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Long-term changes and variability in a transient simulation with a chemistry-climate model employing realistic forcing

Dameris, Martin and Grewe, Volker and Ponater, Michael and Deckert, Rudolf and Eyring, Veronika and Mager, Fabian and Matthes, Sigrun and Schnadt, Christina and Stenke, Andrea and Steil, Benedikt and Brühl, Christoph and Giorgetta, Marco (2005) Long-term changes and variability in a transient simulation with a chemistry-climate model employing realistic forcing. Atmospheric Chemistry and Physics, 5, pp. 2121-2145.

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Official URL: http://www.atmos-chem-phys.org/acp/5/2121/


A transient simulation with the interactively coupled chemistry-climate model (CCM) E39/C has been carried out which covers the 40-year period between 1960 and 1999. Forcing of natural and anthropogenic origin is prescribed where the characteristics are sufficiently well known and the typical timescales are slow compared to synoptic timescale so that the simulated atmospheric chemistry and climate evolve under a “slowly” varying external forcing. Based on observations, sea surface temperature (SST) and ice cover are prescribed. The increase of greenhouse gas and chlorofluorocarbon concentrations, as well as nitrogen oxide emissions are taken into account. The 11-year solar cycle is considered in the calculation of heating rates and photolysis of chemical species. The three major volcanic eruptions during that time (Agung, 1963; El Chichon, 1982; Pinatubo, 1991) are considered. The quasi-biennial oscillation (QBO) is forced by linear relaxation, also known as nudging, of the equatorial zonal wind in the lower stratosphere towards observed zonal wind profiles. Beyond a reasonable reproduction of mean parameters and long-term variability characteristics there are many apparent features of episodic similarities between simulation and observation: In the years 1986 and 1988 the Antarctic ozone holes are smaller than in the other years of that decade. In mid-latitudes of the Southern Hemisphere ozone anomalies resemble the corresponding observations, especially in 1985, 1989, 1991/1992, and 1996. In the Northern Hemisphere, the episode between the late 1980s and the first half of the 1990s is dynamically quiet, in particular, no stratospheric warming is found between 1988 and 1993. As observed, volcanic eruptions strongly influence dynamics and chemistry, though only for few years. Obviously, planetary wave activity is strongly driven by the prescribed SST and modulated by the QBO. Preliminary evidence of realistic cause and effect relationships strongly suggests that detailed process-oriented studies will be a worthwhile endeavour.

Document Type:Article
Title:Long-term changes and variability in a transient simulation with a chemistry-climate model employing realistic forcing
AuthorsInstitution or Email of Authors
Dameris, MartinUNSPECIFIED
Ponater, MichaelUNSPECIFIED
Deckert, RudolfUNSPECIFIED
Eyring, VeronikaUNSPECIFIED
Matthes, SigrunUNSPECIFIED
Schnadt, ChristinaUNSPECIFIED
Steil, BenediktMPI für Chemie, Mainz
Brühl, ChristophMPI für Chemie, Mainz
Giorgetta, MarcoMPI für Meteorologie, Hamburg
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 2121-2145
Keywords:dynamics and chemistry of the stratosphere, ozone layer
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Dr. Christian Kurz
Deposited On:26 Sep 2007
Last Modified:11 Nov 2014 21:56

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