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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.

Day 2: What Am I Doing Here, Anyway?

Sampling the Barren Sea - Mon, 12/21/2015 - 10:03
The planned cruise track of the FS Sonne. The stars are stations that will be sampled during the UltraPac cruise. In color is the bathymetry of the seafloor.

The planned cruise track of the FS Sonne. The stars are stations that will be sampled during the UltraPac cruise. In color is the bathymetry of the seafloor.

By Frankie Pavia

Still stuck in Antofagasta, the scientists are becomingly increasingly antsy. Every day we are stuck at the port is a day of sampling we won’t be able to do at sea. Every time we want to take a sample from the bottom of the ocean, at around 5,000 meters depth (16,404 feet), it will take us four hours to lower the line, several hours to do sampling (fill bottles, pumps, etc), and four hours to pull it back up. There are several of these casts at each of eight stations. Every hour we have at sea is precious for returning valuable samples.

What am I doing here, anyway? I am an oceanographer and an isotope geochemist. Originally, I only planned to measure naturally occurring radionuclides thorium and protactinium dissolved in seawater and stuck onto ocean particles. But slowly, more scientists found out there was a chance to get seawater from this part of the ocean and asked us to take samples for them.

The South Pacific Gyre is the most oligotrophic (nutrient-poor) region in the ocean. This makes it largely barren of life and matter—the waters are the clearest in the ocean. The sediments accumulate below the water at rates as low as 0.1 millimeter per thousand years. So, 10 centimeters of seafloor are equivalent to one million years of material deposition in the South Pacific.

The scarcity of particles and lack of eukaryotic life are two major reasons the South Pacific is fascinating to a chemical oceanographer.

Surface biology and dust deposition are the two main factors regulating the flux of particles through the ocean interior. Being so far from land and upwind of major dust sources, almost no atmospheric material makes its way to the South Pacific. Since there is no dust, and no eukaryotes, the particles must largely be made up of tiny bacteria, of which there are millions in each milliliter of seawater.

 Frankie Pavia

Jellyfish floating near the boat. Photo: Frankie Pavia

Much of what we are setting out to do is simply the chemical characterization of the region. We are exploring the ocean using chemistry. We can’t see the scarce sinking particles, but trusty old thorium and protactinium can. They are extremely insoluble. Every time they encounter a particle, they stick to it. We exploit this simple characteristic to provide rare accounts of rates in the ocean. Just by measuring protactinium and thorium, we can calculate how fast particles are sinking through the water, how much dust is entering the water column, how fast different elements are being removed from the water at the seafloor, and more. It’s almost incomprehensible that two obscure elements can teach us so much.

These isotopes are the oceanographer’s equivalent to the Hubble telescope.
They help us see where we cannot. We measure thorium and protactinium to tell us input and removal rates. We measure helium isotopes to trace hydrothermal plumes in the deep ocean. We measure radium and actinium isotopes to determine the mixing rates of waters in the deep ocean. None of these processes are discernable by eye, yet all are crucial for understanding the chemical and physical state of the entire ocean.

So we continue to wait to make our measurements and do our science until we can depart. The void is filled by lighthearted scientific arguments, whether or not we could make a jetpack for one of the massive hordes of dead jellyfish floating around the boat. The idea is that you could throw a bit of dry ice underneath the jellyfish, which would then sublimate, expand, and rise out of the water, taking the jellyfish with it.

Ultimately, no one ever tried it. Who wants to do an experiment where you can just see the answer with your own eyes?

Frankie Pavia is a second-year graduate student studying oceanography and geochemistry at Lamont-Doherty Earth Observatory.

Climate Change Education With New Card Game - Live Science

Featured News - Sun, 12/20/2015 - 12:00
Lamont-Doherty scientist Stephanie Pfirman helped to develop a game called EcoChains to teach children about our changing planet. She explains how it's played.

Alaska Landslide Was Among World's Biggest in Recent Years - Alaska Dispatch

Featured News - Fri, 12/18/2015 - 15:00
When 200 million metric tons of rock tumbled down a remote Southeast Alaska mountain in October, nobody was around to see it. Across the country, Lamont-Doherty seismologiests Colin Stark and Goran Ekstrom were able to pinpoint location, direction and size.

More Rain, Less Snow in Future El Niños - ABC

Featured News - Fri, 12/18/2015 - 12:00
Lamont-Doherty's Richard Seager says if this El Niño is similar to 1997-98, be prepared for dry conditions following. With warming temperatures, future El Niño will look much different, he says.

Setting Sail? Plan for the Unexpected

Sampling the Barren Sea - Fri, 12/18/2015 - 10:32
 Frankie Pavia

Stepping aboard. Photo: Frankie Pavia

By Frankie Pavia

Days -3 to 1, The delay: In the weeks before departing for my first scientific cruise, everyone I knew who had ever been to sea gave me some form of the same advice:
Nothing ever works the way you expect it to work at sea. Four days ago, their words lingered heavily in my head as I groggily walked to board my final connection to Antofagasta, Chile. I wondered to myself, “How can the unexpected happen when I have no idea what to expect in the first place?”

I am typing from my cabin aboard the FS Sonne, a German research vessel scheduled to depart on a scientific sampling cruise between Antofagasta, Chile, and Wellington, New Zealand, crossing the entire South Pacific, between Dec. 17 and Jan. 28. Fellow Lamont-Doherty graduate student Sebastian Vivancos and I will be measuring a variety of chemical tracers in the ocean for our Ph.D. theses on the cruise. The South Pacific is a bit of a unicorn for oceanographers—due to its remoteness, cruises rarely go there, making it hard to get samples. We were presented with the opportunity to collect seawater aboard the FS Sonne as part of the UltraPac program and jumped at the chance.

We arrived three days ago to load the ship, with the help our lab’s research technician and scientific cruise guru, Marty Fleisher. The expectation was that we would stay in a nearby hotel on the 14th and 15th, set up the ship, and on the 16th we would have everything ready to go, stay the night aboard the Sonne, and depart the next morning.

The answer to my first question was answered almost immediately. One of the bags filled with crucial last-minute additions to our sampling equipment was lost in transit by the airline company. After a massive series of calls emails, we had a tracking number, but no idea if the bag would arrive by the morning of the 17th when we would depart. Some of the things we could buy at a local hardware store, but some of it was likely too specialized. I, for one, have never seen a hardware store that sells pizza slicers made of ceramic.

 Frankie Pavia

Sitting by the dock of the bay: the FS Sonne. Photo: Frankie Pavia

Once again the unexpected struck. Upon meeting with the other scientists on the cruise, we quickly learned that everyone was missing their supplies. Everyone else’s supplies were scheduled to arrive on the 18th—the day after the cruise was scheduled to depart. Then the bombshell: spare parts for the ship were still at least four days away from arriving, and we couldn’t depart until we had them.

The presence of the unexpected was forcing me to realize what my expectations were in the first place. I had been incredibly anxious leading up to the cruise about leaving my life behind for two months while I went to sea with limited connection to the outside world. I was hoping that the solitude of the ocean and the engagement of constant scientific work would buffer that anxiety. The going is slow. There’s not much work to do until the parts get here and we depart. I’m living on the ship, but my journey hasn’t yet begun.

The best-case scenario is that we leave on Sunday. No one has said anything about the worst-case scenario yet, but there have been rumblings of a Christmas in Chile. That leaves somewhere between three more days and seven more days of the uncertain, and the unexpected grasping my life’s puppet strings, postponing the adventure.

Ice Rafts Traveling Farther, Faster across the Arctic Ocean - Science

Featured News - Thu, 12/17/2015 - 15:00
Climate change may be causing Arctic sea ice to travel farther and faster than it did 15 years ago, taking pollutants and other material along for the ride. Lamont-Doherty's Bob Newton described the changes at the American Geophysical Union 2015 meeting.

The Ominous Story of Syria's Climate Refugees - Scientific American

Featured News - Thu, 12/17/2015 - 11:39
Farmers who have escaped the battle-torn nation explain how drought and government abuse have driven social violence. Lamont-Doherty's Richard Seager discusses the climate connection.

Listen in: Sachs & Cohen on the Paris Agreement

The 2015 Paris Climate Summit - Wed, 12/16/2015 - 13:33
Jeffrey Sachs

Jeffrey Sachs

Earth Institute Director Jeffrey Sachs sat down with Brian Lehrer at WNYC on Tuesday to talk about what happens post-Paris. The climate talks are over, but the real work is just beginning. Sachs talks about the details of the agreement, what the implications are, and what obstacles we face moving forward on climate change.

Listen to the interview here.

Executive Director Steve Cohen was on WNYC on Monday talking with Soterios Johnson about the implications of the Paris accord on New York City. You can hear that interview here.

Restoring White Arctic Will Fall to Future Generations Who Never Knew It - AGU

Featured News - Wed, 12/16/2015 - 01:34
Scientists and policymakers have discussed for decades how to slow the rate of global warming and melting Arctic ice, but few have discussed how to restore the ice after it is lost. Cites a new analysis by Lamont's Robert Newton and Stephanie Pfirman.

Understanding the Paris Climate Accord and Its Implications

The 2015 Paris Climate Summit - Tue, 12/15/2015 - 17:14
The climate agreement is adopted.

The climate agreement is adopted.

On Saturday, Dec. 12, 2015, 195 countries reached a history-making agreement to reduce their greenhouse gas emissions in order to avert the direst effects of climate change. The groundbreaking pact requires that nearly every country, large and small, developed or developing, take action.

Here are some of the best and most reliable resources to help you understand the Paris accord and its implications.

The COP21 official site asserts that the rise in global temperature must be kept under 2˚C compared to pre-industrial levels to avoid the most catastrophic effects of climate change, and, establishes for the first time the aim to keep the temperature below 1.5˚ to protect island countries, which are most vulnerable to the risks of sea level rise.

The United Nations Framework Convention on Climate Change newsroom explained that the climate agreement encompasses mitigation, the effort to reduce emissions quickly enough to reach the temperature goal; a transparent and global stock-taking system to monitor progress; adaptation, to help countries deal with the impacts of climate change; loss and damage, to aid countries recovering from the impacts of climate change; and financial and technical support to help nations build sustainable resiliency.

To curb the temperature rise, countries submitted “nationally determined contributions” that indicate how much they will reduce their emissions and what actions they will take to do so, but these are not legally binding. The New York Times said that countries are legally bound by the agreement, however, to monitor and report on their emissions and progress, and ratchet up their efforts to reduce emissions in the future.

The climate pledges that have been made thus far will not cut emissions enough to keep below the 2˚ target, so beginning in 2018, countries must submit new plans every five years that increase their emissions reductions, reported CNN. There is, however, no mechanism to punish any country that violates its commitment.

The New York Times examined some salient points of the agreement. The aspiration to stay below 1.5˚ C as part of the 2˚ limit makes this temperature increase target more ambitious than those in the past. Forests must be preserved with incentives continued to reduce deforestation and forest degradation that increase emissions. A transparent system will be established to evaluate implementation of the countries’ nationally determined contributions; and countries must come up with increasingly ambitious reduction targets every five years. The parties are encouraged to reach a peak of greenhouse gas emissions as soon as possible. The agreement also recognizes loss and damage resulting from climate change impacts. And while the agreement does not set forth a specific dollar amount, the developed countries are encouraged to provide and marshal financing from various sources to help developing countries.

Developed countries agreed to continue their commitment to provide $100 billion a year from 2020 until 2025, after which financing will increase. However the $100 billion figure does not appear in the legally binding part of the agreement .

National Geographic took a look at some of the surprises, as well as the winners and losers of the climate agreement.

The International Energy Agency estimated that fulfilling all the climate pledges would entail investments of $13.5 trillion in energy efficiency and low-carbon technologies between 2015 and 2030. If $3 trillion more were invested, the temperature increase could be held to 2˚ C. While $16.5 trillion sounds like a huge sum, the world is projected to spend $68 trillion anyway by 2040 on energy systems. The climate agreement ensures that the investments will go towards low-carbon technologies.

Each country will decide how best to fulfill its climate pledge. The Deep Decarbonization Pathways Project, an initiative of the Sustainable Development Solutions Network, has put together research teams from the world’s biggest greenhouse gas emitting countries that are developing concrete and detailed strategies for reducing emissions in their countries.

The World Resources Institute’s analysis of the accord said that it presents a new model of international cooperation where developed and developing countries are united and engaged in a common goal. The agreement also signals the recognition that acting to stem climate change can provide tremendous opportunities and benefits.

The accord will be open for signature at the United Nations headquarters in New York City from April 22, 2016 to April 21, 2017, with a high-level signature ceremony on April 22, 2016. It will be in force once it has been ratified by 55 countries, representing at least 55 percent of emissions.

Secretary of State Kerry addresses the country delegates after adoption of the agreement

Secretary of State John Kerry addresses the country delegates after adoption of the agreement


Around the world, countries hailed the accord, while most newspaper editorial boards cheered the historic agreement and praised their own countries’ negotiators.

The Los Angeles Times questioned whether the countries of the world could truly work together to stay within the 2˚ target and if even the aspirational 1.5˚ goal was low enough to save us from catastrophic impacts, but called it a “good moment for the planet.”

The Washington Post said that the agreement will challenge climate deniers to “explain not only why they reject science but also why they would harm the U.S. standing in the world by seeking to slow the progress so many countries are making.”

The Wall Street Journal asserted that the accord would make the world poorer and slow technological progress. It is betting that the agreement will not make an impact on global temperatures because the commitments to reduce emissions are not legally binding.

Many businesses, such as Coca-Cola, DuPont, General Mills, HP and Unilever are supportive of the agreement, recognizing that the policies developed in accord with the Paris agreement would bring more certainty to investors and generate business opportunities, reported The New York Times. The climate agreement sends a strong signal to businesses and investors that the fossil fuel era is on its way out.

Over 100 corporations pledged to reduce their carbon emissions in the effort to support the climate agreement’s 2˚ target. InsideClimate News reported that companies like Wal-Mart, IKEA, Honda, Unilever and Xerox are participating in the new initiative organized by the World Resources Institute, World Wildlife Fund, Carbon Disclosure Project and the UN Global Compact.

Reuters provided a sampling of reactions by prominent political and business leaders around the world.

Paul Krugman, Nobel Prize-winning economist and New York Times op-ed columnist, said that despite the challenges that still exist, there is reason to believe the agreement can change the world’s trajectory because the costs of renewable energy have fallen so dramatically. This means reducing emissions will cost much less than was previously assumed.

Michael Mann, climatologist, geophysicist and Distinguished Professor of Meteorology at Pennsylvania State University, said, “One cannot understate the importance of the agreement arrived at in Paris. For the first time, world leaders have faced up to the stark warnings that climate scientists have been issuing for years instead of shrinking away with denial and delay.”

Bill McKibben, the founder of, the global climate campaign, called the climate pledges “modest.” While they might have kept the planet at 1.5˚ back in 1995 when the first climate conference occurred, he said, now we need to proceed at breakneck speed, leaving most of the remaining fossil fuels in the ground and transitioning to renewable energy as soon as possible.

James Hansen, former NASA scientist and leading climate scientist, called the agreement a “fraud” and “a fake.” Without a mechanism, such as a carbon tax, to drive up the cost of fossil fuels, he said, they will continue to be the cheapest fuels available and continue to be burned.

Representative Lamar Smith, R-Texas, chairman of the House Science, Space and Technology Committee, contended the Paris climate accord will slow economic growth in the U.S., raise electricity bills and have little impact on the environment. He believes the answer lies in relying on technological advances.

According to a 2014 report, climate denialism is more prevalent in the United States than in any other country in the world.

Many Republicans have vowed to fight President Obama’s climate agenda, The Wall Street Journal reported. Moreover, most of the Republican presidential candidates if elected, would work to undo Obama’s executive actions to deal with climate change. Because of the way the climate agreement is structured, however, it does not need to be approved by Congress.

Meanwhile, Bill Gates and other tech leaders such as Mark Zuckerberg, Richard Branson, Jeff Bezos and Jack Ma have established the Breakthrough Energy Coalition, committing billions of dollars to invest in early stage, high-risk, breakthrough energy companies because the world needs reliable, affordable, clean energy. They will also invest in Mission Innovation, a consortium of 20 countries, including the U.S., that have pledged to double their investment in clean energy over the next five years.


The Paris climate agreement is momentous and historic because the countries of the world have been struggling to deal with climate change for over 20 years. In 1992, numerous countries first joined an international treaty, the United Nations Framework Convention on Climate Change, to figure out how they could limit global temperature increases and cope with the impacts of climate change. Here is the history of earlier attempts to negotiate an effective agreement to deal with climate change.



A standing ovation for the acceptance of the Paris accord 

President Obama announces the historic climate agreement

The World Bank Group’s president, Jim Yong Kim, on the climate agreement and its implications for business and investment:

Felipe Calderon, former president of Mexico, discusses the difference between the 2009 climate conference and COP21 with Tom Friedman, Pulitzer Prize-winning journalist

Secretary of State John Kerry talks to Tom Friedman about China’s climate progress

The meetings of COP21

A message from the world’s astronauts to COP21

New App Explores Ice & Sea Level Change through Time

American Geophysical Union Fall Meeting - Tue, 12/15/2015 - 15:39
 Sea Level

Sea level trends, 1955-2012, from the app Polar Explorer: Sea Level

Why does sea level change at different rates? How has it changed in the past? Who will be at risk from more extreme weather and sea level rise in the future? Our scientists often hear questions like these from students, government officials and the media.

To help share the answers more widely, we created a new app that lets users explore a series of maps of the planet, from the deepest trenches in the oceans to the ice at the poles. You can see how ice, the oceans, precipitation and temperatures have changed over time and listen as scientists explain what you’re seeing and why.

“We wanted to make climate data accessible and engaging to the public, for everyone from students to interested adults. The data is displayed in interactive maps with just enough guidance to support independent exploration,” said Margie Turrin, education coordinator at Lamont-Doherty Earth Observatory, who designed the free app called “Polar Explorer: Sea Level” with Bill Ryan, Robin Bell, Dave Porter and Andrew Goodwillie. She is presenting the just-released app this week at the American Geophysical Union meeting in San Francisco.

 Sea Level app

Map and explanation of Antarctica’s elevation.

Turrin leads science education programs with schools across the New York and hands-on public projects, including monitoring the health of the Hudson River Estuary. She and Ryan created the app with broad-based education in mind and have found a welcome reception from middle and high school teachers, undergraduate science instructors, and the inquisitive public. The app pulls global information from databases created by internationally respected scientific organizations, including the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the U.S. Geological Survey and the Center for Earth Science Information Network (CIESEN) at Lamont.

The app starts with the basics: How and why we study the remnants of old shore lines, what the sea floor looks like, and why the ocean is not actually flat.

It then looks more closely at how the oceans differ from region to region and how they have changed over time in temperature, salinity and sea level. It explores the role of the atmosphere and changes in temperature, radiation and rainfall over time. Flip quickly through the rainfall map month to month over the past three years, and you’ll clearly see the rain band across the tropics and time-lapse of how areas of rain change over time.

In exploring the contribution of glaciers and ice sheets to sea level rise, you can find the largest glaciers in the world and see how the Greenland and Antarctic ice sheets changed over a decade. If the Greenland Ice Sheet, which sits on land, were to completely melt, it would raise sea level by 6 to 7 meters. The app explains why and then looks at the impact.

 Sea Level

Economic risk from flooding.

Data from CIESIN and other organizations takes these scientific explanations the next step: it explores the impact of sea level rise, flooding and extreme weather on communities around the world. The app answers questions about who is vulnerable by looking at population density, low-lying coastlines and islands, and historic hurricane and cyclone tracks, and storm surges over the past 135 years. The data also maps areas of the U.S., China, and other parts of Asia that will be most vulnerable to economic losses as extreme weather increases and sea levels rise.

Sea level change is a topic that brings together complex science with both societal and economic impacts. Tying together the range of physical science interactions and matching them to the implications for human populations is important, and yet not always easy to do. The app was designed to pull together the data and putting it straight into peoples’ hands to explore and interact with.

While the dynamic data is primarily from recent decades, the app also draws in historical data to help tell the story of climate change through past centuries. It lets you compare three periods – 1700, before the Industrial Revolution; 5,000 years ago, during the mid-Holocene; and an interglacial period 125,000 years ago when temperatures were warmer than today. You can see air temperatures, sea surface temperatures, salinity, precipitation, evaporation, ice thickness and ice concentration at each point in time. You can also explore how large ice sheets in North America and Europe receded over the time span from 20,000 years ago to 5,000 years ago.

“Polar Explorer: Sea Level” works well in formal and informal education settings, but it holds lessons for everyone interested in understanding more about our planet, the climate and how and why sea level is rising, Turrin said.

The app is currently available for the ipad and an iphone version is due out in a few days. A browser version is also available for classrooms and seminars. You can download the app at

Testing the Speed of Lava: What It Says about Escape Times & Mars

American Geophysical Union Fall Meeting - Mon, 12/14/2015 - 18:45

Understanding how lava flows is critical when homes and roads are in a lava flow’s path. A community may have a day to evacuate, or its residents may have a week or more, with enough time to move what they can to safer ground.

At Columbia University’s Lamont-Doherty Earth Observatory, post-doctoral research scientist Elise Rumpf has been developing experiments to test how quickly and in what patterns lava flows over different types of material, such as sand, gravel or larger rocks. (Watch the videos below to see some of the differences.)

The experiments show that there are clear differences in velocity, which many lava flow models overlook, Rumpf explained in a talk today at the American Geophysical Union meeting in San Francisco. In the short audio clip above she describes those differences, how she and colleagues are able to simulate lava flows, and what their findings mean for communities near volcanoes.

Rumpf’s work on lava also has wider applications beyond the Earth’s surface.

By understanding how lava moves over different materials on this planet, scientists can study images and data of other planets and have a better idea of those planets’ volcanic evolution and the surfaces hidden beneath their lava flows. In the second audio clip, Rumpf explains how a behavior sometimes seen when lava flows over melting permafrost in Iceland is helping scientists understand features spotted on Mars.



Learn more about Elise Rumpf’s work with Lava in Iceland and about other work underway at Lamont-Doherty Earth Observatory.

Catch Up on the Latest in Earth Science with AGU Sessions Live Online

American Geophysical Union Fall Meeting - Mon, 12/14/2015 - 01:30

Peter Kelemen in Oman

The American Geophysical Union’s Fall Meeting opens this morning in San Francisco, where for the next week, more than 20,000 scientists will be giving presentations, joining discussions and, perhaps most importantly, meeting with collaborators to develop new research ideas and form future research teams during the largest Earth and space sciences meeting in the world.

You don’t have to be in the room to catch up on the research being presented. Several sessions, including those listed by date and time below, will be live-streamed through AGU On-Demand. We also will be tweeting from @LamontEarth, using #AGU15, and posting on Facebook to share details and related links from presentations, posters and awards throughout the week.

The presentations during the meetings will include the work of more than 100 scientists from Columbia University’s Lamont-Doherty Earth Observatory. Among them, Park Williams will be discussing his latest research on the connections between rising temperatures and the California drought; the ROSETTA-Ice and IcePod team will be sharing findings from their just-completed mapping flights over Antarctica’s Ross Ice Shelf; and Robin Bell will be convening a session on the future of Antarctic and Southern Ocean research. Marine geologist Suzanne Carbotte also will be honored as a 2015 AGU Fellow.

You can watch the following sessions involving Lamont scientists live online at AGU On-Demand (all times are Pacific Standard Time):

Monday, Dec. 14

8 a.m. – 8:45 a.m. PST – Causes of the California Drought
Richard Seager, starting at 8 a.m., and Park Williams, starting at 8:30, present their latest research on the causes of the 2011-2015 California drought and the role of anthropogenic warming. Their paper earlier this year suggested that rising global temperatures had worsened the drought by as much as 27 percent.
AGU On-Demand Channel: Extreme Events and Hazards

8 a.m. – 10 a.m. PST – Ice Sheets and Sea Level Rise During Past Warm Periods
Alessio Rovere convenes a session with a series of presentations on research into historic sea level rise and ice sheet changes in the past and what those findings tell us about the future. Maureen Raymo is a co-author of a paper being discussed about how dynamic topography could have influenced the stability of the Antarctic Ice Sheet during the Mid-Pliocene Warm period.
AGU On-Demand Channel: Earth Discovery

2:55 p.m. – 3:10 p.m. PST – Strain on the Lesser Antilles Megathrust
Belle Philibosian, in a session on tectonic evolution and earthquake risks, will be presenting her work using coral microatolls to model the underlying strain accumulation on the Lesser Antilles megathrust. Her findings contrast with recent models suggesting that little or no strain has been accumulating along the subduction zone near the Caribbean island group that includes Dominica, St. Lucia and Martinique.
AGU On-Demand Channel: Extreme Events and Hazards

Tuesday, Dec. 15

1:40 p.m. – 3:40 p.m. PST – Future-Proofing 20th Century Science Records
Kerstin Lehnert convenes a two-hour session of presentations on data management as technology changes. She also is a coauthor of a paper being presented on preserving the science legacy of the Apollo missions to the moon.
AGU On-Demand Channel: Union

Wednesday, Dec. 16

1:40 p.m. – 3:40 p.m. PST – Extreme Weather and the Changing Polar Climate
Xiaojun Yuan convenes a session on extratropical and high-latitude storms, teleconnections, extreme weather, and the changing polar climate. Karen Smith is the coauthor of paper being presented on the impact Arctic amplification could have on weather and climate in the mid-latitudes of the Northern Hemisphere.
AGU On-Demand Channel: Climate

4 p.m. – 6 p.m. PST – The Impact of Fracking on Water Quality
Beizhan Yan, with coauthors Martin Stute, Steve Chillrud and James Ross, have been analyzing ions found in water samples from gas wells in Pennsylvania, possibly related to hydraulic fracturing. Starting at 4:45 p.m., Yan presents their latest results during a session exploring environmental impacts of hydraulic fracturing.
AGU On-Demand Channel: Natural Resources

Thursday, Dec. 17

2:40 p.m. – 2:55 p.m. PST – Friction in Subduction Zones
Hannah Rabinowitz, working with Heather Savage, discusses how carbonate-rich layers of sediment can impact the frictional behavior of subduction zones.
AGU On-Demand Channel: Extreme Events and Hazards

Learn more about the work underway at Lamont-Doherty Earth Observatory.

Making sense of megafauna: The canyon hypothesis

Chasing Microbes in Antarctica - Sun, 12/13/2015 - 08:16

Earlier in the week we had our orca show, yesterday this was the view of the top of our boat ramp:

A group of elephant seals lounges at the top of the Palmer Station boat ramp.

In fact that view hasn’t changed.  From the science office I can just make out the penguin colony on Torgersen Island, and there are plenty of their flying relatives around.  Does every bay on the Antarctic Peninsula look like this?  Or is there something special about the location of Palmer Station?

The answer is a little of both.  Certainly the West Antarctic Peninsula has more marine megafauna than just about anywhere else on Earth.  My experience from the Palmer LTER cruise two years ago was that seals and penguins are fairly ubiquitous along the coast.  That is not to say that they are equally distributed however, and the site for Palmer Station was selected in part for the high concentration of animals here – perhaps most visibly the Torgersen Island penguin colony.

The bathymetery of the canyon leading into Montery Bay.

The bathymetery of Monterey Canyon, terminating at the Salinas River at the head of the bay.  Image from the website of the Naval Postgraduate School at

A lot of work has gone into understanding how and why marine fauna is distributed along the West Antarctic Peninsula, and this has given rise to what is called the canyon hypothesis.  Anyone who’s ever been to Monterey Bay, California or read John Steinbeck’s famous novel Cannery Row is already familiar with the role that submarine canyons can play in marine ecology.  In the case of Monterey Bay dense schools of sardines congregate (or rather congregated, before they were all fished out) at the head of a deep marine canyon that cuts across the continental shelf.  Sardines, much like krill in the Antarctic, are a critical intermediate in the food web, being small enough to feed on nearly-microscopic plankton and large enough to serve as a practical food source for big predatory fish, seals, and whales.

Sardines concentrate at the head of Monterey Canyon because their food source concentrates there.  If we follow that logic further down the food web we reach a point where abundant nutrients, namely phosphorous, nitrogen, and silicate, support the growth of phytoplankton.  These are fed on by small zooplankton, which in turn are fed on by sardines, and the biomass is slowly channeled up the foodweb.  So the distribution of megafauna is dependent on the distribution of nutrients, but what do canyons have to do with all this?

Throughout the world’s oceans deep water is generally more nutrient rich than surface water.  In the photic zone, the portion of the water column that has enough light to support photosynthesis, nutrients are quickly used up by phytoplankton.  By contrast in the deep, dark ocean there is no photosynthesis, and the bacterial degradation of organic matter sinking out of the photic-zone releases a considerable fraction of these nutrients back into the water column.  Generally the deeper the water the older it is, and the longer it has had to accumulate nutrients.  Places in the ocean where this deep, nutrient-rich water reaches the surface are highly productive and are often famous for their fisheries.

Coastal upwelling site, where nutrient-rich deep water is returned to the photic zone.  Figure taken from

Coastal upwelling sites, where nutrient-rich deep water is returned to the photic zone. Figure taken from Capon and Hutchins, 2013.  Notable upwelling sites are circled in white and include the (clockwise from top-left) California current, Canary, Benguela, and Peruvian upwelling systems.

Much of this upwelling of deep nutrient-rich water is caused by a geophysical phenomenon called Ekman transport.  Locally however, marine canyons can provide an additional opportunity for upwelling by channeling deep water onto and across the continental shelf.  Returning to Palmer Station, let’s take a look at the bathymetery of Arthur Harbor:

The Bathymetry of Arthur Harbor, reconstructed from data collected by Philippe Tortell.

The Bathymetry of Arthur Harbor, reconstructed from data collected by Philippe Tortell.  Station B, one of the regular LTER sampling sites, is shown by an open circle (Station E, our other regular sampling site, is off the map along a trajectory 160 degrees from Station B).  The green area that terminates at Station B is the head of a network of marine canyons.

We have nothing like the detailed bathymetery of Monterey Canyon, probably one of the best-studied submarine canyons in the world, but you don’t need ultra-high resolution to make out the network of submarine canyons snaking into Arthur Harbor.  These canyons don’t cut to the phenomenal depth of Monterey Canyon, but due to the unique setting of the coastal Antarctic they don’t need to.  Away from the immediate coastal area surface waters around Antarctica are iron limited.  This is the result of limited dust deposition and a lack of rivers.  Because of this iron limitation nitrogen, silicate, and phosphate are less likely to be drawn down.  Submarine canyons along the West Antarctic Peninsula are able to channel intermediate-depth nutrient-rich water from offshore areas right into coastal bays and fjords.  The result is a convergence of iron-rich nearshore water and macronutrient-rich offshore water and high biological productivity.

Ashley and Chelsea take one of the Schoefield group's gliders for a test swim in advance of deployments later this month.

Ashley and Chelsea take one of the Schofield group’s gliders for a test swim in advance of deployments later this month.

Of course the penguins and seals know all this, but it’s taken us a while to figure it out.  Oscar Schofield‘s group in the Palmer LTER project has done some really amazing work with gliders to validate the canyon hypothesis; tagging penguins from Torgesen Island and programming gliders equipped with bio-optical sensors to follow the penguins to their feeding grounds.  Not surprisingly the penguins feed on krill that congregate at the head of the submarine canyon, just as sardines congregate in Monterey Bay.  We are still data-limited for much of the West Antarctic Peninsula, but there seems to be a remarkable correlation between the locations of penguin colonies and major submarine canyons, suggesting that the canyon hypothesis is not limited to Arthur Harbor.

As I’m writing this Nicole, Ashley, and Chelsea are back at Station B in an attempt to return to our bi-weekly sampling program.  Boating was shut down for most of the week from ice and/or high winds, and winds and warmer temperatures have finally succeeded in breaking up much of the fast ice in Arthur Harbor.  After six weeks our ice station is finally gone, and in less than two weeks Jamie and I will be gone as well!

What is the U.S. Commitment in Paris?

The 2015 Paris Climate Summit - Fri, 12/11/2015 - 08:55

US emissions chartThe United States has joined 185 countries in promising to curb carbon dioxide and other greenhouse gas emissions, develop other ways to mitigate the impacts and to make communities more resilient to climate change. These proposals, called the “Intended Nationally Determined Contributions,” have been submitted to the United Nations prior to 12 days of negotiations going on now in Paris.

At the opening of the talks Monday, President Obama told the gathering, “I’ve come here personally as the leader of the world’s largest economy and the second largest emitter [of greenhouse gases] to say that the United States not only recognizes its role in creating this problem, we embrace our responsibility to do something about it.”

So what exactly is the United States proposing to do?

The United States has committed to reduce its greenhouse gas emissions by 26-28 percent below the 2005 level in 2025, and to make “best efforts” to reduce emissions by 28 percent. That would include curbs on carbon dioxide, methane, nitrous oxide, perfluorocarbons, sulfur hexafluoride and nitrogen trifluoride, all of which contribute to global warming.

How will we do that? The United States already is taking measures that will help reduce emissions. The nation can continue that effort by becoming more efficient in how we use energy in everything from buildings and cars to washing machines and cell phones; using a greater portion of alternative energies like solar and wind over fossil fuels; and developing better technologies for energy storage, and for the capture, storage and recycling of carbon.

All of that could take place through a combination of laws, regulations and incentives—Congress and the courts willing. That includes regulations under the Clean Air Act that would force electric power plants to reduce their carbon emissions; and grants and tax incentives to propel the development of more alternative energy sources like wind and solar power.

The power sector now accounts for 31 percent of U.S. emissions. Efforts to upgrade the electricity grid to better accommodate intermittent sources like solar and wind would help, as would development of better energy storage technologies.

The efforts to date have put the U.S. on a path to reduce emissions 17 percent below the 2005 level by 2020. To reach the new 2025 goal, the nation will have to double the pace.


U.S. greenhouse gas emissions by economic sector. Source: EPA

Here’s a look at key ways we’re cutting emissions:

Fuel economy standards: Transportation accounts for about 27 percent of U.S. emissions. The government has been setting “corporate average fuel economy” standards since 1975—requiring automakers to meet an average miles-per-gallon standard for their products (with exceptions), or pay a penalty. The U.S. has adopted new standards for light-duty vehicles produced between 2012 and 2025, and for heavy duty vehicles for 2014-2018. The U.S. Department of Transportation and the Environmental Protection Agency are preparing to set new standards for heavy-duty vehicles post 2018.

Buildings and appliances: The Department of Energy is preparing measures to curb emissions by setting energy conservation standards for appliances and other types of equipment, and building code standards for commercial and residential buildings. Many of these standards already exist; they are likely to become stronger.


U.S. greenhouse gas emissions by type. Source: EPA

Power plants: 31 percent of greenhouse gas emissions come from the production of electricity, most of which relies on fossil fuels, mostly natural gas and coal. The Clean Power Plan established by the EPA under the Clean Air Act sets goals for each state to cut carbon pollution, and allows states to come up with their own plans to meet those goals. The plan is likely to greatly reduce reliance on coal, which is the most polluting fuel. The plan has been challenged in Congress and the courts.

Other greenhouse gases: The EPA has pushed for other ways to reduce emissions of other greenhouse gases, such as methane, nitrous oxide, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride. The EPA is developing standards to address methane emissions from landfills and the oil and gas sector.

Financial and aid commitments: The U.S. already has pledged $3 billion to the Green Climate Fund, an international pool of funding intended to help countries adopt less-polluting energy sources and cut emissions. This week, Secretary of State John Kerry told the climate gathering that the United States also will double its commitment to $861 million in grant-based investments to help developing nations find ways to adapt to climate change. To what extent the U.S. Congress will go along with that remains to be seen.

To see the U.S. commitment, visit this site; and for an analysis, take a look at this blog post at the World Resources Institute site.

For a good overview of what different nations are saying they will do, try this site.

And what about other countries? Here are examples from key players:

The European Union: Similar to the United States, the EU has pledged to reduce emissions. They have committed to a target of at least 40 percent domestic emissions reductions below 1990 by 2030. The EU emphasizes the importance of transparency of accounting and reporting of emissions in quantitative assessments. The EU proposal does not specifically mention how the member countries plan to accomplish the goal.

There are challenges unique to each country in the EU. France is heavily dependent on nuclear energy, which should give them a boost. Germany on the other hand has been moving away from nuclear energy, and is committed to broadening its renewable energy portfolio, but has been hampered by higher energy prices.

China: China is the leading emitter of greenhouse gases. And, the country’s proposal includes measure aimed at climate change mitigation, adaptation, finance, technology development and transfer, capacity building and transparency of action and support. The country says it will reduce CO2 emissions per unit of GDP—known as carbon intensity—by 60 to 65 percent below 2005 levels by 2030. That means its energy consumption will continue to grow, but they plan to use it more efficiently, before they hope to peak energy use in 2030. China also plans to increase forest carbon stock volume by around 4.5 billion cubic meters from 2005 levels by 2030. In other words, they will plant a lot of trees that can soak up carbon from the atmosphere, mitigating some of the added energy they will be using.

According to an analysis by the World Resources Institute, “increasing forest carbon stocks by 4.5 billion cubic meters implies an increase in forest cover of 50-100 million hectares (124-247 million acres) of forest, or about two to four times the size of the United Kingdom. This amount of forest would create a roughly 1-gigaton carbon sink, equivalent to stopping tropical deforestation for almost a full year, or taking 770 million cars off the road.”

India: India is particularly interesting to look at because of its growing population. As a developing nation, India is concerned with how it can develop while lowering the emissions intensity—the amount of emissions per capital or per unit of production. They hope to accomplish decreased emissions with financial help from developed nations, who have been responsible for the bulk of greenhouse gas emissions over the past 150 years.

India hopes to reduce emissions intensity of its GDP by 33-35 percent by 2030, and achieve 40 percent cumulative electric power installed capacity from non-fossil fuel based energy resources by 2030 with the help of transfer technology and low-cost international financing from the Green Climate Fund. That fund was set up by the UN to help developing countries mitigate and adapt to climate change.

Jennifer Sweeney, an intern at The Earth Institute, contributed research and writing for this post.




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