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    • 2017-06-14 11:00:29
    • Article ID: 676391

    Defrosting the World’s Freezer: Thawing Permafrost

    To enhance Earth system models, researchers are examining how and why permafrost thaws and melts.

    • Credit: Stan Wullschleger, NGEE Arctic director and a researcher at Oak Ridge National Laboratory

      Alex Kholodov (University of Alaska, Fairbanks) uses an electric auger to prepare holes for water wells at NGEE Arctic Sites in Barrow, Alaska.

    • Credit: Stan Wullschleger, NGEE Arctic director and a researcher at Oak Ridge National Laboratory

      Large thermokarst disturbance along the Selawik River in Alaska. When these wedges of ice melt, the ground underneath them often collapses.

    Snowy peaks rise up in one direction; boggy tundra spreads across the other. Fuzzy heads of long-stemmed plants sway in the wind, interspersed with bog blueberries. This is Alaska’s Eight Mile Lake, where the nearest town has a population of just over a thousand people.

    Researchers supported by the Department of Energy’s Office of Science are visiting here and other remote locations to study how permafrost – soil that’s frozen for consecutive multiple years – thaws. Because soils in high latitude systems where this happens store almost twice as much carbon as the entire atmosphere, figuring out the thawing process is essential to modeling terrestrial ecosystems and climate. Improving Earth system models can help scientists better understand the likely extent and effects of future climate change.

     

    The Earth’s Freezer

    Permafrost’s deep layers act like the world’s ice chest, locking away organic matter such as dead plants and animals from degradation for thousands of years. The cold temperatures and waterlogged soil slows decomposition to a near halt.

    But today the Arctic is warming at a pace that hasn’t occurred for the past three million years. Rising at a rate twice as fast as the rest of Earth, the Arctic’s average temperature could increase by as much as 14 F between 2081 and 2100.

    This warming could cause permafrost to thaw much faster and more extensively than ever before. Depending on the rate and extent of climate change, the Arctic could lose 30 to 70 percent of its permafrost in the next century.

    Organic matter in thawed permafrost can decompose rapidly. As bacteria, fungi, and other tiny organisms break down the matter, they release the greenhouse gases carbon dioxide and methane. Every 1 degree C (1.8 degree F) increase in average global temperatures could result in permafrost thawing enough that it releases a year-and-a-half’s worth of human-made carbon dioxide emissions. Greenhouse gases from the thawed permafrost would lead to more climate change, which then could lead to more permafrost thawing – a self-reinforcing cycle.

    “This is the most important tipping point,” said Jizhong Zhou, a researcher at Lawrence Berkeley National Laboratory (LBNL) and professor at the University of Oklahoma.

     

    A Rewarding Collaboration

    While researchers understand why permafrost is important, many questions remain unanswered. Even models that have in-depth information about land, ocean, and atmospheric processes lack enough detail about the Arctic.

    That’s where field and laboratory research come in. Before 2012, permafrost researchers and climate modelers usually worked separately. But through the Next-Generation Ecosystem Experiments Arctic (NGEE Arctic) project, teams from DOE headquarters, DOE national laboratories, and universities brought together field, laboratory, and modeling researchers to share their needs and expertise.

    “This is a level of dynamics and interactions that we just haven’t had in the past,” said Stan Wullschleger, NGEE Arctic director and a researcher at Oak Ridge National Laboratory. “[These collaborations] make for a much more informed, richer discussion about how field, laboratory, and modeling scientists can interact.”

     

    Research in a Brutal Landscape

    Studying permafrost is far from easy. When temperatures plummet more than 20 degrees below zero, wires become so brittle that a mere jostle cracks them. Because short winter days render solar panels useless, researchers must haul around car-sized batteries to power their instruments. But the essential data these studies provide make it all worthwhile.

    One major type of field study allows scientists to investigate how temperature affects the rate of thawing. To simulate how a permafrost ecosystem would react to both warmer summers and winters, researchers create ecosystem in miniature. To mimic summer conditions, they use open-topped greenhouses that warm the air. For winter conditions, they set up fences where snow piles up, warming the ground like a comforter insulating a bed.

    While it seems as if summer would affect permafrost the most, it’s actually winter warming that causes thawing. One major study supported by the Office of Science found that although summer conditions didn’t warm the soil, winter warming increased soil temperatures by 3-5 F. After only three years, these changes led to a 45 percent increase in respiration, the process that produces carbon dioxide.  There were some increases in plant growth and uptake of carbon dioxide, but it wasn’t nearly enough to offset the releases.

    Changes in water movement also could accelerate thawing. Currently, wedges of ice make up one-fifth of the upper layer of permafrost. These ice wedges are so foundational to the landscape that when they melt, the ground actually collapses. The resulting shifts can connect troughs and lakes so much that they drain out, transforming the ecosystem’s water distribution.

    A study by NGEE Arctic found that temperature increases of as little as 9 F can cause ice wedges to cave in within 15 to 20 years. And they don’t have to be changes in average temperature – an unusually hot summer can kick-start the process.  

    “It’s a transformation that’s not easily undone. Certainly not in our lifetime,” said Sue Natali, a permafrost researcher at Woods Hole Research Center.

     

    Back at the Lab

    Watching the landscape shift is enlightening, but field work alone can’t describe the underlying processes. Bringing samples back to the laboratory allows researchers to isolate specific variables.

    Because melting ice wedges could cause major changes in water distribution, it’s essential to know how decomposition could vary depending on the soil’s water level. One NGEE Arctic study discovered substantial differences between decomposition in dry soils with oxygen (aerobic) and waterlogged soils that don’t have oxygen (anaerobic). Researchers found that dry, aerobic soils released twice as much carbon dioxide and methane after thawing than waterlogged, anaerobic ones did after thawing.

    Microbes, such as bacteria and fungi, are another major focus of lab research. Various studies have examined which of these tiny organisms are most common in permafrost before and after thawing and compared the difference between microbes in different layers. One study supported by the Office of Science found that after only 18 months of warming, the microbes’ respiration that produces carbon dioxide increased by 38 percent.

     

    Climate Models Bring it All Together

    These field and laboratory observations are making climate models more accurate than ever before. In fact, the first-generation models didn’t include permafrost at all.

    “The realization that the models were missing the single largest pool of carbon was a real driver of what we’ve done since then,” said Charlie Koven, an LBNL climate modeler.

    Researchers use field and laboratory data to help models reflect the real world as closely as possible. To increase specificity, they feed data such as soil temperature, rates of thawing, and water movement directly into models. To test accuracy, researchers run the model with certain conditions and then compare the results to real-world experiments conducted under comparable conditions. 

    Using much of this data, a climate model supported by the Office of Science shows that if climate change continues at its current rate, half of the world’s permafrost could thaw by the end of the century.

    The next challenge is to integrate complex microbial data into computer models that already have millions of lines of code.

    Whether researchers are measuring snow in some of the most brutal places on Earth, thawing soil in a laboratory, or examining a computer screen, each contributes to our understanding of the Arctic’s vast stores of carbon.

     “[NGEE Arctic] was and continues to be a great example of how the national labs can interact,” said Wullschleger. “This kind of an [approach] just really accelerates improvement of climate models.”

      

    The Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information please visit http://science.energy.gov.

     

    Shannon Brescher Shea is a Senior Writer/Editor in the Office of Science, shannon.shea@science.doe.gov.

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