Accelerated methane emission from permafrost regions since the 20th century

doi:10.1016/j.dsr.2023.103981

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	Accelerated methane emission from permafrost regions since the 20th century
	Xie, Guo-zhi 1,2,3; Zhang, Li-peng 1,2,3; Li, Cong-ying 1,2,3; Sun, Wei-dong 1,2,3
刊名	DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
	2023-05-01
卷号	195 页码:8
关键词	Permafrost region Methane emission AO2 ACO2 index Permafrost thawing
ISSN号	0967-0637
DOI	10.1016/j.dsr.2023.103981
通讯作者	Sun, Wei-dong(weidongsun@qdio.ac.cn)
英文摘要	Carbon dioxide has been increasing in the atmosphere since the industrialization, resulting in global warming, which in turn enhanced methane emissions from permafrost regions. However, methane emitted into the at-mosphere is quickly oxidized, such that the intensity and threat of methane emission in the past are severely underestimated. Here we show that the ratio between annual changes in atmospheric oxygen and carbon dioxide concentrations (AO2/ACO2 index) dropped dramatically between 1945 and 1958. There are no such abrupt changes in the fossil fuel combustion curve. Considering that atmospheric methane has the residence time less than-9 years through biological and chemical processes, this crisis is attributed to the World War II, which had disturbed gas hydrates underneath ocean floors and permafrost regions. Consistently, the land-ocean tempera-ture index fluctuated more severely in permafrost regions than the global average during the WWII, indicating stronger greenhouse effects induced by methane emission. This is supported by the changes in the AO2/ACO2 index, coupled with higher atmospheric methane concentrations and lower 813CO2 in permafrost regions in the last three decades, suggesting accelerated methane emission. The anthropogenic carbon dioxide emission has been pushing the accelerated thawing of permafrost, which promotes methane emission that further intensifies permafrost thawing and global warming. Such a positive feedback at an inflection point of Earth climate may break the glacial-interglacial cycle and initiate a long-lasting greenhouse period.
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050103] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020303] ; Taishan Scholar Program of Shandong[ts201712075]
WOS关键词	CLIMATE-CHANGE ; CARBON RELEASE ; ANTARCTIC ICE ; BUDGET ; SEEPS
WOS研究方向	Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:001009360100001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/182305]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Sun, Wei-dong
作者单位	1.Laoshan Lab, Deep Sea Multidisciplinary Res Ctr, Qingdao 266237, Peoples R China 2.Inst Oceanol, Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Xie, Guo-zhi,Zhang, Li-peng,Li, Cong-ying,et al. Accelerated methane emission from permafrost regions since the 20th century[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2023,195:8.
APA	Xie, Guo-zhi,Zhang, Li-peng,Li, Cong-ying,&Sun, Wei-dong.(2023).Accelerated methane emission from permafrost regions since the 20th century.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,195,8.
MLA	Xie, Guo-zhi,et al."Accelerated methane emission from permafrost regions since the 20th century".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 195(2023):8.