气候变化领域集成服务门户(CCPortal): On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget

CCPortal

DOI	10.5194/acp-20-13011-2020
	On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget
	Zhao Y.; Saunois M.; Bousquet P.; Lin X.; Berchet A.; Hegglin M.I.; Canadell J.G.; Jackson R.B.; Deushi M.; Jöckel P.; Kinnison D.; Kirner O.; Strode S.; Tilmes S.; Dlugokencky E.J.; Zheng B.
发表日期	2020
ISSN	1680-7316
起始页码	13011
结束页码	13022
卷号	20 期号:21
英文摘要	Decadal trends and interannual variations in the hydroxyl radical (OH), while poorly constrained at present, are critical for understanding the observed evolution of atmospheric methane (CH4). Through analyzing the OH fields simulated by the model ensemble of the Chemistry-Climate Model Initiative (CCMI), we find (1) the negative OH anomalies during the El Niño years mainly corresponding to the enhanced carbon monoxide (CO) emissions from biomass burning and (2) a positive OH trend during 1980-2010 dominated by the elevated primary production and the reduced loss of OH due to decreasing CO after 2000. Both two-box model inversions and variational 4D inversions suggest that ignoring the negative anomaly of OH during the El Niño years leads to a large overestimation of the increase in global CH4 emissions by up to 10plmn;3 Tg yr-1 to match the observed CH4 increase over these years. Not accounting for the increasing OH trends given by the CCMI models leads to an underestimation of the CH4 emission increase by 23plmn;9 Tg yr-1 from 1986 to 2010. The variational-inversionestimated CH4 emissions show that the tropical regions contribute most to the uncertainties related to OH. This study highlights the significant impact of climate and chemical feedbacks related to OH on the top-down estimates of the global CH4 budget. © Author(s) 2020.
语种	英语
scopus关键词	annual variation; atmospheric modeling; carbon monoxide; decadal variation; El Nino; hydroxyl radical; methane; trend analysis
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247409
作者单位	Laboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, Gif-sur-Yvette, 91191, France; Department of Meteorology, University of Reading, Earley Gate, Reading, RG6 6BB, United Kingdom; Global Carbon Project, Csiro Oceans and Atmosphere, Canberra, ACT 2601, Australia; Department of Earth System Science, Woods Institute for the Environment, Precourt Institute for Energy, Stanford University, Stanford, CA, United States; Meteorological Research Institute, 1-1 Nagamine, Tsukuba, Ibaraki, 305-0052, Japan; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany; Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, Center Green Drive, Boulder, CO 3090, United States; Steinbuch Centre for Computing, Karlsruhe Institute of Technology, Karlsruhe, Germany; Nasa Goddard Space Flight Center, Greenbelt, MD, United States; Gestar, Universities Space Research Assoc...
推荐引用方式 GB/T 7714	Zhao Y.,Saunois M.,Bousquet P.,et al. On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget[J],2020,20(21).
APA	Zhao Y..,Saunois M..,Bousquet P..,Lin X..,Berchet A..,...&Zheng B..(2020).On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget.ATMOSPHERIC CHEMISTRY AND PHYSICS,20(21).
MLA	Zhao Y.,et al."On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget".ATMOSPHERIC CHEMISTRY AND PHYSICS 20.21(2020).