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

Dameris, Martin und Grewe, Volker und Ponater, Michael und Deckert, Rudolf und Eyring, Veronika und Mager, Fabian und Matthes, Sigrun und Schnadt, Christina und Stenke, Andrea und Steil, Benedikt und Brühl, Christoph und 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, Seiten 2121-2145.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Long-term changes and variability in a transient simulation with a chemistry-climate model employing realistic forcing
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Dameris, MartinNICHT SPEZIFIZIERT
Grewe, VolkerNICHT SPEZIFIZIERT
Ponater, MichaelNICHT SPEZIFIZIERT
Deckert, RudolfNICHT SPEZIFIZIERT
Eyring, VeronikaNICHT SPEZIFIZIERT
Mager, FabianNICHT SPEZIFIZIERT
Matthes, SigrunNICHT SPEZIFIZIERT
Schnadt, ChristinaNICHT SPEZIFIZIERT
Stenke, AndreaNICHT SPEZIFIZIERT
Steil, BenediktMPI für Chemie, Mainz
Brühl, ChristophMPI für Chemie, Mainz
Giorgetta, MarcoMPI für Meteorologie, Hamburg
Datum:2005
Erschienen in:Atmospheric Chemistry and Physics
Referierte Publikation:Ja
In Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:5
Seitenbereich:Seiten 2121-2145
Status:veröffentlicht
Stichwörter:dynamics and chemistry of the stratosphere, ozone layer
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Dynamik der Atmosphäre
Hinterlegt von: Dr. Christian Kurz
Hinterlegt am:26 Sep 2007
Letzte Änderung:11 Nov 2014 21:56

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