News aggregator

January El Niño Update: It’s Got a Lot Going On - NOAA

Featured News - Thu, 01/14/2016 - 10:41
Lamont's Adam Sobel discusses connections between the Madden-Julian Oscillation (MJO) and this year's El Nino.

'Internet on the Seafloor' Helps Scientists Find Underwater Volcanic Eruptions - Business Insider

Featured News - Wed, 01/13/2016 - 14:02
The system of sensors will allow scientists to study how the Earth continually sculpts itself. Lamont's Maya Tolstoy, who studies underwater volcanoes, describes its value to science.

Monster Tsunami May Have Created Madagascar's Giant Sand Dunes - Live Science

Featured News - Wed, 01/13/2016 - 12:00
Sometime in the past 8,000 years, a meteor may have hit the Indian Ocean, triggering a monster tsunami that struck Africa, new research from Lamont's Dallas Abbott suggests.

The 40,000-Mile Volcano - New York Times

Featured News - Tue, 01/12/2016 - 09:20
Scientists have inaugurated a major new effort to study the volcanic structures at mid-ocean ridges. Off the West Coast, they have wired up a highly active ridge with hundreds of sensors and cameras. Lamont's Maya Tolstoy discusses the project and what scientists are learning about seafloor volcanism.

Aerosols, Land-Use Changes and the Weakening Monsoon - The Hindu

Featured News - Sat, 01/09/2016 - 12:00
The South Asian Monsoon has been weakening since the 1950s with an increased incidence of extreme rainfall events. The Hindu talks with Lamont's Deepti Singh about the causes.

How El Niño Is Impacting California’s Wine Industry - Vox Media

Featured News - Wed, 01/06/2016 - 12:00
Lamont's Kyle Frischkorn and Logan Brenner write about the impact of El Niño's rains on California's vintages.

North Korea Blast: Seismic Signals for Hydrogen Should Be Bigger - CNBC

Featured News - Wed, 01/06/2016 - 12:00
The North Korean government announced a successful test of a hydrogen bomb, but some seismologists question the size of the blast. CNBC speaks with Lamont's Paul Richards and Won-Young Kim, director of the Lamont-Doherty Cooperative Seismographic Network.

How Scientists Know the North Korea Blast Probably Wasn't an H-Bomb - Bloomberg

Featured News - Wed, 01/06/2016 - 12:00
An actual hydrogen bomb has a seismic signature similar to an atomic weapon's, but its explosive yield is much larger, the report says. Bloomberg speaks with Lamont-Doherty seismologist Won-Young Kim, director of the Lamont-Doherty Cooperative Seismographic Network.

Arctic Outbreak Barreling Toward U.S. May Be Storm Frank's Revenge - Mashable

Featured News - Mon, 01/04/2016 - 12:00
For most of the U.S., the weather through mid-January will be the polar opposite of what it was in December. To what do we owe this reversal of atmospheric fortune? Andrew Freedman talks to Lamont's Richard Seager and other scientists.

Earthquake Shakes Parts of New Jersey & New York - Journal News

Featured News - Sat, 01/02/2016 - 12:00
A 2.1 earthquake struck northern New Jersey early Saturday. Lamont-Doherty's Leonardo Seeber spoke with the Journal News about it.

Above-Freezing North Pole Caps Year of Arctic Extremes - VOA

Featured News - Thu, 12/31/2015 - 12:00
While the average global temperature has risen 1 degree Celsius since pre-industrial times, the Arctic is up 3 degrees. "The Arctic is warming much faster than we thought it would. And it's warming even faster than most of our models predict it will,” said Lamont's Bob Newton.

All I Wanted for Christmas Was for These Pumps to Work

Sampling the Barren Sea - Wed, 12/30/2015 - 08:58
The cruise track and sampling stations for the FS Sonne.

The cruise track and sampling stations for the FS Sonne.

By Frankie Pavia

We’ve just completed our first full station and are remarkably pleased with the results. We collected 8 seawater samples to measure helium isotopes; 20 to measure thorium and protactinium isotopes; 7 in-situ pump filters to measure particulate thorium and protactinium isotopes; 6 manganese oxides cartridges that were attached to the pumps to measure actinium and radium isotopes; and 1 box core of the ocean floor to measure sedimentary thorium and protactinium isotopes. I was going to make this paragraph into the Twelve Days of Christmas song, but 7 pumps-a-pumping doesn’t really roll off the tongue that well.

pump

A pump destined for the deep.

What all this means is that the first station was a smashing success for us. The only thing that didn’t quite go as planned was the nine-meter-long gravity corer coming up empty. We suspect it may have been due to the corer not being able to penetrate the hard carbonate layer we saw–about 15 centimeters thick in our box core. Nonetheless, we are delighted.

We were especially pleased that our in-situ pumps worked. We arrived on the cruise with the knowledge that the pumps would be there, but figured that somebody would be an expert on how to program them, maintain them and operate them. The pumps are essentially motors hung on a line deep in the water, drawing thousands of liters water through a filter, catching the ocean’s suspended particles.

After a week of poring over the manual, we were finally ready to deploy the pumps. It would take them 2.5 hours to descend to 3600 meters water depth, 6 hours of pumping, and 2.5 hours for the deepest pump to return. A convenient time to have them pump is overnight. Sleep is hard to come by while on station, so six hours of pumps pumping away at depth is a great excuse to scuttle off to bed.

We were pretty nervous as to whether they would actually work. We had invested a lot of time and energy getting them up and running. What a bummer it’d be if they spent six hours in the deep ocean not doing anything because I had accidentally programmed them to pump at the wrong time, or something. Our test run the previous day had been a bit spotty, too. The flow rate of the pumps had been something like 3 times lower than it should have been.

We woke up at 4 a.m. the next day to wait for the pumps to arrive back on deck, driven by caffeine and nervous energy. Christmas had been two days previous. On Christmas Eve the crew put on a terrific party in the hangar, and the pumps had been decorated with big red ribbons. We were about to find out whether the pumps were a present we actually wanted, or if they were one of those fancy battery-powered toys you get with a list of parts that has three missing and ends up never working.

All the pumps have names. We were able to name the four new pumps after ourselves, while the other four pumps already names. Claudia, Bernhard, Sebastian, Frankie, Laura, Frauke, Jimmy and Hulda. They all seemed to have a little personality too – especially the old ones, Laura, Frauke, Jimmy, and Hulda. Parts of Laura were backwards, Hulda’s screws refused to come loose, Jimmy’s pump head had missing pieces.

Claudia was the first to arrive at the surface. Immediately upon getting her out of the water, we put a shower cap over the filter holder to protect the filter from contamination by atmospheric aerosols and any dust floating around the hangar. We pumped the remaining water from the bottom through the filter, removed the filter holder and brought it to the lab. We carefully unscrewed the top, opened it up, and…

The filter was covered in particles! One by one, the pumps came up with filters that were coated by an even distribution of particles. Everything worked perfectly. Even Laura, Hulda, and Jimmy, though they were stubborn above water, did everything they were supposed to do once they were submerged.

We plan to measure protactinium and thorium isotopes on the particles to learn about the kinetics of particle movement in the ocean – sinking rates, absorption coefficients for trace metals, and export fluxes. Particles are the vectors that move elements out of the surface ocean, so studying their characteristics will be crucial for understanding how things like carbon and iron are pumped and exported to the deep.

Functional pumps meant that it was a happy Christmas for us. The next full station starts this afternoon. We’ll spend 42 hours sitting in one place, measuring dissolved, particulate, and sediment samples. Yesterday we had to change all the batteries on the pumps. Each pump requires 24 D batteries per deployment, and uses them all. So for every cast of 8 pumps, we use 192 D batteries. We’ll send the pumps out tonight and retrieve them at 4 a.m. again tomorrow morning.

We’re hoping these pumps are gifts that keep on giving.

Arsenic Contaminates India's Drinking Water - Scientific American

Featured News - Tue, 12/29/2015 - 09:37
In this video, Lamont-Doherty's Lex van Geen discusses how agriculture and irrigation are changing underground water flows, rerouting them through contaminated ground.

Why the Freakishly Warm December? - CNN

Featured News - Fri, 12/25/2015 - 12:00
Every weather event, this one included, has multiple factors that conspire to make it what it is, writes Lamont-Doherty's Adam Sobel.

The Far North Is Melting. Will We Ever Bring It Back? - National Geographic

Featured News - Wed, 12/23/2015 - 12:00
The basic message is that we will be able to bring the ice back as long as we bring the planet’s temperature down, says Lamont-Doherty oceanographer Stephanie Pfirman.

Wrapping up the season

Chasing Microbes in Antarctica - Wed, 12/23/2015 - 09:34
One of many large chains of Chaeotoceros now blooming in Arthur Harbor.

One of many large chains of the diatom Chaeotoceros now blooming in Arthur Harbor.

Yesterday morning the Gould returned to Palmer Station, which means that it’s time for Jamie and I to take off. I’m looking forward to getting home and working through all the data we’ve collected (and who wouldn’t want to spend Christmas sick in the Drake Passage?), but sad to be leaving at an ecologically interesting point in the season. After a particularly windy spring we’ve had a week of calm conditions. As expected this resulted in a huge increase in primary production. The water at our regular sampling stations has turned green almost overnight. In an ideal world we would have seen those conditions two weeks ago, at the height of our sampling, but there’s no predicting the timing of these events! Consistent with what we’ve seen in the minor blooms all season this major bloom is composed mostly of Chaeotoceros. Instead of short chains however, we’ve got dense chains of many tens of cells. If these calm conditions persist a little longer it bodes well for the krill (and everything else) this season. To keep track of what the Palmer LTER group is up to for the remainder of the season you can check out Nicole Couto’s blog here.

All in all it was an extremely busy and productive early season.  Many thanks to everyone at Palmer Station for making it happen!

A new species of penguin clusters at the ice edge.

Celebrating the summer solstice: a new species of penguin clusters along the shoreline near Palmer Station.

Massive Landslide Detected in Alaska - ABC News

Featured News - Tue, 12/22/2015 - 15:00
Lamont-Doherty seismologists Colin Stark and Goran Ekstrom have discovered a massive landslide in an uninhabited area of eastern Alaska that's the largest detected in North America since the 1980 collapse at Mount St. Helens.

Scientists Debate Evidence of Ancient Megatsunami - National Geographic

Featured News - Tue, 12/22/2015 - 13:27
Lamont geologist Dallas Abbott presents evidence suggesting that an enormous space rock, possibly an asteroid, smashed into the Indian Ocean about 10,000 years ago and created a megatsunami that washed over the east coast of Africa.

Doing Science When There’s No Science to Be Done

Sampling the Barren Sea - Tue, 12/22/2015 - 13:16

By Frankie Pavia

Six days after we were supposed to have departed, the UltraPac scientists and ship’s crew remain stranded at port aboard the FS Sonne. Containers with the last of our missing science gear are on a truck driving up from San Antonio, Chile, where the port felt comfortable unloading our acids and radioisotopes. The Sonne’s spare parts are being unloaded from a ship across the harbor that I can see from my cabin’s windows. With an abundance of time and a dearth of work, we have begun to devise ways of doing science before we can actually do science at sea.

pavia desk

Setup for photographing particle filters, devised in port.

We first discussed how to optimize our sample depth selections. In the first three stations, the deep waters will be downwind of the East Pacific Rise, one of the fastest spreading mid-ocean ridges in the world. At ridge axes, water that has percolated through the ocean crust and weathered mantle-derived rocks is erupted back out by volcanism and hydrothermal vents. This ‘plume water’ bears a distinct signature of the Earth’s mantle – high in rare noble gases like 3He, biologically critical trace metals like iron and manganese, and small particles that are reactive sites for removing other elements like phosphorous, magnesium, and most importantly (for me!), protactinium and thorium.

When this plume water enters the ocean, it is very hot and less dense than the surrounding waters. It rises until it attains a state of neutral buoyancy – when its density is the same as ambient seawater. Then it simply moves and acts like any other water – in currents and eddies. But since it bears distinct chemical signatures, chemical oceanographers can find easily find it – after they’ve measured something in it.

But we want to know where it is before we sample it. We want to understand the processes going on inside the plume. What kind of particles are there? How fast do they remove trace metals from the ocean? How much iron enters the ocean from submarine volcanism? If we are to answer these questions, we must first be able to sample exactly within the plume waters – which means we must know where they are before we deploy our bottles.

Luckily, past cruises from the World Ocean Circulation Experiment (WOCE) have measured helium isotopes and density in the Pacific before. As a result, we know roughly what density surface is associated with the neutrally-buoyant plume waters. When we sample, we will send down a line with a CTD sensor to measure temperature, salinity, and pressure, from which we can calculate density. That line will have our bottles on it. We can instantaneously calculate the density of the waters we are sampling, find the depth of the density surface we know is associated with plume waters, then tell our bottles to open and sample at that depth. Problem solved!

We also set up an imaging system to take pictures of the particle filters we bring back. At seven depths of each station, we will deploy in-situ pumps that filter thousands of liters of seawater through a filter at a given depth. We then haul the pumps back to the surface, remove the filters, and analyze them.

We would like to photograph the filters before we analyze them so we can visually assess how much material there is on each filter, to confirm the results from our chemistry. To do this accurately, we must photograph every filter from the same angle, with the same lighting, with the same shutter speed. We went to a hardware store in town yesterday and bought some supplies, not knowing if the imagined setup would actually work.

It worked! We turned a lamp with a flexible stand for adjusting light height into a camera holder, decapitating the lamp portion and replacing it with a tripod holding the camera. Then we installed software allowing the camera to be controlled from a phone, so we could take pictures and adjust shutter speed remotely. We bought a clip-on lamp that will be attached to the camera holder for constant lighting (this one used for its true purpose!).

We are finally scheduled to receive our last missing container and depart port late tonight, around 22:00. While the delay has been frustrating, I suppose it hasn’t been all bad. We were scheduled to leave December 17, the day before the new Star Wars movie came out. Six extra days in port meant we were able to go into town to watch it. It was our last little leisure activity on land. Now it’s time for the ocean.

The Best of Climate Science and Humanity Come Together at AGU - Guardian

Featured News - Mon, 12/21/2015 - 15:00
More than 20,000 scientists shared their research at the fall AGU conference. Among them, Richard Seager’s team estimated that global warming has intensified the California drought by about 20 percent.

Pages

 

Subscribe to Lamont-Doherty Earth Observatory aggregator