{"id":12337,"date":"2024-10-29T12:08:31","date_gmt":"2024-10-29T16:08:31","guid":{"rendered":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/nasa-helps-find-thawing-permafrost-adds-to-near-term-global-warming\/"},"modified":"2024-10-29T12:08:31","modified_gmt":"2024-10-29T16:08:31","slug":"nasa-helps-find-thawing-permafrost-adds-to-near-term-global-warming","status":"publish","type":"post","link":"https:\/\/zobi.alcowep.com\/bourtagshdrevxnls658739\/nasa-helps-find-thawing-permafrost-adds-to-near-term-global-warming\/","title":{"rendered":"NASA Helps Find Thawing Permafrost Adds to Near-Term Global Warming"},"content":{"rendered":"

NASA Helps Find Thawing Permafrost Adds to Near-Term Global Warming<\/h2>\n

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4 min read<\/p>\n

Preparations for Next Moonwalk Simulations Underway (and Underwater)<\/h1>\n<\/div>\n<\/div>\n<\/div>\n
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\"Permafrost<\/a><\/figure>
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The Permafrost Tunnel north of Fairbanks, Alaska, was dug in the 1960s and is run by the U.S. Army\u2019s Cold Regions Research and Engineering Laboratory. It is the site of much research into permafrost \u2014 ground that stays frozen throughout the year, for multiple years.<\/div>\n
NASA\/Kate Ramsayer<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n

Earth\u2019s far northern reaches have locked carbon underground for millennia. New research paints a picture of a landscape in change.<\/em><\/em><\/p>\n

A new study, co-authored by NASA scientists, details where and how greenhouse gases are escaping from the Earth\u2019s vast northern permafrost region as the Arctic warms. The frozen soils encircling the Arctic from Alaska to Canada to Siberia store twice as much carbon as currently resides in the atmosphere \u2014 hundreds of billions of tons \u2014 and most of it has been buried for centuries.<\/p>\n

An international team, led by researchers at Stockholm University, found<\/a> that from 2000 to 2020, carbon dioxide uptake by the land was largely offset by emissions from it. Overall, they concluded that the region has been a net contributor to global warming in recent decades in large part because of another greenhouse gas, methane, that is shorter-lived but traps significantly more heat per molecule than carbon dioxide.<\/p>\n

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Greenhouse gases shroud the globe in this animation showing data from 2021. Carbon dioxide is shown in orange; methane is shown in purple. Methane traps heat 28 times more effectively than carbon dioxide over a 100-year timescale. Wetlands are a significant source of such emissions.<\/div>\n<\/div>\n
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NASA\u2019s Scientific Visualization Studio<\/div>\n<\/div>\n<\/div>\n<\/div>\n

The findings reveal a landscape in flux, said Abhishek Chatterjee, a co-author and scientist at NASA\u2019s Jet Propulsion Laboratory in Southern California. \u201cWe know that the permafrost region has captured and stored carbon for tens of thousands of years,\u201d he said. \u201cBut what we are finding now is that climate-driven changes are tipping the balance toward permafrost being a net source of greenhouse gas emissions.\u201d<\/p>\n

Carbon Stockpile<\/strong><\/h3>\n

Permafrost is ground that has been permanently frozen for anywhere from two years to hundreds of thousands of years. A core of it reveals thick layers of icy soils enriched with dead plant and animal matter that can be dated using radiocarbon and other techniques. When permafrost thaws and decomposes, microbes feed on this organic carbon, releasing some of it as greenhouse gases.<\/p>\n

Unlocking a fraction of the carbon stored in permafrost could further fuel<\/a> climate change. Temperatures in the Arctic are already warming two to four times faster than the global average, and scientists are learning how thawing permafrost is shifting<\/a> the region from being a net sink for greenhouse gases to becoming a net source of warming.<\/p>\n

They\u2019ve tracked emissions using ground-based instruments, aircraft, and satellites. One such campaign, NASA\u2019s Arctic-Boreal Vulnerability Experiment (ABoVE<\/a>), is focused on Alaska and western Canada. Yet locating and measuring emissions across the far northern fringes of Earth remains challenging. One obstacle is the vast scale and diversity of the environment, composed of evergreen forests, sprawling tundra, and waterways.<\/p>\n

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\"This<\/a><\/figure>
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This map, based on data provided by the National Snow and Ice Data Center, shows the extent of Arctic permafrost. The amount of permafrost underlying the surface ranges from continuous \u2014 in the coldest areas \u2014 to more isolated and sporadic patches.<\/div>\n
NASA Earth Observatory<\/div>\n<\/figcaption><\/div>\n<\/div>\n<\/div>\n

Cracks in the Sink<\/strong><\/h3>\n

The new study was undertaken as part of the Global Carbon Project\u2019s RECCAP-2<\/a> effort, which brings together different science teams, tools, and datasets to assess regional carbon balances<\/a> every few years. The authors followed the trail of three greenhouse gases \u2014 carbon dioxide, methane, and nitrous oxide \u2014 across 7 million square miles (18 million square kilometers) of permafrost terrain from 2000 to 2020.<\/p>\n

Researchers found the region, especially the forests, took up a fraction more carbon dioxide than it released. This uptake was largely offset by carbon dioxide emitted from lakes and rivers<\/a>, as well as from fires that burned both forest and tundra.<\/p>\n

They also found that the region\u2019s lakes and wetlands were strong sources of methane during those two decades. Their waterlogged soils are low in oxygen while containing large volumes of dead vegetation and animal matter \u2014 ripe conditions for hungry microbes. Compared to carbon dioxide, methane can drive significant climate warming in short timescales before breaking down relatively quickly. Methane\u2019s lifespan in the atmosphere is about 10 years, whereas carbon dioxide can last hundreds of years.<\/p>\n

The findings suggest the net change in greenhouse gases helped warm the planet over the 20-year period. But over a 100-year period, emissions and absorptions would mostly cancel each other out. In other words, the region teeters from carbon source to weak sink. The authors noted that events such as extreme wildfires<\/a> and heat waves are major sources of uncertainty when projecting into the future.<\/p>\n

Bottom Up, Top Down<\/strong><\/h3>\n

The scientists used two main strategies<\/a> to tally greenhouse gas emissions from the region. \u201cBottom-up\u201d methods estimate emissions from ground- and air-based measurements and ecosystem models. Top-down methods use atmospheric measurements taken directly from satellite sensors, including those on NASA\u2019s Orbiting Carbon Observatory-2 (OCO-2<\/a>) and JAXA\u2019s (Japan Aerospace Exploration Agency)Greenhouse Gases Observing Satellite.<\/p>\n

Regarding near-term, 20-year, global warming potential<\/a>, both scientific approaches aligned on the big picture but differed in magnitude: The bottom-up calculations indicated significantly more warming.<\/p>\n

\u201cThis study is one of the first where we are able to integrate different methods and datasets to put together this very comprehensive greenhouse gas budget into one report,\u201d Chatterjee said. \u201cIt reveals a very complex picture.\u201d<\/p>\n

News Media Contacts<\/strong><\/h3>\n

Jane J. Lee \/ Andrew Wang
Jet Propulsion Laboratory, Pasadena, Calif.
818-354-0307 \/ 626-379-6874
jane.j.lee@jpl.nasa.gov<\/a> \/ andrew.wang@jpl.nasa.gov<\/a><\/p>\n

Written by Sally Younger<\/p>\n

2024-147<\/p>\n

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