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Recent advances in the study of Arctic submarine permafrost
Permafrost and Periglacial Processes ( IF 5 ) Pub Date : 2020-07-01 , DOI: 10.1002/ppp.2061
Michael Angelopoulos 1, 2 , Pier P. Overduin 1 , Frederieke Miesner 1 , Mikhail N. Grigoriev 3, 4 , Alexander A. Vasiliev 5, 6
Affiliation  

Submarine permafrost is perennially cryotic earth material that lies offshore. Most submarine permafrost is relict terrestrial permafrost beneath the Arctic shelf seas, was inundated after the last glaciation, and has been warming and thawing ever since. As a reservoir and confining layer for gas hydrates, it has the potential to release greenhouse gasses and impact coastal infrastructure, but its distribution and rate of thaw are poorly constrained by observational data. Lengthening summers, reduced sea ice extent and increased solar heating will increase water temperatures and thaw rates. Observations of gas release from the East Siberian shelf and high methane concentrations in the water column and air above it have been attributed to flowpaths created in thawing permafrost. In this context, it is important to understand the distribution and state of submarine permafrost and how they are changing. We assemble recent and historical drilling data on regional submarine permafrost degradation rates and review recent studies that use modelling, geophysical mapping and geomorphology to characterize submarine permafrost. Implications for submarine permafrost thawing are discussed within the context of methane cycling in the Arctic Ocean and global climate change.

中文翻译:

北极海底多年冻土研究新进展

海底永久冻土层是位于近海的常年低温地球物质。大多数海底永久冻土是北极大陆架海下残留的陆地永久冻土,在最后一次冰川作用后被淹没,此后一直在变暖和解冻。作为天然气水合物的储集层和围压层,它具有释放温室气体和影响沿海基础设施的潜力,但其分布和解冻速度受观测数据的约束很差。延长夏季、减少海冰范围和增加太阳能加热将增加水温和解冻率。观测到东西伯利亚大陆架释放的气体以及水体和其上方空气中的高甲烷浓度归因于永久冻土融化形成的流动路径。在这种情况下,了解海底永久冻土的分布和状态及其变化方式非常重要。我们收集了有关区域海底永久冻土退化率的近期和历史钻探数据,并回顾了最近使用建模、地球物理绘图和地貌学来表征海底永久冻土的研究。在北冰洋甲烷循环和全球气候变化的背景下讨论了海底永久冻土融化的影响。
更新日期:2020-07-01
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