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Coastlines' Contribution to Climate Change Might Have Been Underestimated | |
admin | |
2019-11-08 | |
发布年 | 2019 |
语种 | 英语 |
国家 | 美国 |
领域 | 气候变化 |
正文(英文) | Permafrost coasts make up about one third of the Earth's total coastline. As a result of accelerated climate change, whole sections of coastline rapidly thaw, and erode into the Arctic Ocean. A new study published in the journal Geophysical Research Letters now shows that large amounts of carbon dioxide are potentially being produced along these eroding permafrost coastlines in the Arctic. "Carbon budgets and climate simulations have so far missed coastal erosion in their equations even though it might be a substantial source of carbon dioxide," says George Tanski of Vrije Universiteit Amsterdam, lead author of the study. "Our research found that the erosion of permafrost coastlines can lead to the rapid release of significant quantities of CO2, which can be expected to increase as coastal erosion accelerates, temperatures increase, sea ice diminishes, and stronger storms batter Arctic coasts." The study was carried out during Tanski's time at the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), and the GFZ German Research Centre for Geosciences. Co-Authors come from AWI, GFZ, and the Universities of Hamburg and Potsdam. The study is part of the Nunataryuk research project, coordinated by AWI. The project aims to analyse permafrost thaw, understand its impacts on indigenous communities and other populations, and develop mitigation and adaptation strategies. Simulating erosion effects in the lab For the new study, the researchers simulated the effects of erosion in a lab experiment. To find out how much carbon is released into the atmosphere along eroding Arctic permafrost coasts, they collected permafrost samples from Qikiqtaruk (also known as Herschel Island) off the northern coast of the Yukon in northwest Canada, and seawater from offshore. They mixed permafrost and seawater samples and then measured the greenhouse gases emitted over the course of four months, the average length of open-water season in the Arctic. The researchers found that CO2 was released as rapidly from thawing permafrost in seawater as it is from thawing permafrost on land. Previous research had documented that thawing permafrost on land causes significant releases of greenhouse gases. This new research indicates that eroding permafrost coasts and nearshore waters are also a potentially notable source of CO2 emissions. It draws into question carbon budgets that have identified the coastal zone mainly as a point of passage for carbon from land to sea, neglecting possible carbon transport into the atmosphere.
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Story Source: Materials provided by GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre. Note: Content may be edited for style and length. Journal Reference:
Cite This Page: GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre. "Coastlines' contribution to climate change might have been underestimated: Erosion of permafrost coasts in the Arctic could vent major amounts of CO2." ScienceDaily. ScienceDaily, 8 November 2019.
GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre. (2019, November 8). Coastlines' contribution to climate change might have been underestimated: Erosion of permafrost coasts in the Arctic could vent major amounts of CO2. ScienceDaily. Retrieved January 18, 2020 from www.sciencedaily.com/releases/2019/11/191108162559.htm
GFZ GeoForschungsZentrum Potsdam, Helmholtz Centre. "Coastlines' contribution to climate change might have been underestimated: Erosion of permafrost coasts in the Arctic could vent major amounts of CO2." ScienceDaily. www.sciencedaily.com/releases/2019/11/191108162559.htm (accessed January 18, 2020).
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URL | 查看原文 |
来源平台 | Science Daily |
文献类型 | 新闻 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/220559 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | admin. Coastlines' Contribution to Climate Change Might Have Been Underestimated. 2019. |
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