Accelerated methane emission from permafrost regions since the 20th century

doi:10.1016/j.dsr.2023.103981

	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-dong1,2,3
	2023-05-01
发表期刊	DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
ISSN	0967-0637
卷号	195 页码:8
通讯作者	Sun, Wei-dong(weidongsun@qdio.ac.cn)
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.
关键词	Permafrost region Methane emission AO2 ACO2 index Permafrost thawing
DOI	10.1016/j.dsr.2023.103981
收录类别	SCI
语种	英语
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研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001009360100001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS关键词	CLIMATE-CHANGE ; CARBON RELEASE ; ANTARCTIC ICE ; BUDGET ; SEEPS
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/182306
专题	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.Inst Oceanol, Chinese Acad Sci, Ctr Deep Sea Res, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 2.Laoshan Lab, Deep Sea Multidisciplinary Res Ctr, Qingdao 266237, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
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.