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The response of mesospheric H₂O and CO to solar irradiance variability in models and observations

Karagodin-Doyennel, Arsenij and Rozanov, Eugene and Kuchar, Ales and Ball, William and Arsenovic, Pavle and Remsberg, Ellis and Jöckel, Patrick and Kunze, Markus and Plummer, David A. and Stenke, Andrea and Marsh, Daniel and Kinnison, Doug and Peter, Thomas (2021) The response of mesospheric H₂O and CO to solar irradiance variability in models and observations. Atmospheric Chemistry and Physics (ACP), 21 (1), pp. 201-216. Copernicus Publications. doi: 10.5194/acp-21-201-2021. ISSN 1680-7316.

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Official URL: https://acp.copernicus.org/articles/21/201/2021/


Water vapor (H2O) is the source of reactive hydrogen radicals in the middle atmosphere, whereas carbon monoxide (CO), being formed by CO2 photolysis, is suitable as a dynamical tracer. In the mesosphere, both H2O and CO are sensitive to solar irradiance (SI) variability because of their destruction/production by solar radiation. This enables us to analyze the solar signal in both models and observed data. Here, we evaluate the mesospheric H2O and CO response to solar irradiance variability using the Chemistry-Climate Model Initiative (CCMI-1) simulations and satellite observations. We analyzed the results of four CCMI models (CMAM, EMAC-L90MA, SOCOLv3, and CESM1-WACCM 3.5) operated in CCMI reference simulation REF-C1SD in specified dynamics mode, covering the period from 1984–2017. Multiple linear regression analyses show a pronounced and statistically robust response of H2O and CO to solar irradiance variability and to the annual and semiannual cycles. For periods with available satellite data, we compared the simulated solar signal against satellite observations, namely the GOZCARDS composite for 1992–2017 for H2O and Aura/MLS measurements for 2005–2017 for CO. The model results generally agree with observations and reproduce an expected negative and positive correlation for H2O and CO, respectively, with solar irradiance. However, the magnitude of the response and patterns of the solar signal varies among the considered models, indicating differences in the applied chemical reaction and dynamical schemes, including the representation of photolyzes. We suggest that there is no dominating thermospheric influence of solar irradiance in CO, as reported in previous studies, because the response to solar variability is comparable with observations in both low-top and high-top models. We stress the importance of this work for improving our understanding of the current ability and limitations of state-of-the-art models to simulate a solar signal in the chemistry and dynamics of the middle atmosphere.

Item URL in elib:https://elib.dlr.de/140297/
Document Type:Article
Title:The response of mesospheric H₂O and CO to solar irradiance variability in models and observations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Karagodin-Doyennel, ArsenijThe Institute for Atmospheric and Climate Science (IAC), ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Rozanov, EugeneThe Physikalisch-Meteorologisches Observatorium Davos/World Radiation Center (PMOD/WRC), Davos, Switzerlandhttps://orcid.org/0000-0003-0479-4488
Kuchar, AlesFaculty of Physics and Earth Sciences, Leipzig Institute for Meteorology (LIM), Leipzig, Germanyhttps://orcid.org/0000-0002-3672-6626
Ball, WilliamDepartment of Geoscience and Remote Sensing, TU Delft, Delft, the Netherlandshttps://orcid.org/0000-0002-1005-3670
Arsenovic, PavleSwiss Federal Laboratories for Materials Science and Technology (EMPA), Dübendorf, Switzerlandhttps://orcid.org/0000-0001-8844-7007
Remsberg, EllisScience Directorate, NASA Langley Research Center, Hampton, Virginia, USAhttps://orcid.org/0000-0002-6452-2794
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Kunze, MarkusInstitut für Meteorologie, Freie Universität Berlin, 12165 Berlin, Germanyhttps://orcid.org/0000-0002-9608-1823
Plummer, David A.Climate Research Division, Environment and Climate Change Canada, Montreal, Canadahttps://orcid.org/0000-0001-8087-3976
Stenke, AndreaThe Institute for Atmospheric and Climate Science (IAC), ETH Zurich, Zurich, Switzerlandhttps://orcid.org/0000-0002-5916-4013
Marsh, DanielNational Center for Atmospheric Research, Boulder, Colorado, USAUNSPECIFIED
Kinnison, DougNational Center for Atmospheric Research, Boulder, Colorado, USAUNSPECIFIED
Peter, ThomasThe Institute for Atmospheric and Climate Science (IAC), ETH Zurich, Zurich, SwitzerlandUNSPECIFIED
Date:11 January 2021
Journal or Publication Title:Atmospheric Chemistry and Physics (ACP)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 201-216
Publisher:Copernicus Publications
Keywords:water vapour, carbon monoxide, upper atmosphere, mesosphere, chemistry climate modeling, MESSy, EMAC, ESCiMo, Earth System Chemistry Integrated Modelling, CCMI, chemistry climate initiative
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:13 Jan 2021 09:27
Last Modified:13 Jan 2021 09:27

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