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A quasi chemistry-transport model mode for EMAC

Deckert, Rudolf and Jöckel, Patrick and Grewe, Volker and Gottschaldt, Klaus-Dirk and Hoor, Peter (2011) A quasi chemistry-transport model mode for EMAC. Geoscientific Model Development, 3, pp. 195-206. DOI: 10.5194/gmd-4-195-2011.

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Official URL: http://www.geosci-model-dev.net/4/195/2011/

Abstract

A quasi chemistry-transport model mode (QCTM) is presented for the numerical chemistry-climate simulation system ECHAM/MESSy Atmospheric Chemistry (EMAC). It allows for a quantification of chemical signals through suppression of any feedback between chemistry and dynamics. Noise would otherwise interfere too strongly. The signal follows from the difference of two QCTM simulations, reference and sensitivity. These are fed with offline chemical fields as a substitute of the feedbacks between chemistry and dynamics: offline mixing ratios of radiatively active substances enter the radiation scheme (a), offline mixing ratios of nitric acid enter the scheme for re-partitioning and sedimentation from polar stratospheric clouds (b). Offline methane oxidation is the exclusive source of chemical water-vapor tendencies (c). Any set of offline fields suffices to suppress the feedbacks, though may be inconsistent with the simulation setup. An adequate set of offline climatologies can be produced from a non-QCTM simulation of the reference setup. Test simulations reveal the particular importance of adequate offline fields associated with (a). Inconsistencies from (b) are negligible when using adequate fields of nitric acid. Acceptably small inconsistencies come from (c), but should vanish for an adequate prescription of water vapor tendencies. Toggling between QCTM and non-QCTM is done via namelist switches and does not require a source code re-compilation.

Document Type:Article
Title:A quasi chemistry-transport model mode for EMAC
Authors:
AuthorsInstitution or Email of Authors
Deckert, RudolfUNSPECIFIED
Jöckel, PatrickUNSPECIFIED
Grewe, VolkerUNSPECIFIED
Gottschaldt, Klaus-DirkUNSPECIFIED
Hoor, PeterUNSPECIFIED
Date:2011
Journal or Publication Title:Geoscientific Model Development
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:3
DOI:10.5194/gmd-4-195-2011
Page Range:pp. 195-206
Status:Published
Keywords:EMAC global chemistry climate modelling decoupling
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics, Transport
HGF - Program Themes:Earth Observation, ATM and Operation, Transport System
DLR - Research area:Raumfahrt, Aeronautics, Transport
DLR - Program:R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation, V VS - Verkehrssystem
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, L - Climate, Weather and Environment, V - Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Dr. Rudolf Deckert
Deposited On:06 Dec 2010 16:17
Last Modified:12 Dec 2013 21:08

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