in one area of the globe alters global wind patterns and decreases the flow of heat to other areas of the globe. It hasn’t actually been very cold at Palmer Station (the high today was a balmy 24 °F at the time of writing) and how long the sea ice lasts will be depend very much on what happens to winds in the region.

Coming in an era defined by decreasing sea ice along the West Antarctic Peninsula the presence of heavy ice cover could have some interesting ecological impacts. There is a strong likelihood that it will be good for the Adélie penguins, but my primary interest is a little lower down in the food web. I’ll be studying interactions between phytoplankton, the basal food source for the WAP ecosystem, and bacteria at the onset of the spring bloom, hoping to identify cooperative interactions through patterns in bacterial gene expression. Toxic compounds produced by phytoplankton, for example, may be cleaned up by bacterial partners, allowing photosynthesis to proceed more efficiently (ultimately meaning more food for the whole food web). Observing the expression of genes coding for the bacterial enzymes that carry out these processes would be strong evidence for this kind of synergy, which leads me to the second reason I’m excited about the upcoming season.

Electron configuration of superoxide. The extra electron is one more than oxygen an handle, and makes the molecule highly reactive.

Electron configuration of superoxide. The extra electron is one more than oxygen can handle, and makes the molecule highly reactive. Image from https://commons.wikimedia.org/wiki/File:Superoxide.png.

This year I’m joined by Colleen Hansel and Jamie Collins from the Woods Hole Oceanographic Institute. Colleen and Jamie are chemical oceanographers and experts in identifying specific compounds produced by phytoplankton. Colleen has pioneered a technique to measure superoxide, a damaging free radical, directly in the water column. This is not a trivial undertaking as the half-life of superoxide is only seconds, making traditional oceanographic sampling techniques (such as a Niskin bottle) impossible to employ. Instead we will focus on sampling water in the first few meters of the water column, just above the maximum zone of primary production. Superoxide is produced during photosynthesis, when energetic electrons glob onto free oxygen. The extra electron makes oxygen highly reactive (hence superoxide; it’s a superoxidant) and physiologically damaging. Bacteria have some interesting molecular tools to deal with superoxide however, so perhaps they’ve evolved the ability to perform this service for phytoplankton in exchange for fixed carbon. Coupling observations of gene expression with measures of superoxide and other reactive chemical species is much more powerful, and will tell a much more complete story, than either does alone.

It’s impossible to anticipate how the ice will impact our science plan until we’re at the station and get a feel for how logistics will work this season. Typically sampling at Palmer Station is done by zodiac, which requires reasonably ice-free conditions. The zodiacs can push around a small amount of brash ice but lack the mass (and shrouded propeller) to deal with large quantities. The ice is solid enough this year that we may be allowed to use this ice as a sampling platform – something I’ve got plenty of experience with from previous trips to the Arctic and Antarctic. This is a little out of the norm for Palmer Station however, so we’ll have to see how negotiations proceed.

In our worst-case scenario the ice conditions deteriorate to the point that we can’t sample from it, but not so much that we can push a zodiac through it. The normal sampling procedure in this case is to use a plumbed seawater intake to sample from below the ice (with the added benefit that you can sample from the comfort of the lab), however, this won’t work given the short half-life of superoxide. In this eventuality I think we can salvage the project by focusing on ice algae in place of phytoplankton. Ice algae are essentially phytoplankton which have given up their free-living lifestyle and formed colonies on the underside of the sea ice. These dense mats are a very important food source for juvenile krill, but are understudied in the region given the inconsistent nature of sea ice along the WAP. If we can access some decent ice floes from shore I think we can make a good study of the superoxide gradient, and bacterial response, toward the ice algal colonies. Previous work has shown that ice algae can be under significant oxidative stress so they may have good reason to solicit a little help from bacteria.

Tubewells to the Rescue

Geohazards in Bangladesh - Sat, 10/17/2015 - 10:37
One of our cars drives over the makeshift road repair of a sandbag, bricks, wood and rebar while the entire village looks on.

One of our cars drives over the makeshift road repair of a sandbag, bricks, wood and rebar while the entire village looks on.

The next day we went out again for resistivity and augering. Céline picked out two alternative sites that might be drier. We drove through the abandoned valley to the site. We took the direct route and found the local road to be in a terrible state of disrepair. The vans could barely make it through. Then we hit a spot where slumping off each side of the road narrowed it too much. The villagers helped make a temporary road with bricks and wood, but it was still too narrow. Then they filled a sandbag and together with the bricks, wood and other

Céline watches the repair with some of the village women

Céline watches the repair with some of the village women.

handy items we got across. It turned out that since the Upazila (county) voted for the opposition party, they have not had their roads repaired for over a decade. This level of politicization of everything in Bangladesh really hurts the country. When we reached the location of the line, we found that ponds between the road and the fields limited our access. We walked around and found a site next to a brick factory. The line was along an irrigation ditch. Fine to walk on either side, but submerged to mid-shin if you

Standing ankle deep in mud by the resistivity meter.  The smokestack of the brick factory can be seen in the distance.

Standing ankle deep in mud by the resistivity meter. The smokestack of the brick factory can be seen in the distance.

stepped in the middle. The data looked very good after processing. We may have found the top of the Pleistocene as relatively shallow depths consistent with the site being the top of a buried anticline (folded hill).

The delays from the bad road, site searching, and a longer distance to lug the equipment meant that we couldn’t do augering. We came to the conclusion that we have to alternate days of resistivity and drilling. Not enough time in a day to do both properly. That meant

Céline and Basu describe the core brought up in the half-circle auger gouge.

Céline and Basu describe the core brought up in the half-circle auger gouge.

the next day was for augering. We went back to the soccer field site, officially BNGTi1, and started augering with all six of us. We hurried past the section we had already described. To minimize hole collapse, we switched between two augers and tried to work quickly on the descriptions. It took all of us all morning to make it to 4.8 meters. The mud was too hard. We needed to go to plan B. We would drill tube wells and sample inside the wells. Alamgir and Basu went off to the village to find a driller. The rest of us

The three-person drill team preparing the site.  Digging a post hole with rebar, inserting the bamboo pole and digging the mud pit with a kudali.

The three-person drill team preparing the site. Digging a post hole with rebar, inserting the bamboo pole and digging the mud pit with a kudali.

cleaned off the equipment and ourselves at a nearby pond and well and had lunch. After several attempts, they found a driller, but he couldn’t come until 3 p.m. I like to use all the available time I have here, but we now had a few hours break.

The three-person drill team arrived right at 3, unusual in this part of the world. I have seen the drilling technique before, but never the initial set up. In 20 minutes they set two vertical bamboo poles in the ground, tied on the cross piece to make a large H, attached a lever arm and the drill pipe, dug a mud pit for water and a

The driller standing on the frame uses his palm to keep a seal on the pipe as the lever is used to lift and drop the drill pipe.  On the fall, the mud come squirting out of the pipe.

The driller standing on the frame uses his palm to keep a seal on the pipe as the lever is used to lift and drop the drill pipe. On the fall, the mud come squirting out of the pipe.

channel to the actual well location. Then they started drilling. It was so much faster and easier than augering! In 10-20 minutes they were past the depth we reached. We don’t get continuous samples described every 10 cm (4 in.), but the lithology averaged every 5 ft. Muds come up as solid cylinders that we collect, sands as a slurry that we decant. We subdivide the 5 ft. sections if there is a lithology change. The driller caught on quickly to what we wanted and kept us informed of all changes in sediment type, which he could easily feel. Céline and Basu, an experienced logger of tube wells, did most of the sediment work,

As the drilling proceeds, the top of the pipe drops to ground level and then a new pipe is added to continue the drilling

As the drilling proceeds, the top of the pipe drops to ground level and then a new pipe is added to continue the drilling

with some help from the rest of us. As expected, the section was primarily mud with some silt. We reached the sands from the abandoned channel at 42 ft., a little deeper than I expected but reasonable. It was still early enough for us to do another. Alamgir and I scouted a second location as they finished and packed up the equipment. We completed that one, with the sands at only 20 ft. North of our transect looks like there was an island splitting the channel in two. Here would have been downstream of the island, so we

Céline and Matt walk back after a satisfying day.

Céline and Matt walk back after a satisfying day.

expected it to be shallow. Finally, things were going well. Using tubewells, we should have plenty of time to drill several stratigraphic wells and then pick one for sampling. We celebrated with dinner at the local Chinese restaurant.

paprica v0.20

Chasing Microbes in Antarctica - Fri, 10/16/2015 - 14:30

A couple of months ago I published paprica v0.11, a set of scripts for conducting a metabolic inference from a collection of 16S rRNA gene reads.  This approach allows you to estimate the functional capabilities of a microbial community if you don’t have access to a metagenome or metatranscriptome.  Paprica started as a method for a paper I was writing but eventually became complex enough to warrant it’s own publication.  Paprica v0.11 reflected this origin – it produced nice results but was cludgy and cumbersome.

Over the last couple of weeks I’ve given paprica a complete overhaul and am happy to introduce v0.20.  There are a number of major differences between v0.11 and v0.20, but the most significant difference is a more clear division between construction of the database for those who want full control (and access to the PGDBs) and sample analysis, which can proceed with only the provided, light-weight database (however you will not have access to the PGDBs).  Executing paprica v0.20 is as easy as (from your home directory, for the provided file test.fasta):

git clone https://github.com/bowmanjeffs/genome_finder.git cd genome_finder chmod a+x paprica_run.sh ./paprica_run.sh test

One really important distinction between this version and v0.11 is that metabolic pathways are NOT predicted directly on internal nodes.  This was done for reasons of organization and efficiency, but I’m not sure that it made much sense to do this anyway.  Instead the pathways likely to be found for an internal node are inferred from their appearance in terminal daughter nodes (that is, the completed genomes that belong to the clade defined by the internal node).  If a given pathway is present in some specified fraction (0.90 by default) of the terminal daughters it is included in the internal node.  You can change this value by modifying the appropriate variable in pathway_profile.txt.  Some (including myself) might like to have a PGDB for an internal node for purposes of visualization or modeling.  In the near future I’ll release a utility to create a PGDB for an internal node on demand.

Some other major improvements…

  • Fewer dependencies.  For the scripts called in paprica_run.sh you need pplacer, seqmagick, infernal, and some Python modules that you should probably have anyway.
  • Improved reference tree.  I’m still working on this, but the current method uses RAxML for phylogenetic inference and Infernal for aligment, which seems to work much better than the previous (albeit much faster) combo of Fasttree and Mothur.  Thanks to Eric Matsen for helpful suggestions in this regard.
  • More genome parameters.  I have a particular interest in how genome parameters (e.g. length, coding density, etc.) are distributed in the environment.  Paprica gives you a whole list of interesting metrics for the terminal and internal nodes.

Paprica is still in heavy development and I have a lot of improvements planned for future versions.  If you try v0.20 I’d love to know what you think – good, bad, or otherwise!  You can create an issue on Github or email me.

SCAR session on microbial ecology

Chasing Microbes in Antarctica - Thu, 10/15/2015 - 16:31

Along with colleagues from New Zealand, Argentina, and Malaysia I’m convening a session on microbial ecology and evolution at the upcoming biennial SCAR meeting in Kuala Lumpur (because there’s no better place to talk about ice than the tropics).  If this sounds like your sort of thing check it out!

S23. Microbes, diversity, and ecological roles Walter MacCormack, Argentina; Charles Lee, New Zealand; Chun Wie Chong, Malaysia; Jeff Bowman, USA

The ecology of Antarctica is largely shaped by microbes, with microbial life, including prokaryotes and unicellular eukaryotes, serving as the main drivers of ecosystem function.  Given this, it is perhaps surprisingly that our current understanding of Antarctic biota has been derived primarily from studies of metazoans. Despite major advances in the field of Antarctic microbiology in recent years there remains a knowledge gap in our understanding of the distribution, functions, and adaptations of Antarctic microbes. There is a general consensus that Antarctic microorganisms are highly diverse, and in many cases encompass endemic gene pools with unique physiological and genetic adaptations to the extreme conditions of their environment. Relatively recently, the advent of ‘omics platforms has allowed researchers to observe these processes in great detail. This session welcomes submissions on all aspects of microbial ecology and evolution in Antarctica and the Southern Ocean. This includes ‘omics-based approaches to understanding prokaryotic and unicellular eukaryotic diversity, function, adaptation, as well as laboratory and field-based studies of microbial and ecological physiology. Special consideration will be given for abstracts addressing the following issues: (1) Microbial biogeography, functional redundancy, and ecosystem services; (2) Trophic connectivity between prokaryotes and eukaryotes; (3) Cold adaptation strategy and evolution; and (4) Multiple ‘omics integration addressing systems biology of Antarctic ecosystems.

Pani, Pani Everywhere

Geohazards in Bangladesh - Wed, 10/14/2015 - 07:46

 

House in the middle of the wet fields. During the summer monsoon, it will be an island connected by the bamboo bridge.  In a month it will be connected by dry land

House in the middle of the wet fields. During the summer monsoon, it will be an island connected by the bamboo bridge. In a month it will be connected by dry land.

Six of us headed out on Oct. 8 for Brahmanbaria, northeast of Dhaka. Our target is a large winding abandoned river valley that we believe used to be the course of the Meghna River. Currently, the much smaller Titas River flows northward in the channel. Why would a river in the world’s largest delta flow the wrong way? We think that an earthquake uplifted the Comilla District area to the south. That caused the Meghna River to shift westward to its present channel and the Titas to flow up the old channel. A well drilled in the channel in 2012 shows a layer of muds overlying coarser sands.

The large abandoned channel we hoped to work in is completely flooded.

The large abandoned channel we hoped to work in is completely flooded.

We think the sands represent sediments from the old Meghna and the muds are sediments filling up the channel. We will be using resistivity to image the channel and an auger to first sample and describe the sediments and then to collect samples for dating.

Finding organic matter to date by carbon 14 is rare, so we plan to use a technique called OSL dating. OSL stands for Optically Stimulated Luminescence. Electrons from the radioactivity of all rocks get trapped in defects in quartz grains. However, they

A group of children play in a pond while we try to figure out where to find land dry enough to work in.

A group of children play in a pond while we try to figure out where to find land dry enough to work in.

are so weakly trapped that sunlight can release them. When traveling down the river, the electrons are released and then start accumulating when they are buried. By measuring the light released by the sample when optically stimulated, we can calculate the time since the sample last was exposed to light. By sampling the top of the sands and the bottom of the muds, we can date the time the river switches, or avulsed. The details of the procedure to get an OSL age are pretty complicated, but if this works, we

Our resistivity meter set up in a rice field.  We were able to collect data at the cost of very muddy legs.

Our resistivity meter set up in a rice field. We were able to collect data at the cost of very muddy legs.

will date the earthquake that caused the river avulsion.

This technique is new to me. I helped with some sampling the last time I was here, but I have not been in charge of doing it. I am also more comfortable with the quantitative data from the resistivity than the qualitative geologic descriptions we will make of the sediments. Luckily I have a good team with me, Céline, my postdoc, Matt, my former teaching assistant, and Alamgir, Atik and Basu from Dhaka University. I have spent time in the field with Alamgir and

Spools of the cable we use along where we collected the profile.  We used the slightly raised boundaries between fields for access, to avoid stepping on the crop and to stay a little less muddy.

Spools of the cable we use along where we collected the profile. We used the slightly raised boundaries between fields for access, to avoid stepping on the crop and to stay a little less muddy.

Atik before. Alamgir has conducted his own resistivity surveys. Basu was recommended to me as someone with a lot of experience in describing sediments.

We set out early in the morning for the four-hour drive. However, when we reached the river valley, we found it was almost completely flooded. We walked out on an elevated road and there was pani—the Bangla word for water—everywhere. The abandoned valley is still slightly lower in elevation than the surrounding land. Even that land has the rice fields flooded with shallow water, although the

Céline and Basu examine a core of samples brought up by the auger gouge.

Céline and Basu examine a core of samples brought up by the auger gouge.

boundaries between the fields are above water. But our main target is submerged! In the winter this will be dry land, but we are a month and a half too early. A number of scheduling issues required me to come now, although I knew it was too soon after the monsoon, but I didn’t expect so much of the land to still be flooded. Time to come up with an alternative plan.

For the resistivity, we need long straight stretches of dry land. We decided to

Kids playing soccer on the open field where we did our first auger hole.  The auger was hit by the ball several times.

Kids playing soccer on the open field where we did our first auger hole. The auger was hit by the ball several times.

do it west of the valley to try to image the thickness of the entire Holocene (last 10,000 years) section. It should vary because of the folding of the strata from the tectonics. Mapping the thickness will help us to map the position of the buried fold. For augering, we only need a small patch of land to stand on. To find it we headed south towards where the valley was uplifted more and might be drier. Not as ideal as the original location, but possible. The next morning we headed farther south and crossed the river valley. It was drier and we noted some potential augering sites. We continued to a location for resistivity. The six of us set up the >350 m long resistivity line, then Céline, Basu and I headed back to try augering while the resistivity data was collected. The augering proved very difficult. We were very slow describing the core that the auger brought up, and while we were doing it the hole would start to collapse. The muddy sediment was very stiff, and we had to hammer the auger in. We only got to 2.7 m when we stopped, nowhere near the depth we needed. Things were pretty discouraging.

Sea ice bacteria review published

Chasing Microbes in Antarctica - Tue, 10/13/2015 - 12:25

I’m really excited (and relieved) to report that my review on the taxonomy and function of sea ice microbial communities was recently published in the journal Elementa.  The review is part of a series on biological exchange processes at the sea ice interface, by the SCOR working group of the same name (BEPSII).  I’m deeply appreciative of Nadja Steiner, Lisa Miller*, Jaqueline Stefels, and the other senior members of BEPSII for letting (very) junior scientists take such an active role in the working group.  I conceived the review in a foggy haze last year while writing my dissertation, when I assumed that there would be “plenty of time” for that kind of project before starting my postdoc.  Considering that I didn’t even start aggregating the necessary data until I got to Lamont I’m also deeply appreciative of my postdoctoral advisor for supporting this effort…

The review is really half review, half meta-analysis of existing sea ice data.  The first bit, which draws heavily on the introduction to my dissertation, describes some of the history of sea ice microbial ecology (which goes back to at least 1918 for prokaryotes).  From there the review moves into an analysis of the taxonomic composition of the sea ice microbial community, based on existing 16S rRNA gene sequence data, takes a look at patterns of bacterial and primary production in sea ice, and then uses PAPRICA to infer metabolic function for the observed microbial taxa (after 97 years we still don’t have any metagenomes for sea ice – let alone metatranscriptomes – and precious few isolates).

There is a lot of info in this paper but I hope a few big points make it across.  First, we have a massive geographical bias in our sea ice samples.  This is to be expected, but I don’t think we should just accept it as what has to be.  More disconcerting, there has been very little effort to integrate physiological measures in sea ice (such as bacterial production) with analyses of microbial community structure.  A major exception is the work of the Kaartokallio group at the Finnish Environmental Group, but their work has primarily taken place in the Baltic Sea (an excellent system, but very different from the high Arctic and coastal Antarctic).  This all translates into work that needs to be done however, which is a good thing… we are just barely at the point where we can make reasonable hypothesis regarding the functions of these communities.

Taken from Bowman, 2015. Sampling locations for sea ice studies that have collected community structure data (blue), ecological physiology data (red), and both (orange). Note the strong sampling bias, particularly in the Antarctic. The black arrows point to the locations of the two community structure studies (at the time of writing) that we sufficiently deep to actually describe community structure.

Taken from Bowman, 2015. Sampling locations for sea ice studies that have collected community structure data (blue), ecological physiology data (red), and both (green). Note the strong sampling bias, particularly in the Antarctic. The black arrows point to the locations of the two community structure studies (at the time of writing) that we sufficiently deep to actually describe community structure.

*This image of Lisa pops up a lot. If you can identify what, exactly, is going on in this picture I’ll buy you a beer.

Bangladesh and India, Too

Geohazards in Bangladesh - Tue, 10/13/2015 - 07:44
Standing in front of the 240-foot tall Qutub Minar, which dates from the 1200s.

Standing in front of the 240-foot tall Qutub Minar, which dates from the 1200s.

I am heading back to Bangladesh, but this time I am stopping in New Delhi before heading to Bengal (West Bengal and Bangladesh). It is the first time that I will be in a part of India that is not adjacent to Bangladesh. Several of us are meeting there to plan for a new project that will span Bangladesh to India to Myanmar. I arrived a few hours before Nano Seeber and Paul Betka and used the time to get a new Indian SIM for my phone. After meeting up, we headed to the guesthouse of the Ministry of Earth Sciences, where we will be staying. If only the U.S. had a cabinet level department for earth sciences. It was difficult to find at night without a Hindi speaker, but we managed.

Over the next few days we had meetings about the project, but also some time for sightseeing, while

The inscription on the Iron Pillar, still unrusted despite being 1600 years old. It mentions Chandragupta's conquest of Bengal.

The inscription on the Iron Pillar, still unrusted despite being 1600 years old. It mentions Chandragupta’s conquest of Bengal.

discussing the project in the car. Most of our meals were vegetarian, and Gandhi’s birthday, which occurred while we were there, is celebrated by eating vegetarian. When two more scientists arrived from Singapore, we started the day by visiting the Qutub Minar, dating back to the 1200s and the arrival of the Muslim Delhi Sultanate, followed by the Mughal Empire in the 1500s. In the Quwwat-ul-Islam mosque, there is the famous Iron Pillar originally erected by Chandragupta in the 4th century, probably at Patna, and brought here much later. Near the beginning of the inscription it says: “in battle with the Vanga countries, he kneaded (and turned) back with (his) breast the enemies who, uniting together came against (him).” Vanga is Bengal, now split into West Bengal in India and Bangladesh.

The massive South Gate entrance to the Taj Mahal complex.

The massive South Gate entrance to the Taj Mahal complex.

 

After mostly finishing discussions, the others decided to take a day trip to Agra to see the Taj Mahal. I was able to change my flight to Kolkata to the following morning and joined them, continuing to talk science on the 4-hour drive. We had to buy the expensive tickets at 750 rupees rather than the 10 rupees the Indians were paying. However, the premium ticket lets us bypass the long lines. The Taj Mahal is the tomb of Mumtaz Mahal,

The Taj Mahal. You can see its enormous size from the line of people waiting to get inside standing on the pedestal. The line completely circled the tomb on this holiday weekend.

The Taj Mahal. You can see its enormous size from the line of people waiting to get inside standing on the pedestal. The line completely circled the tomb on this holiday weekend.

the beloved wife of Shah Jahan, the Mughal Emperor. It was built over 17 years from 1631-1648. She died in childbirth of her 14th child. He was buried there as well when he died in 1668, after being overthrown by his son. I have seen many pictures but was not expecting how enormous the structure is. The entire place is beautiful and enormous with flanking buildings, gardens and gateways. I kept wondering about the cost of building it and how many man-years of India’s peasants financed it. Perhaps this excess was why this was the peak of the Mughal Empire. Within a 100 years, the British were

The entrance to the Red Fort at Agra, a seat of the Mughal Emperors, and still used as by the Indian military.

The entrance to the Red Fort at Agra, a seat of the Mughal Emperors, and still used as by the Indian military.

taking over. Afterwards we went to Agra Fort, which is similarly gigantic, and another seat of the Mughals. There are palaces and a throne inside the red fort with views of the Taj. There are 30 buildings left, the rest having been leveled by the British to erect barracks for their troops. We didn’t get back to our hotel until 11.

I left early the next morning for Kolkata, the British Indian capital until 1911, when they moved it to Delhi. It was done to punish the Bengalis for opposing the

Standing next to a window in the Agra Fort with a view of the Taj Mahal farther down the Yamuna River.

Standing next to a window in the Agra Fort with a view of the Taj Mahal farther down the Yamuna River.

splitting of the Bengal Presidency into more manageable size, which would have cut Bengal in two. I spent the day at Calcutta University then headed back to the airport to fly to Dhaka. At my usual hotel, I met up with Jenn Pickering, a student at Vanderbilt University, and Céline Grall, my postdoc. They were teaching a short course at Dhaka University. I spent the next few days in multiple meetings and making arrangements for a week of fieldwork. It will be good to get out into the countryside.

DSCN4598

A highly decorated marble palace inside the Agra Fort. It has a beautiful fountain built into the floor.

 

Anatomy of an ‘Ice Station’

TRACES of Change in the Arctic - Sun, 10/11/2015 - 19:58
Moving equipment on and off the Healy for sampling requires organization. (photo T. Kenna)

Moving equipment on and off the Healy for sampling requires organization and creativity. (photo T. Kenna)

Completing an ‘Ice Station’ means collecting samples over a wide range of Arctic water and ice conditions. Each station means a major orchestration of people and resources. The teams gather, equipment is assembled, and the trek off the ship begins. After the first off ship exodus the sample teams are well practiced in moving equipment and setting up work areas so as not to interfere with the other stations. There is no shortage of space so spreading out is not a challenge!

Sampling on the ice also means being aware of your environment. A required component is the Polar Bear watch. Fortunately we have not seen a polar bear when out on the ice.

Sampling on the ice also means being aware of the environment,  requiring a polar bear watch. Fortunately the team has not seen a polar bear when out on the ice. (Photo T. Kenna)

Collecting a wide range of samples at multiple Arctic locations allows GEOTRACES to get an integrated look at the trace elements moving through the Arctic ocean ecosystem, and to better understand how these elements connect to the larger global ocean. Each is carefully collected. Whether the elements are ‘contaminants’ or essential nutrients there is a specific protocol in order to quantify the inputs without ‘dirtying’ the sample. It may seem odd to think of ‘dirtying’ something we label a contaminant, but in order to fully understand the concentrations and methods of transport for each element, every sample is handled with the same amount of care.

The following photo essay showcases the various ice/water sampling stations and reviews what is being collected at each.

Snow Samples: The snow collected at this station is being used in part to determine the presence/absence of contamination related to the March 11, 2011 Fukushima event.

Tim Kenna collecting a snow sample. The sample area is generally 1 or 2 square meters and collected down to the ice. (Photo B. Schmoker)

Tim Kenna collecting a snow sample. The sample area is generally 1 or 2 square meters , with the snow collected down to the ice surface below and carefully bagged. (Photo B. Schmoker)

Both the snow samples and the ice core sections will be analyzed and examined along with the information collected from seawater, suspended particulates, and bottom sediments, in order to better understand the influence of processes specific to the Arctic on the transport and distribution of several anthropogenic radionuclides.

Bagging up the snow from the snow station. Each sample is labeled by quadrant of ice collected. (Photo B. Schmoker)

Lamont’s Tim Kenna (r) and Wright State University graduate student Alison Agather (l) bag up snow. Each sample is carefully bagged and labeled by quadrant of ice collected. (Photo B. Schmoker)

Ice core samples: The ice cores are sections of sea ice, and again are being collected to determine the presence/absence of contamination related to Fukushima. In general the samplers were able to obtain 1.5 – 2 meters of ice in the cores.

Section of sea ice core collected by drilling into the ice. (Photo Cory Mendenhall, USCG)

Section of sea ice core collected by drilling into the ice. As the cores are collected they are photographed, labeled by sections, and ice properties were measured in situ prior to being taken back to the labs. (Photo Cory Mendenhall, USCG)

Melt Ponds: Surface melt ponds form on the sea ice in the long says of the Arctic summer. The warmth of the sun creates ponds that sit on top of the ice. The water collected in these ponds carries different properties than the either the sea ice from which it melted, or the ocean water from which the sea ice formed. Most often these ponds have a frozen surface layer that needs to be drilled through before water is pumped out for collection.

Surface Melt Pond Team collecting water sample. (Photo T. Kenna)

Surface Melt Pond Team collecting water sample. (Photo T. Kenna)

Beryllium-7 (7Be) Samples: Produced in the atmosphere when cosmic rays collide with nitrogen atoms, 7Be is constantly being added to the surface of the water, and therefore is a great surface water tracer.  With its very short half-life, ~ 53 days, 7Be can be used to track water parcel circulation as it moves between surface and deep water (which has no significant source of the 7Be isotope). The surface water pulls the 7Be with it as it moves down deeper into the ocean, allowing us to track and time the mixing process.

Pumping water through the hole drilled by auger. (photo B. Schmoker)

The Beryllium team first uses a gas powered auger to create a hole for a pump and a CTD instrument (used to measure salinity, temperature and depth)  to fit through. They then pump water through the hole for collection. Because beryllium is in very small amounts they pump thousands of liters of water from 3 or 4 depths. Each is pumped through big cartridges that absorb the Be. (photo B. Schmoker)

Dirty Ice Samples:  The dirty ice work is more opportunistic, and therefore is not be part of each ice station. If dirty ice is spotted it will be sampled, and while it may not be part of each ice station, it is part of the overall GEOTRACES protocol. While most of the stations sample for quantification, i.e. grams of sediment/ml ice, the dirty ice samples are used more for characterization, i.e. composition or mineralogy.  For Tim’s work the collection of dirty ice is used to look at sediments originating from continental shelves bordering the Arctic, with the goal of evaluating or characterizing dirty ice as a transport vector for anthropogenic radionuclides.

Tim sampling dirty ice. (photo C. Mendenhall).

Tim sampling dirty ice with a pick and bucket. (photo C. Mendenhall).

Minimal Processing of the samples collected at the stations will occur on the Healy. The snow and Ice gets melted and the seawater acidified. The focus of the trip is to collect as much material as possible. There will be plenty of time for processing when  the researchers are back at their home institutions.

Margie Turrin is blogging for Tim Kenna, who is reporting from the field as part of the Arctic GEOTRACES, a National Science Foundation-funded project.

For more on the GEOTRACES program, visit the website here.

Microbial ecology of the cryosphere

Chasing Microbes in Antarctica - Wed, 09/23/2015 - 13:38

A quick post on an excellent review published last week by Antje Boetius and co-authors (including Jody Deming, my PhD advisor) in Nature Reviews Microbiology, titled Microbial ecology of the cryosphere: sea ice and glacial habitats.  The review, focused on viral, bacterial, and archael microbes, provides an excellent overview of the major habitats within the cryosphere (broadly glacial ice, sea ice, and snow), the challenges and opportunities for microbial life, and the observed distribution of taxa and genes (to the extent that we know it).  Like most Nature Reviews it is written for a broad audience and assumes no deep knowledge of microbial ecology or the cryosphere.

Taken from Boetius et al., 2015.

Taken from Boetius et al., 2015.  Top: a schematic of different elements of the cryosphere, b: warm, summertime sea ice, c: the supraglacial environment, featuring a meltriver, d: cold winter sea ice, e: the subglacial environment, featuring the Blood Falls outflow from Taylor Glacier.

Plenty of reviews have been written on microbial life at low temperature, what makes this one stand out to me is the ecological focus.  Although discussions of biogeography (i.e. what taxa are where) and metabolism are woven throughout the review, the emphasis is on habitats, including newly recognized habitats like frost flowers and saline snow.  Check it out!

Arctic Magic – One research vessel multiplies to hundreds!

TRACES of Change in the Arctic - Mon, 09/21/2015 - 16:16
Ship crew is deployed to position the boxes of small 'seaworthy vessels' and the tracking buoy onto the ice. (Photo Bill Schmoker)

Ship crew is lowered in a basket down to the ice to deploy two boxes of small ‘seaworthy vessels’ and the tracking buoy onto the ice, part of the ‘Float Your Boat’ project. (Photo Bill Schmoker)

Geoscientist Tim Kenna works with his son's class to decorate boats for the Float Your Boat project. Jack Kenna works to get his boat 'Arctic ready'.

Geoscientist Tim Kenna works with his son’s fifth grade class to decorate boats for the ‘Float Your Boat’ project. Jack Kenna works to get his boat ready for an Arctic deployment.

In preparation for their Arctic work GEOTRACES linked with “Float Your Boat”, an education program with a unique concept. ‘Float Your Boat’ blends the themes of historic Arctic drift studies, modern GPS technology and hands on science, to engage local communities with work in remote science locations. Scientists currently onboard the Research Vessel Healy spent time last spring recruiting and meeting with school groups to share information about the Arctic, their upcoming science cruise and collecting small student decorated wooden boats that would become part of the project.

A note on the computer station of Tim Kenna announces that it is time to deploy the  'Float Your Boat' project.

Sometimes the best way to deliver information on a ship is to tack up a sign on a high use item. A note on the computer station of Tim Kenna is used to notify him that it is time to deploy the ‘Float Your Boat’ project. (Of course smiley faces always help!)

For over a month the science team has been anticipating the deployment of these small wooden vessels since this builds a direct connection to their families and communities back home.

The student boats are deployed in a 100% biodegradable box lowered carefully onto an iceberg along with an iridium satellite tracking buoy. The tracker is activated ‘calling home’ so that it can be used to track the circulation of the ice. Over time the ice is expected to melt and the box will biodegrade sending these small floating wooden boats into the high seas of the Arctic Ocean.

The location of the Arctic drift boats was close to the North Pole. In many earlier years his would have been an area that was inaccessible for a ship to penetrate to set up this drifter experiment.

The location of the Arctic drift boats was close to the North Pole. In many earlier years this area would have been inaccessible for a ship to penetrate to set up this drifter experiment.

Once the box degrades the boats will be separated from the tracker, but each boat has been identified by the students with their school and their own name and stamped with the project contact information. If any of the boats wash up onshore there is enough information for the locator to contact ‘Float Your Boat’ with a date and location. Through online tracking of the iridium satellite this project provides opportunities for students to learn about Arctic change, marine circulation, marine debris transit and maritime careers.

Boxes one and two are deployed on the ice with the tracker and the sip crew is pulled back up to the Healy. (Photo T. Kenna)

Boxes one and two are deployed on the ice with the tracker and the ship crew is pulled back up to the Healy. (Photo T. Kenna)

The ‘Float Your Boat’ project concept comes from early Arctic science, when drifting ice floes were used to track Arctic circulation. In the International Geophysical Year (1957-58) Lamont scientist Ken Hunkins resided for two 6 month stints on Ice Station Alpha, a station built on top of the Arctic sea ice. Science teams were flown in by plane and dropped, along with their equipment, about 500 miles north of Alaska. There they studied a range of ocean parameters, including tracking their own progress as they moved along with the ice drift. The 18 months of operations tracked the ice floe movement as it shifted ~2000 miles around the Arctic in a clockwise manner until it was just north of Ellesmere Island, Canada. (map below)

Annotated historic map from the International Geophysical Year (1957-1958) of the Floating Arctic Stations. Red line shows Alpha Station, the US first floating ice research station, representing some of the original 'Arctic drift studies'. (Photo/annotation M. Turrin; map Ken Hunkins)

Annotated historic map of the Floating Arctic Stations, from the International Geophysical Year (1957-1958) . The red line shows Alpha Station, the US first floating ice research station, and one of the original ‘Arctic drift studies’. (Photo/annotation M. Turrin; map Ken Hunkins)

Somehow the rigid presence of the Healy seems infinitely more secure than a few tents and rigs set directly on the mile long by half-mile wide section of sea ice under station Alpha.

Float Your Boat 'vessels' were loaded into boxes and shipped to the Healy in advance of the deployment.

Float Your Boat ‘vessels’ were loaded into boxes and shipped to the Healy in advance of the deployment.

But even earlier than the science drift experiments were the expeditions of early Arctic explorers, like Fritdjof Nansen, who froze his ship the “Fram” into the northern icepack during his voyage of 1893-1896 in hopes of drifting to the North Pole. He did not succeed, however he did learn about Arctic drift and spurred additional research on this topic, perhaps leading to these young Arctic researchers and their ‘vessels’.

Tim Kenna is shown here on the right with Marty Fleischer on the left at the North Pole. Tim  worked with several groups of local students including  Pearl River High School A.P. Environmental Science Students and his son's fourth grade class at Upper Nyack Elementary School. 

Tim Kenna is shown here on the right with Marty Fleisher on the left at the North Pole. Tim worked with several groups of local students including Pearl River High School Marine Science Club and his son’s fifth grade class at Upper Nyack Elementary School in the ‘Float Your Boat’ project for GEOTRACES.

Margie Turrin is blogging for Tim Kenna, who is reporting from the field as part of the Arctic GEOTRACES, a National Science Foundation-funded project.

For more on the GEOTRACES program, visit the website here.

And now…

Chasing Microbes in Antarctica - Wed, 09/16/2015 - 00:24

…for something completely different.  My wife and I are expecting our first child in a few months, which is wonderful and all, but means that we are faced with the daunting task of coming up with a name.  Being data analysis types (she much more than me), and subscribing to the philosophy that there is no problem that Python can’t solve, we decided to write competing scripts to select a good subset of names.  This is my first crack at a script (which I’ve titled BAMBI for BAby naMe BIas), I’ve also posted the code to Github.  That will stay up to date as I refine my method (in case you too would like Python to name your child).

My general approach was to take the list of baby names used in 2014 and published by the Social Security Agency here, bias against the very rare and very common names (personal preference), then somehow use a combination of our birth dates and a random number generator to create a list of names for further consideration.   Okay, let’s give it a go…

First, define some variables. Their use will be apparent later.  Obviously replace 999999 with the real values.

get = 100 # how many names do you want returned? wife_bday = 999999 my_bday = 999999 due_date = 999999 aatc = 999999 # address at time of conception size = (wife_bday + my_bday) / (due_date / aatc) start_letters = ['V','M'] # restrict names to those that start with these letters, can leave as empty list if no restriction desired sex = 'F' # F or M

Then import the necessary modules.

import matplotlib import numpy as np import matplotlib.pyplot as py import math import scipy.stats as sps

Define a couple of variables to hold the names and abundance data, then read the file from the SSA.

p = [] # this will hold abundance names = [] # this will hold the names with open('yob2014.txt', 'r') as names_in: for line in names_in: line = line.rstrip() line = line.split(',') if line[1] == sex: if len(start_letters) > 0: if line[0][0] in start_letters: n = float(line[2]) p.append(float(n)) names.append(line[0]) else: n = float(line[2]) p.append(float(n)) names.append(line[0])

Excellent. Now the key feature of my method is that it biases against both very rare and very common names. To take a look at the abundance distribution run:

py.hist(p, bins = 100)

figure_1Ignore the ugly X-axis.  Baby name abundance follows a logarithmic distribution; a few names are given to a large number of babies, with a long “tail” of rare baby names.  In 2014 Emma led the pack with 20,799 new Emmas welcomed into the world.  My approach – I have no idea if it’s at all valid, so use on your own baby with caution – was to fit a normal distribution to the sorted list of names.  I got the parameters for the distribution from the geometric mean and standard deviation (as the arithmetic mean and SD have no meaning for a log distribution).  The geometric mean can be calculated with the gmean function, I could not find a ready-made function for the geometric standard deviation:

geo_mean = sps.mstats.gmean(p) print 'mean name abundance is', geo_mean def calc_geo_sd(geo_mean, p): p2 = [] for i in p: p2.append(math.log(i / geo_mean) ** 2) sum_p2 = sum(p2) geo_sd = math.exp(math.sqrt(sum_p2 / len(p))) return(geo_sd) geo_sd = calc_geo_sd(geo_mean, p) print 'the standard deviation of name abundance is', geo_sd ## get a gaussian distribution of mean = geo_mean and sd = geo_sd ## of length len(p) dist_param = sps.norm(loc = geo_mean, scale = geo_sd) dist = dist_param.rvs(size = sum(p)) ## now get the probability of these values print 'wait for it, generating name probabilities...' temp_hist = py.hist(dist, bins = len(p)) probs = temp_hist[0] probs = probs / sum(probs) # potentially max(probs)

At this point we have a list of probabilities the same length as our list of names and preferencing names of middle abundance. The next and final step is to generate two pools of possible names. The first pool is derived from a biased-random selection that takes into account the probabilities, birth dates, due date, and address at time of conception. The second, truly random pool is a subset of the first with the desired size (here 100 names).

possible_names = np.random.choice(names, size = size, p = probs, replace = True) final_names = np.random.choice(possible_names, size = get, replace = False)

And finally, print your list of names! I recommend roulette or darts to narrow this list further.

with open('pick_your_kids_name.txt', 'w') as output: for name in final_names: print name print >> output, name

A Week of Firsts for This Arctic Nation

TRACES of Change in the Arctic - Fri, 09/11/2015 - 18:06
47 AM the ship reached the North Pole, becoming the 1st U.S. surface vessel to do so unaccompanied. (photo U.S. COAST GUARD)

Gathered at the North Pole are the crew of U.S. Coast Guard Cutter Healy and the GEOTRACES science team. On Sept. 5 at 7:47 a.m., the ship reached the North Pole, becoming the first U.S. surface vessel to do so unaccompanied. Photo: U.S. Coast Guard

We are closing in on a week of intense focus and excitement for GEOTRACES and for the United States around the Arctic. It was barely a week ago (Aug. 31) that President Obama became the first sitting president to visit Alaska, refocusing the other 49 states on the fact that we are indeed an Arctic Nation. This historic first was followed closely by another, the Sept. 5 arrival of the U.S. Coast Guard Cutter Healy with the U.S. GEOTRACES scientists on board at the North Pole, completing the first U.S. surface vessel transit to the pole unaccompanied by another icebreaker. Combined with this, U.S. GEOTRACES became the first group ever to collect trace metals at the North Pole. You might assume these three items are unrelated, but they are in fact tightly linked.

GLACIER Conference logo

GLACIER Conference logo

In convening the GLACIER Conference (Global Leadership in the Arctic: Cooperation, Innovation, Engagement & Resilience) in Alaska, President Obama focused on a region that is fast changing due to its fragility and vulnerability to climate change. The meeting timing aligned nicely with the U.S. assuming chairmanship of the Arctic Council, and was a perfect platform for the president to address climate change, an issue that he has tackled aggressively. Conference sessions on the global impacts of Arctic change, how to prepare and adapt to a changing climate, and on improved coordination on Arctic issues all align with the work of Arctic GEOTRACES, although tackled from a different angle.

It was while he was in Alaska that President Obama announced a commitment to push ahead the schedule for adding to the U.S. icebreaker fleet. The “fleet” has dwindled to just 3 U.S. vessels at present, and limits our ability to work in the Arctic. The goal of adding another icebreaker by 2020 will help to address this. “Working” in the Arctic for this Coast Guard cutter includes supporting the research that is critical to our being able to develop a baseline understanding of conditions and more accurately predict the future changes.

Ship camera as the US Cutter Healy arrives at the North Pole. (Photo US Healy)

Ship camera as the U.S. Cutter Healy arrives at the North Pole. Photo: U.S. Healy)

Evidence for change in the Arctic is found in the ability of the U.S. Coast Guard Cutter Healy to cross the Arctic ocean along its longest axis (the Bering Strait route) and penetrate deep into the sea ice to make it to the North Pole unaccompanied. The ice has been thinner than expected and experiencing a much higher degree of melt. Ice stations, where the science team gets out onto the ice to sample, have been postponed because of safety concerns from the thin ice conditions. Everyone, including the captain, has been surprised by the conditions. The thin ice has increased the speed of travel. Although some thick (up to 10 feet) and solid ice has been encountered, much of the cruise has been spent traveling at up to 6 knots, and much less fuel has been used than expected because of this.

Members of the team who are not out on deck with the equipment 'manage' the cast from the aft control room. (photo T. Kenna)

Members of the team who are not out on deck with the equipment “manage” the cast from the aft control room. Photo: T. Kenna

The last week has been action packed for all 145 people on the Healy. First. a “superstation” was run, a 57-hour sampling stop with a large number of samples collected in the ~4,000-meter-deep water. A super station includes additional hydrocasts and pump sampling for the groups like Tim Kenna’s, that require large volumes of sample water. This was also a crossover station with the German GEOTRACES cruise on the Polarstern. Crossover means some of the extra samples collected can be used to do intercalibration (check to see that the results compare) between the science teams on the two ships. The German ship will collect at the exact same location. With large sampling projects using multiple labs and sampling teams, intercalibration becomes extremely important for interpreting the results.

The 'man-basket' lowering Tim Kenna and crew member to the ice via crane to do sampling from a pressure ridge. (photo Bill Schmoker)

The “man-basket” lowering Tim Kenna and crew member to the ice via crane to do sampling from a pressure ridge. Photo: Bill Schmoker

After our long superstation, the team went almost immediately into a dirty-ice station (ice that entrains sediment as it freezes). This ice can form in several ways: during the spring thaw when ice dams in Arctic streams force sedimented water out onto the ice, where it refreezes; during cold storms that churn up sediments in the shallow shelf regions to refreeze on the surface ice; and when shallow areas freeze solid, collecting sediment at the base, and later break away. Once the ice is formed, it moves into the Arctic circulation pattern, so identifying the source of the sediment can help us better understand the temporal and spatial nature of Arctic circulation. This type of ice has high value for Tim’s research, since short-lived radioactive isotopes are frozen into the ice with the sediments, providing a timer for the formation of the ice.

The dirty ice station was followed by an ice-algae station. Both of these entail stopping the ship and craning over two people in a “man-basket” where they can get out and sample (see image). This was followed closely by two full ice stations, where many groups went out on the ice to do their sampling; some for over 12 hours (brr). The second ice station had wind chills of -14 C.

Field time, especially in the polar regions, is expensive and limited, so while in the field it is critical to complete as much science as possible. Sleep happens later when the team is back home.

Lamont Note: As part of the Healy’s instrument package, they standardly carry a CO2 instrument from Lamont’s Taro Takahashi. This was onboard when the Healy reached the North Pole (89.997 °N). The partial pressure of CO2 (pCO2) in seawater was found to be 343.3 micro-atmospheres at the water temperature of -1.438 °C. This is about 50 micro-atmospheres below the atmospheric pCO2 of 392.7 micro-atmospheres, and indicates that the Arctic Ocean water is rapidly absorbing CO2 from the air. The measurements confirm that the Arctic Ocean is helping to slow down the accumulation of the green house gas in air and hence the climate warming.

Margie Turrin is blogging for Tim Kenna, who is reporting from the field as part of the Arctic GEOTRACES, a National Science Foundation-funded project.

For more on the GEOTRACES program, visit the website here.

Habitat

Geopoetry - Fri, 09/11/2015 - 12:00
The Island of Manhattan. Image from the Wildlife Conservation Society

Images representing the past and present Island of Manhattan. Credit: Wildlife Conservation Society

 

People are sometimes startled

By falcons perched on balconies, raccoons slinking through the park,

Bluefish blitzing herring up the river, coyotes tracing train tracks.

Isn’t it amazing, or isn’t it disturbing, we say,

A creature’s daring foray into our hard-paved empire.

I prefer the long view – that of Manhattan Schist, let’s say,

Having been buried in mile-thick ice,

Thoroughly sculpted and scoured,

Recolonized by green things and red-blooded things

Over and over again, with each ephemeral ice age.

From that vantage, it is we who are the curious invaders, an encrusting colony

Of organisms with a stunning talent for creating habitat for ourselves.

Diggers of ditches, un-earthers of bones, surveyors of history

All tell a tale of an earlier island of Eden,

Teeming with silver-backed, feather-tipped, vibrant-green life

Not so long ago.

The Schist, sparkling darkly in the park, is not surprised

By ‘coons and hawks, toothed and clawed neighbors,

Nor by the eels, pipers, moths, terrapins, raptors, seals, spiders,

By great trees ripping upwards through pavement.

You might think that I am about to lament all the changes we have wreaked

On this landscape, but I refuse to despise my own species.

I refuse to accept the conservationist’s guilt,

To draw boxes around wildness and around civilization,

And ignore the reality that these two can never truly be separated.

Instead, I am in awe of the spectacular forces that shape my world,

From grinding ice sheet to pulverizing jackhammer,

From rising skyscraper to ascending oak.

I live my animal life deliberately,

Knowing that we can never extract ourselves from Nature,

And that the boundaries we draw are not real.

 

This is one in a series of posts by Katherine Allen, a researcher in geochemistry and paleoclimate at the Lamont-Doherty Earth Observatory and the School of Earth & Climate Sciences at the University of Maine.

It’s as Clear as Mud

TRACES of Change in the Arctic - Sun, 09/06/2015 - 21:30
Core sample

Attempting to get a small sediment sample from the bottom of the Arctic. Photo: Bill Schmoker

Sediment coring the bottom of the world’s oceans is something that Lamont knows a lot about. Since 1947 Lamont has been actively collecting and archiving sediment from around the world. Currently our Core Repository contains sediment cores from every major ocean and sea in the world, some 18,700 cores. This is in large part due to Lamont’s first director, Maurice Ewing, who instilled a philosophy of “a core a day” for all ocean research vessels. Ewing firmly believing that if we had the sediment, we would be able to piece together patterns and stories about our planet, so every day at noon, or thereabouts, the ship would collect a core.

core repository

Historic Image of Lamont’s Core Repository. Photo: Lamont archive

Scientists from around the world have requested slivers of mud from the cores in the repository to unlock Earth’s mysteries and secrets. The cores in Lamont’s Core Repository are no stranger to revealing stories of Earth systems, including those of climate cycles. Almost 40 years have passed since the groundbreaking work of the CLIMAP group that used the cores to connect the start of Earth’s glacial cycles to changes in eccentricity, precession and tilt. (Hayes, Imbrie and Shackleton, 1976) . Collecting sediment on this Arctic GEOTRACES cruise will help us understand more of the stories locked in the oceans.

The length of a core is dictated by the goal of the collection. Early Lamont cores were more about collecting just to gather the material because the ship was there. These early cores were generally 6 to 9 meters long, although one incredibly long 28.2m core was collected from the Central Pacific. Locally cores have been collected on the Hudson River and local marshes that are closer to 1 or 2 meters in length.

Coring in the Hudson River

A file photo of Tim Kenna collecting a sediment core from the Hudson River. Note the length of core and the heavy weights on top to help with penetrating deep into the mud on the bottom of the Hudson. The very short cores to be collected for GEOTRACES will be much different. Photo: Margie Turrin

For the sampling GEOTRACES is doing in the Arctic, there is a specific goal of collecting just the top few dozen centimeters of sediment and the water just above it, yet at a depth of ~2,200 meters. This will require a much different technique than what was used for the Central Pacific core.

core

Mono-corer with the small section of core retrieved. Note the small weights to help penetrate the sediment, much less weight than is used on the Hudson River core pictured above. Photo: Bill Schmoker

The sediment in this region is soft, so the plan was to drop a small, general-purpose device called a mono-corer over the side of the ship with a few small weights on top to help drive the core tube in straight. The corer would hang below the bottom of the rosette of water samplers, far enough below that the rosette would remain mud-free but still able to collect near-bottom water samples. The mud in the mono-corer would be held in place by a spring-loaded door that snapped closed once the mud was inside and the tube began its return trip to the ship. All sounded good.

core

Core on its way up to the Healy. Note the “cone-of-silence” rigged by Tim Kenna and Marty Fleicher to stop any interference with the rosette altimeter used to lower the device. Photo: Bill Schmoker

Although the plan was good, things don’t always go perfectly. Making sure the corer actually penetrated the sediment without tipping over or over-penetrating and compressing the top sediments proved challenging, as did ensuring the sample made it back to the ship intact. After several attempts a special “cone-of-silence” (any Get Smart fans out there?) was rigged up by the two Lamonters, Tim and Marty Fleischer, to avoid interference with the communications that were connecting with the rosette altimeter, controlling the lowering of the device. The cone was installed and the speed of the core lowering was slowed. Success! ‘Houston we have mud!’

Now to unpack its secrets.

Margie Turrin is blogging for Tim Kenna, who is reporting from the field as part of the Arctic GEOTRACES, a National Science Foundation-funded project.

For more on the GEOTRACES program, visit the website here.

Scouring Arctic for Traces of Fukushima and Cosmic Rays

TRACES of Change in the Arctic - Sat, 08/29/2015 - 21:50
ice breaker

The Healy is doing a lot more ice breaking now that we have moved into the Arctic ice cap. Photo: Tim Kenna

Sounds like the basis for a great scifi thriller… “scientists scour Arctic, hunting for traces of nuclear fallout and ejections from cosmic ray impacts.” In reality this thriller theme is the actual core of the GEOTRACES mission. Let’s break it apart a bit to better understand it.

Fukushima and Other Nuclear Fallout

The project Tim is focused on is the human introduced (anthropogenic) radionuclides that are released into the environment as a result of nuclear industrial activities, things like weapons production and testing, as well as nuclear power generation and fuel reprocessing. This includes isotopes of plutonium, neptunium, cesium, strontium, iodine and uranium that are not normally found in the environment. The major sources of these nuclides include fallout from atmospheric weapons testing and liquid releases from European nuclear fuel reprocessing.

Radionuclides lab

The workspace set aside for the radionuclides work. If you have ever done “Where’s Waldo?” see if you can find Tim’s spot. Photo: Tim Kenna

One goal of our project is to determine the budgets (overall input and export) of these contaminants. Samples collected along our cruise track combined with those collected on the European GEOTRACES cruise taking place on the Polarstern will allow us to do this.

We are also collecting samples to evaluate for the presence and distribution of contamination related to Fukushima. Two cesium isotopes were released into the environment as a result of Fukushima; Cesium 137, with a half-life of 30 years, and Cesium 134, with a much shorter half life of two years, so little is left from past nuclear testing. Fallout from Fukushima is an excellent tracer to help us learn more about ocean circulation and transport models.

Cosmic Ray Interactions

Paul Aguilar

Paul Aguilar, part of the Beryllium 7 sampling team, signals thumbs up to the winch operator on a hydrocast. Hand signals are a major method of communication between ship operators and scientists and crew on deck. Photo: Tim Kenna

Another part of the GEOTRACES team is measuring Beryllium-7 (Be-7), a cosmogenic nuclide that is created when a cosmic ray breaks apart heavier atoms into smaller atoms. Be-7 is a short-lived isotope with a half-life of 53 days. We can use this short half-life to tell us something about water circulation and exchange rates under the ice. Currently the team is measuring Be-7 in the marginal ice zone. Once the ship reaches a section of ice that is large and thick enough for the scientists to work on, we will drill through to measure under the ice as well.

Yes We Have a Bubble Room!

bubble room

Jess and Sarah work in the heavily protected bubble room to keep their samples from being contaminated by elements on the ship. Photo: Tim Kenna

When we said “trace” elements we weren’t kidding! Jess and Sara are part of the team working on contamination-prone trace elements. Their work is done in an inflatable bubble to keep it ultra clean. The bubble is inflated using high-efficiency particulate arresting (HEPA) filtered blowers. Trying to measure very small trace elements without contamination is extremely difficult, and it is a testament to their skills that they can measure elements such as zinc and iron, which are extremely low in seawater but very common on the ship (rust never sleeps!). Getting an accurate measure means not picking up any of that ship input.

caught wires

Sampling in and among the ice floes can mean equipment wires get caught on the ice, as happened here. It can be tricky to untangle caught wires to free equipment. Photo: Tim Kenna

In order to run all these great experiments, we need samples, so we are collecting and filtering water at as many stations as we can. Sampling in the ice pack is very different than sampling in an open ocean. Station locations must be very carefully selected to reduce the risks of the equipment getting entangled in the ice and ending up either crushed or ripped away. Even in less dense ice, we caught the hydrowire on an ice floe (above).

Supersized

Everything is supersized on a ship like the Healy, from the large metal A-frame support that is used to lower collection equipment (yellow/buff colored) to the circular metal rosette which is filled with niskin collection bottles for gathering water samples. The deployment of a rosette for sampling is called a “hydrocast.” This allow scientists to collect water at a variety of depths. The images below are from a few days ago, before we hit denser pack ice.

hydrocast

You can see if you look carefully at the photos that these bottles have snapped closed, sealing the water sample inside. When deployed the bottles are opened at both ends so water freely flows through as the rosette descends to the sample depth. Photo: Tim Kenna

The rosettes can hold up to 36 bottles. Each bottle can be programmed to snap closed at a specific depth, so in one deployment, water can be collected at up to 36 different depths. This is extremely valuable for teasing apart circulation through tracking small particles entrained in the water column at different depths. The water collected in these sampling bottles will be used for a range of studies.

hydrocast

The rosette takes several people to stabilize and guide it over the side of the ship, and the A frame is several stories high. Photo: Tim Kenna

This sequence of the retrieval of this hydrocast involves four people to collect and stabilize the rosette, as well as the personnel up above operating the winch to lower the equipment, and several people in a console monitor verifying both the depth of the rosette and that the cable on the equipment is sending up the necessary data. Operating the equipment on a ship is labor intensive, but each deployment retrieves enough sample material for not only the team on board the Healy, but for colleagues and partners waiting back at their home institutions for samples.

Margie Turrin is blogging for Tim Kenna, who is reporting from the field as part of the Arctic GEOTRACES, a National Science Foundation-funded project.

For more on the GEOTRACES program, visit the website here.

 

Moving into the Realm of the Polar Bear

TRACES of Change in the Arctic - Mon, 08/24/2015 - 18:15
Looking out over the Arctic sea ice as the ship moves out over the deeper ocean. (Photo credit Tim Kenna)

Looking out over the Arctic sea ice as the ship moves out over the deeper ocean. Photo: Tim Kenna

The Healy has now moved off of the shallow continental shelf that extends around the Arctic land border (shown in white in the map below) into the deeper center of the Arctic Ocean. In our last blog we noted that some of the questions Arctic GEOTRACES is addressing include quantifying the fluxes of trace elements and isotopes into and out of the Arctic Basin from the two oceans through choke points like the Bering Strait, as well as characterizing how much comes from rivers. Arctic GEOTRACES is also studying what regulates the Arctic shelf to deep basin exchange, and the role of sea ice in the transport of trace elements and isotopes. (Follow the expedition here.)

The position of the research vessel Coast Guard cutter Healy on August 24, 2015.

The position of the research vessel Coast Guard cutter Healy on Aug. 24, 2015.

The oval shaped blue area in the map above is the basin of the Arctic Ocean, ranging from ~3,500 meters to ~5,000 meters at its deepest. The Healy is currently over a ridgeline named the Mendeleev Ridge, after a Russian chemist and inventor, Dmitri Mendeleev, long dead when the ridge was first discovered by fellow Soviets in 1948. Mendeleev Ridge is about 1,000 meters shallower than the deep Arctic, bottoming out at ~2,500 meters in depth. The Russians maintain that the ridge, with its long reach into the Arctic basin, gives them claim to large sections of the ocean stretching out to the North Pole. The claim remains unresolved, in part because there are so many questions that still remain about the Arctic. As we move into the basin, we will be sampling to try and better constrain what happens at the shelf/basin interface.

polar bear text

All hands on deck alert – huge polar bear 100 yards ahead! Photo: Tim Kenna

When we venture into the Arctic for research, for most of us there is the lingering hope that a polar bear will appear on our watch; at least as long as we are safely outside of its reach. Several polar bear have been spotted by the watchful eyes of the crew as we have moved into the more tightly packed heavy ice away from the marginal ice zone. However, today a very large bear (yes the alert text says “huge”!) was spotted, and it seemed to have us under thoughtful consideration. The following is a string of images that relay the majesty of this incredible creature in its natural environment, moving with great agility over the sea ice.

 Tim Kenna

Polar bear taking a drink and assessing the ship full of researchers. Photo: Tim Kenna

Polar Bear (photo credit Tim Kenna)

Polar bear carefully testing the thinning stretch of sea ice.  Photo: Tim Kenna

Polar Bear (photo credit Tim Kenna)

The polar bear coloring matches easily to the Arctic ice surroundings. Photo: Tim Kenna

Polar bear live only in the Arctic and rely almost entirely on the marine sea ice environment for their survival. They use the ice in every part of their daily life, for travel, for hunting ringed seal, their favorite food, for breeding and in some cases for locating a birthing den. Their wide paws, which you might be able to see in these photos, distribute their weight when they walk on the sea ice, which late in the season can be quite thin in the annual ice region, melting down to only a thin crust over the water. Their large size, clearly visible in these photos, belies the fact that they are excellent swimmers, helped by their hollow fur, which traps air to keep them buoyant, as well as the stiff hair and webbing on their feet. For all their cuddly appearance, they are strong hunters. Currently polar bear range in conservation status from Vulnerable internationally, to Threatened in the U.S., primarily the result of a warming climate that is melting their habitat…sea ice.

Polar Bear moving easily across the ice. (photo credit Tim Kenna)

Polar bear move easily across the ice, even though males can weigh up to 1,500 lbs. Photo: Tim Kenna

Polar bear

Polar bear use their natural agility to avoid the thinner sections of sea ice. Photo: Tim Kenna

Polar Bear takes measure of the Healy. (Photo credit Tim Kenna)

Polar bear takes measure of the Healy. Photo: Tim Kenna

Polar bear taking a moment to drink. (Photo credit Tim Kenna)

Polar bear taking a moment to drink from an open lead in the Arctic. Photo: Tim Kenna

Arctic Sea Ice Extent

Daily Arctic sea ice extent Aug. 23, 2015. Source: National Sea Ice Data Center

The Arctic is approaching the annual low for sea ice extent, which occurs each year in September. An image of sea ice extent for today (shown in white) against an average of the last thirty years (outlines in yellow) shows how our annual sea ice cover has dropped. Today’s cover is 2.24 million square miles (5.79 million square kms), which is  521,200 sq. miles (1.35 million square kms) below the last 30 year average period. Aside from being of concern to the polar bear, this is part of why Arctic GEOTRACES is so important. We need to understand the role of sea ice in current circulation patterns and delivery of trace elements and isotopes in the Arctic, and then bring this more complete understanding forward to our careful examination of the changing Arctic.

Tim Kenna captures himself in the field surrounded by Arctic sea ice. (photo credit Tim Kenna)

Tim Kenna captures himself in the field surrounded by Arctic sea ice.

Margie Turrin is blogging for Tim Kenna, who is reporting from the field as part of the Arctic GEOTRACES, a National Science Foundation-funded project.

For more on the GEOTRACES program, visit the website here.

First to arrive and last to leave…

Sugar - Sun, 08/23/2015 - 18:17
It is hard to believe that just a few days ago, the hotel had 30+ college students
roaming the hallways and the parking lot was full of SUV’s washed in clay, sand and
mud. When most of the second phase of the SUGAR project had come to a halt, there
was still work to be completed by the Seismic Source Team (SST). In order to
understand why, let me take you through the work schedule of the SST.
Dr. Harder and I drove to Atlanta on July 1st after completion of the ENAM
project in North Carolina and began scouting the shot-holes we would need to drill, load
and stem i.e. fill before the shot dates, which were scheduled for August 7th and 8th for
Line 2 and August 14th for Line 3. When scouting, you want to ensure that the shot-hole
locations selected have good, accessible roads and enough space for the drillers as well as
work crew to move in and out of easily. However beforehand, you want to ensure that
you have the permits to access different properties and have the correct keys for the
property entrance/exit gates, which Donna took care of. Scouting holes took 4 days
before drilling began on July 7th until July 29th.
An example of a good, accessible road for the drillers and SST to use.Pick a lock, any lock. One of the entrance/exit gates to a shot location. Thankfully, we
had the key. I just had to test it on each lock to open the gate. A typical workday would consist of waking up at 6:30 am, eating breakfast at 7
am and leaving to work at 7:30/8 am. We would arrive on site about an hour later and the
drillers would set up and begin drilling. This would take about 2-3 hours at some holes
and 3-4 hours at others. The last hole composed of hard rock took about 14 hours to
complete. That does not include the time it took for us to stem the hole. We would
prepare the charges to load into the hole when the drillers had ~20 ft left to drill. They
drilled up to ~80 ft at the 2 shot-holes on the ends of Line 2 and ~70 ft for the remaining
13 shot-holes. For Line 3, they drilled all 11 holes to ~60 ft. After drilling and loading
the charges into the ground, Dr. Harder would lead the drillers to the next shot-hole while
Galen, Yogi and I would stay behind to stem the hole with gravel, sand and plug it with
bentonite. We would also check the detonators to make sure they worked before heading
off to the next shot-hole to repeat the process. On average, we would drive anywhere
from 100 – 200 miles per day depending on what we were doing and where we needed to
go.
Yogi (Victor Avila, left) and Galen preparing 2  charges to be lowered into the shot-hole.
Each charge contains 2 detonators attached  to 2 boosters indicated by the sets of wires.The drillers lowering the charge into the hole with Yogi carefully holding the detonator (orange wire) chords.
On the left is the water truck and to the right is the drill rig."The Beast" with a 1.1 Explosives placard after transporting the source materials to the shot location.Galen taking a GPS waypoint of the loaded shot-hole while Ashley tests the detonators to ensure that they are working.Dr. Harder (left) and Kent splicing the wires at one of the shot-holes to connect the detonators in order to shoot. The routine changed once drilling was complete. We made our way to Vidalia
where we met with Donna, Dan and everyone at the instruments center and began
preparing our equipment for the nights we were going to shoot. Shots would start at 11
pm and last until as late/early as sunrise depending on the weather conditions as well as if
the detonators would connect. The days that the deployment team members were
flagging and deploying instruments, we were busy driving to shot-holes and cleaning the
ones that blew out. The idea is that you make the shot-hole location look the way it did
before the shot took place.
Shot-hole 7 on Line 3. It looks like a regular hole, but it is actually about 5ft deep and has a 5ft diameter cavity.Using the backhoe to clean up the above shot-hole.After clean up!!I can honestly say there was never a dull moment while working on the SST. I
remember Donna saying at our farewell dinner something along the lines, “We do all this
work for just a disk of data, but it’s all worth it.” She could not have summed it up any
better than that.

Here’s to another successful project….salud!

Ashley Nauer - UTEP

Tracing the Arctic

TRACES of Change in the Arctic - Wed, 08/19/2015 - 00:07
Leaving Dutch Harbor

The U.S. Coast Guard cutter Healy leaving Dutch Harbor, Alaska, and heading to the high Arctic for the GEOTRACES research cruise. It doesn’t take long to move from a landscape of steep carved cliffs to one of endless waves on an Arctic passage. Photo: T. Kenna

Dutch Harbor Alaska is located on that long spit of land that forms the Aleutian Islands of Western Alaska. Research vessels launch from this location and head northeast into the Bering Sea on their way to the Bering Strait, the gateway to the Arctic.

map of Dutch Harbor

Dutch Harbor, Alaska (from http://www.vacationstogo.com)

Our research cruise is part of the international Arctic GEOTRACES program, which this summer has three separate ships in the Arctic Ocean. The Canadian vessel headed north in early July, and the German vessel will follow a week behind the Healy. Each will be following a different transect in the Arctic Ocean to collect samples. The U.S. vessel has 51 scientists on board, each with a specific sampling program. We will focus our time in the western Arctic, entering at the Chukchi Sea. (Follow the expedition here.)

What is GEOTRACES studying? The program goal is to improve our understanding of ocean chemistry through sampling different trace elements in the ocean waters. Trace elements can be an asset or a liability in the marine system, providing either essential nutrients for biologic productivity, or toxic inputs to a rapidly warming system. This part of the larger program is focused on the Arctic Ocean, the smallest and shallowest of the world’s oceans and the most under siege from climate change. Results from this cruise will contribute to our understanding of the processes at work in the Arctic Ocean, providing both a baseline of contaminants for future comparisons as well as insights into what might be in store for our future.

The land surrounding the Arctic Ocean is like a set of cradling arms, holding the ocean and the sea ice in a circular grasp. Within that cradle is a unique mix of waters, including freshwater from melting glacial ice and large rivers, and a salty mix of relatively warm Atlantic water and cooler Pacific water. Our first sample station lasts over 24 hours and focuses on characterizing the chemistry of the water flowing into the Arctic from the Pacific Ocean. This is critical for locking down  the fluxes and totals of numerous elements in the Arctic.

Map of sea ice

Daily map from the ship showing sea ice cover. Yellow is the marginal ice, and the red is heavy ice. The location of the Healy is visible at the lower edge of the photo at the edge of the red dot.

In the past the “embrace” of the Arctic land has served as a barrier, holding in the sea ice, which is an important feature in the Arctic ecosystem. In 2007, however,  winds drove large blocks of sea ice down the Fram Stait and out of Arctic. In recent years the Arctic sea ice has suffered additional decline, focusing new attention on the resource potential of this ocean.

Unexpectedly this year, the sea ice is projected to be thick along the proposed cruise track, thick enough that it might cause the ship to adjust her sampling plan.

Walrus

Walrus resting on Arctic sea ice. Photo: T. Kenna

The walrus in the above image are taking advantage of the Arctic sea ice. Walrus use the ice to haul out of the water, rest and float to new locations for foraging. Walrus food of preference is mollusks, and they need a lot of them to keep themselves satisfied, eating up to 5,000 a day, using the sea ice as a diving platform. As the ship moves further from shore, we will lose their company.

Margie Turrin is blogging for Tim Kenna, who is reporting from the field as part of the Arctic GEOTRACES, a National Science Foundation-funded project.

For more on the GEOTRACES program, visit the website here.

Pages

 

Subscribe to Lamont-Doherty Earth Observatory aggregator