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Inter-model comparison of global hydroxyl radical (OH) distributions and their impact on atmospheric methane over the 2000--2016 period

Zhao, Y. and Saunois, M. and Bousquet, P. and Lin, X. and Berchet, A. and Hegglin, M. I. and Canadell, J. G. and Jackson, R. B. and Hauglustaine, D. A. and Szopa, S. and Stavert, A. R. and Abraham, N. L. and Archibald, A. T. and Bekki, S. and Deushi, M. and Jöckel, Patrick and Josse, B. and Kinnison, D. and Kirner, O. and Marécal, V. and O'Connor, F. M. and Plummer, D. A. and Revell, L. E. and Rozanov, E. and Stenke, A. and Strode, S. and Tilmes, S. and Dlugokencky, E. J. and Zheng, B. (2019) Inter-model comparison of global hydroxyl radical (OH) distributions and their impact on atmospheric methane over the 2000--2016 period. Atmospheric Chemistry and Physics (ACP), 19 (21), pp. 13701-13723. Copernicus Publications. DOI: 10.5194/acp-19-13701-2019 ISSN 1680-7316

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Official URL: https://www.atmos-chem-phys.net/19/13701/2019/

Abstract

The modeling study presented here aims to estimate how uncertainties in global hydroxyl radical (OH) distributions, variability, and trends may contribute to resolving discrepancies between simulated and observed methane (CH4) changes since 2000. A multi-model ensemble of 14 OH fields was analyzed and aggregated into 64 scenarios to force the offline atmospheric chemistry transport model LMDz (Laboratoire de Meteorologie Dynamique) with a standard CH4 emission scenario over the period 2000–2016. The multi-model simulated global volume-weighted tropospheric mean OH concentration ([OH]) averaged over 2000–2010 ranges between 8.7×105 and 12.8×105 molec cm−3. The inter-model differences in tropospheric OH burden and vertical distributions are mainly determined by the differences in the nitrogen oxide (NO) distributions, while the spatial discrepancies between OH fields are mostly due to differences in natural emissions and volatile organic compound (VOC) chemistry. From 2000 to 2010, most simulated OH fields show an increase of 0.1–0.3×105 molec cm−3 in the tropospheric mean [OH], with year-to-year variations much smaller than during the historical period 1960–2000. Once ingested into the LMDz model, these OH changes translated into a 5 to 15 ppbv reduction in the CH4 mixing ratio in 2010, which represents 7 %–20 % of the model-simulated CH4 increase due to surface emissions. Between 2010 and 2016, the ensemble of simulations showed that OH changes could lead to a CH4 mixing ratio uncertainty of >±30 ppbv. Over the full 2000–2016 time period, using a common state-of-the-art but nonoptimized emission scenario, the impact of [OH] changes tested here can explain up to 54 % of the gap between model simulations and observations. This result emphasizes the importance of better representing OH abundance and variations in CH4 forward simulations and emission optimizations performed by atmospheric inversions.

Item URL in elib:https://elib.dlr.de/131186/
Document Type:Article
Title:Inter-model comparison of global hydroxyl radical (OH) distributions and their impact on atmospheric methane over the 2000--2016 period
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zhao, Y.Laboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceUNSPECIFIED
Saunois, M.Laboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceUNSPECIFIED
Bousquet, P.Laboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceUNSPECIFIED
Lin, X.Laboratoire 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, A.Laboratoire 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, M. I.Department of Meteorology, University of Reading, Reading, UKhttps://orcid.org/0000-0003-2820-9044
Canadell, J. G.Global Carbon Project, CSIRO Oceans and Atmosphere, Canberra, Australian Capital Territory 2601, Australiahttps://orcid.org/0000-0002-8788-3218
Jackson, R. B.Earth System Science Department, Woods Institute for the Environment, and Precourt Institute for Energy, Stanford University, Stanford, CA 94305, USAhttps://orcid.org/0000-0001-8846-7147
Hauglustaine, D. A.Laboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, FranceUNSPECIFIED
Szopa, S.Laboratoire des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ), Université Paris-Saclay, 91191 Gif-sur-Yvette, Francehttps://orcid.org/0000-0002-8641-1737
Stavert, A. R.CSIRO Oceans and Atmosphere, Aspendale, Victoria, 3195, AustraliaUNSPECIFIED
Abraham, N. L.Department of Chemistry, University of Cambridge, CB2 1EW, Cambridge, UKhttps://orcid.org/0000-0003-3750-3544
Archibald, A. T.Department of Chemistry, University of Cambridge, CB2 1EW, Cambridge, UKhttps://orcid.org/0000-0001-9302-4180
Bekki, S.LATMOS, Université Pierre et Marie Curie, 4 Place Jussieu Tour 45, couloir 45–46, 3e étage Boite 102, 75252, Paris CEDEX 05, Francehttps://orcid.org/0000-0002-5538-0800
Deushi, M.Meteorological Research Institute, 1-1 Nagamine, Tsukuba, Ibaraki, 305-0052, JapanUNSPECIFIED
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Josse, B.Centre National de Recherches Météorologiques, Université de Toulouse, Météo-France, CNRS, Toulouse, FranceUNSPECIFIED
Kinnison, D.Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, 3090 Center Green Drive, Boulder, CO 80301, USAUNSPECIFIED
Kirner, O.Steinbuch Centre for Computing, Karlsruhe Institute of Technology, Karlsruhe, Germanyhttps://orcid.org/0000-0001-5668-6177
Marécal, V.Centre National de Recherches Météorologiques, Université de Toulouse, Météo-France, CNRS, Toulouse, FranceUNSPECIFIED
O'Connor, F. M.Met Office Hadley Centre, Exeter, EX1 3PB, UKUNSPECIFIED
Plummer, D. A.Climate Research Branch, Environment and Climate Change Canada, Montreal, Canadahttps://orcid.org/0000-0001-8087-3976
Revell, L. E.Institute for Atmospheric and Climate Science, ETH Zürich (ETHZ), Zürich, Switzerlandhttps://orcid.org/0000-0002-8974-7703
Rozanov, E.Institute for Atmospheric and Climate Science, ETH Zürich (ETHZ), Zürich, SwitzerlandUNSPECIFIED
Stenke, A.Institute for Atmospheric and Climate Science, ETH Zürich (ETHZ), Zürich, Switzerlandhttps://orcid.org/0000-0002-5916-4013
Strode, S.NASA Goddard Space Flight Center, Greenbelt, MD, USAhttps://orcid.org/0000-0002-8103-1663
Tilmes, S.Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research, 3090 Center Green Drive, Boulder, CO 80301, USAUNSPECIFIED
Dlugokencky, E. J.Global Monitoring Division, NOAA Earth System Research Laboratory, Boulder, CO, USAUNSPECIFIED
Zheng, B.Laboratoire 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:13 November 2019
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:19
DOI :10.5194/acp-19-13701-2019
Page Range:pp. 13701-13723
Publisher:Copernicus Publications
ISSN:1680-7316
Status:Published
Keywords:hydroxyl-radical, OH, oxidation capacity, atmospheric modelling, CCMI, EMAC, MESSy, Modular Earth Submodel System, methane, global atmospheric modelling, methane lifetime
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - Transport und Klima
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:25 Nov 2019 09:08
Last Modified:02 Feb 2020 20:16

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