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The 1-way on-line coupled model system MECO(n) – Part 4: Chemical evaluation (based on MESSy v2.52)

Mertens, Mariano and Kerkweg, Astrid and Jöckel, Patrick and Tost, Holger and Hofmann, Christiane (2016) The 1-way on-line coupled model system MECO(n) – Part 4: Chemical evaluation (based on MESSy v2.52). Geoscientific Model Development, pp. 3545-3567. Copernicus Publications. DOI: 10.5194/gmd-9-3545-2016 ISSN 1991-959X

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Official URL: http://www.geosci-model-dev.net/9/3545/2016/gmd-9-3545-2016.html

Abstract

For the first time, a simulation incorporating tropospheric and stratospheric chemistry using the newly developed MECO(n) model system is performed. MECO(n) is short for MESSy-fied ECHAM and COSMO models nested n times. It features an online coupling of the COSMO-CLM model, equipped with the Modular Earth Submodel System (MESSy) interface (called COSMO/MESSy), with the global atmospheric chemistry model ECHAM5/MESSy for Atmospheric Chemistry (EMAC). This online coupling allows a consistent model chain with respect to chemical and meteorological boundary conditions from the global scale down to the regional kilometre scale. A MECO(2) simulation incorporating one regional instance over Europe with 50 km resolution and one instance over Germany with 12 km resolution is conducted for the evaluation of MECO(n) with respect to tropospheric gas-phase chemistry. The main goal of this evaluation is to ensure that the chemistry-related MESSy submodels and the online coupling with respect to the chemistry are correctly implemented. This evaluation is a prerequisite for the further usage of MECO(n) in atmospheric chemistry-related studies. Results of EMAC and the two COSMO/MESSy instances are compared with satellite, ground-based and aircraft in situ observations, focusing on ozone, carbon monoxide and nitrogen dioxide. Further, the methane lifetimes in EMAC and the two COSMO/MESSy instances are analysed in view of the tropospheric oxidation capacity. From this evaluation, we conclude that the chemistry-related submodels and the online coupling with respect to the chemistry are correctly implemented. In comparison with observations, both EMAC and COSMO/MESSy show strengths and weaknesses. Especially in comparison to aircraft in situ observations, COSMO/MESSy shows very promising results. However, the amplitude of the diurnal cycle of ground-level ozone measurements is underestimated. Most of the differences between COSMO/MESSy and EMAC can be attributed to differences in the dynamics of both models, which are subject to further model developments.

Item URL in elib:https://elib.dlr.de/106396/
Document Type:Article
Title:The 1-way on-line coupled model system MECO(n) – Part 4: Chemical evaluation (based on MESSy v2.52)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mertens, MarianoDLR, IPAhttps://orcid.org/0000-0003-3549-6889
Kerkweg, Astridkerkweg (at) uni-bonn.deUNSPECIFIED
Jöckel, PatrickDLR, IPAUNSPECIFIED
Tost, Holgertosth (at) uni-mainz.deUNSPECIFIED
Hofmann, Christianehofmach (at) uni-mainz.deUNSPECIFIED
Date:4 October 2016
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
DOI :10.5194/gmd-9-3545-2016
Page Range:pp. 3545-3567
Publisher:Copernicus Publications
ISSN:1991-959X
Status:Published
Keywords:COSMO EMAC Evaluation Chemistry
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 - Verkehrsentwicklung und Umwelt II (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Mertens, Mariano
Deposited On:06 Oct 2016 07:12
Last Modified:02 May 2019 14:14

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