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Methane chemistry in a nutshell - the new submodels CH4 (v1.0) and TRSYNC (v1.0) in MESSy (v2.54.0)

Winterstein, Franziska and Jöckel, Patrick (2021) Methane chemistry in a nutshell - the new submodels CH4 (v1.0) and TRSYNC (v1.0) in MESSy (v2.54.0). Geoscientific Model Development, 14 (2), pp. 661-674. Copernicus Publications. doi: 10.5194/gmd-14-661-2021. ISSN 1991-959X.

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Official URL: https://gmd.copernicus.org/articles/14/661/2021/

Abstract

Climate projections including chemical feedbacks rely on state-of-the-art chemistry-climate models (CCMs). Of particular importance is the role of methane (CH4) for the budget of stratospheric water vapour (SWV), which has an important climate impact. However, simulations with CCMs are, due to the large number of involved chemical species, computationally demanding, which limits the simulation of sensitivity studies. To allow for sensitivity studies and ensemble simulations with a reduced demand for computational resources, we introduce a simplified approach to simulate the core of methane chemistry in form of the new Modular Earth Submodel System (MESSy) submodel CH4. It involves an atmospheric chemistry mechanism reduced to the sink reactions of CH4 with predefined fields of the hydroxyl radical (OH), excited oxygen (O(1D)), and chlorine (Cl), as well as photolysis and the reaction products limited to water vapour (H2O). This chemical production of H2O is optionally fed back onto the specific humidity (q) of the connected general circulation model (GCM), to account for the impact onto SWV and its effect on radiation and stratospheric dynamics. The submodel CH4 is further capable of simulating the four most prevalent CH4 isotopologues for carbon and hydrogen (CH4 and CH3D, as well as 12CH4 and 13CH4). Furthermore, the production of deuterated water vapour (HDO) is, similar to the production of H2O in the CH4 oxidation, optionally passed back to the isotopological hydrological cycle simulated by the submodel H2OISO, using the newly developed auxiliary submodel TRSYNC. Moreover, the simulation of a user-defined number of diagnostic CH4 age and emission classes is possible, the output of which can be used for offline inverse optimization techniques. The presented approach combines the most important chemical hydrological feedback including the isotopic signatures with the advantages concerning the computational simplicity of a GCM, in comparison to a full-featured CCM.

Item URL in elib:https://elib.dlr.de/140759/
Document Type:Article
Title:Methane chemistry in a nutshell - the new submodels CH4 (v1.0) and TRSYNC (v1.0) in MESSy (v2.54.0)
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Winterstein, FranziskaDLR, IPAhttps://orcid.org/0000-0002-2406-4936
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Date:2 February 2021
Journal or Publication Title:Geoscientific Model Development
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:14
DOI :10.5194/gmd-14-661-2021
Page Range:pp. 661-674
Publisher:Copernicus Publications
ISSN:1991-959X
Status:Published
Keywords:Methane CH4 Model
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
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Winterstein, Dr. Franziska
Deposited On:03 Feb 2021 14:19
Last Modified:03 Feb 2021 14:19

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