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Description and Evaluation of the specified-dynamics experiment in the Chemistry-Climate Model Initiative

Orbe, Clara and Plummer, David A. and Waugh, Darryn W. and Yang, Huang and Jöckel, Patrick and Kinnison, Douglas E. and Josse, Beatrice and Marécal, Virginie and Deushi, Makoto and Abraham, Nathan L. and Archibald, Alexander T. and Chipperfield, Martyn P. and Dhomse, Sandip and Feng, Wuhu and Bekki, Slimane (2020) Description and Evaluation of the specified-dynamics experiment in the Chemistry-Climate Model Initiative. Atmospheric Chemistry and Physics (ACP), 20 (6), pp. 3809-3840. Copernicus Publications. doi: 10.5194/acp-20-3809-2020. ISSN 1680-7316.

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Official URL: https://www.atmos-chem-phys.net/20/3809/2020/


We provide an overview of the REF-C1SD specified-dynamics experiment that was conducted as part of phase 1 of the Chemistry-Climate Model Initiative (CCMI). The REF-C1SD experiment, which consisted of mainly nudged general circulation models (GCMs) constrained with (re)analysis fields, was designed to examine the influence of the large-scale circulation on past trends in atmospheric composition. The REF-C1SD simulations were produced across various model frameworks and are evaluated in terms of how well they represent different measures of the dynamical and transport circulations. In the troposphere there are large (∼40 %) differences in the climatological mean distributions, seasonal cycle amplitude, and trends of the meridional and vertical winds. In the stratosphere there are similarly large (∼50 %) differences in the magnitude, trends and seasonal cycle amplitude of the transformed Eulerian mean circulation and among various chemical and idealized tracers. At the same time, interannual variations in nearly all quantities are very well represented, compared to the underlying reanalyses. We show that the differences in magnitude, trends and seasonal cycle are not related to the use of different reanalysis products; rather, we show they are associated with how the simulations were implemented, by which we refer both to how the large-scale flow was prescribed and to biases in the underlying free-running models. In most cases these differences are shown to be as large or even larger than the differences exhibited by free-running simulations produced using the exact same models, which are also shown to be more dynamically consistent. Overall, our results suggest that care must be taken when using specified-dynamics simulations to examine the influence of large-scale dynamics on composition.

Item URL in elib:https://elib.dlr.de/134560/
Document Type:Article
Title:Description and Evaluation of the specified-dynamics experiment in the Chemistry-Climate Model Initiative
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Orbe, ClaraNASA Goddard, New York, NY, USAUNSPECIFIED
Plummer, David A.ECCC, Montreal, Kanadahttps://orcid.org/0000-0001-8087-3976
Waugh, Darryn W.Univ. Baltimore, MD, USAhttps://orcid.org/0000-0001-7692-2798
Yang, HuangUniv. Baltimore, MD, USAhttps://orcid.org/0000-0002-5693-0392
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Kinnison, Douglas E.NCAR, Boulder, CO, USAUNSPECIFIED
Josse, BeatriceCNRM, Toulouse, FrankreichUNSPECIFIED
Marécal, VirginieCNRM, Toulouse, FrankreichUNSPECIFIED
Deushi, MakotoMRI, Tsukuba, JapanUNSPECIFIED
Abraham, Nathan L.Univ. Cambridge, UKhttps://orcid.org/0000-0003-3750-3544
Archibald, Alexander T.Univ. Cambridge, UKhttps://orcid.org/0000-0001-9302-4180
Chipperfield, Martyn P.Univ. Leeds, UKhttps://orcid.org/0000-0002-6803-4149
Dhomse, SandipUniv. Leeds, UKhttps://orcid.org/0000-0003-3854-5383
Feng, WuhuUniv. Leeds, UKhttps://orcid.org/0000-0002-9907-9120
Bekki, SlimaneLMD/IPSL, Palaiseau, Frankreichhttps://orcid.org/0000-0002-5538-0800
Date:31 March 2020
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
DOI :10.5194/acp-20-3809-2020
Page Range:pp. 3809-3840
Publisher:Copernicus Publications
Keywords:EMAC, MESSy. CCMI, Chemistry Climate Modelling, Specified Dynamics, ESCiMo
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
Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:01 Apr 2020 10:49
Last Modified:13 Jan 2021 20:22

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