elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget

Zhao, Yuanhong and Saunois, Marille and Bousquet, Philippe and Lin, Xin and Berchet, Antoine and Hegglin, Michaela I. and Canadell, Josep G. and Jackson, Robert B. and Deushi, Makoto and Jöckel, Patrick and Kinnison, Douglas and Kirner, Ole and Strode, Sarah and Tilmes, Simone and Dlugokencky, Edward J. and Zheng, Bo (2020) On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget. Atmospheric Chemistry and Physics (ACP), 20 (21), pp. 13011-13022. Copernicus Publications. doi: 10.5194/acp-20-13011-2020. ISSN 1680-7316.

[img] PDF - Postprint version (accepted manuscript)
2MB

Official URL: https://acp.copernicus.org/articles/20/13011/2020/

Abstract

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 10 ± 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 23 ± 9 Tg yr−1 from 1986 to 2010. The variational-inversion-estimated 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.

Item URL in elib:https://elib.dlr.de/137288/
Document Type:Article
Title:On the role of trend and variability in the hydroxyl radical (OH) in the global methane budget
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zhao, YuanhongLaboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceUNSPECIFIED
Saunois, MarilleLaboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceUNSPECIFIED
Bousquet, PhilippeLaboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceUNSPECIFIED
Lin, XinLaboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, Francehttps://orcid.org/0000-0002-0605-6430
Berchet, AntoineLaboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, Francehttps://orcid.org/0000-0001-6709-0125
Hegglin, Michaela I.2Department of Meteorology, University of Reading, Earley Gate, Reading, RG6 6BB, United Kingdomhttps://orcid.org/0000-0003-2820-9044
Canadell, Josep G.Global Carbon Project, CSIRO Oceans and Atmosphere, Canberra, Australian Capital Territory 2601, Australiahttps://orcid.org/0000-0002-8788-3218
Jackson, Robert B.Department of Earth System Science, Woods Institute for the Environment, and Precourt Institute for Energy, Stanford University, Stanford, CA, USAhttps://orcid.org/0000-0001-8846-7147
Deushi, MakotoMeteorological Research Institute, 1-1 Nagamine, Tsukuba, Ibaraki, 305-0052, JapanUNSPECIFIED
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Kinnison, DouglasAtmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, 3090 Center Green Drive, Boulder, CO, USAUNSPECIFIED
Kirner, OleSteinbuch Centre for Computing, Karlsruhe Institute of Technology, Karlsruhe, Germanyhttps://orcid.org/0000-0001-5668-6177
Strode, SarahNASA Goddard Space Flight Center, Greenbelt, MD, USAhttps://orcid.org/0000-0002-8103-1663
Tilmes, SimoneAtmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, 3090 Center Green Drive, Boulder, CO, USAUNSPECIFIED
Dlugokencky, Edward J.Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, USAUNSPECIFIED
Zheng, BoLaboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, Francehttps://orcid.org/0000-0001-8344-3445
Date:6 November 2020
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:20
DOI:10.5194/acp-20-13011-2020
Page Range:pp. 13011-13022
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:EMAC. MESSy. CCMI. Chemistry Climate Modelling. hydroxyl radical, methane, global modelling, methane budget, variability
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds, R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:09 Nov 2020 07:55
Last Modified:09 Nov 2020 07:55

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.