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Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models

Gerber, Edwin P. und Baldwin, Mark P. und Akiyoshi, Hideharu und Austin, John und Bekki, Slimane und Braesicke, Peter und Butchart, Neal und Chipperfield, Martyn P. und Dameris, Martin und Dhomse, Sandip und Frith, Stacey M. und Garcia, Rolando R. und Garny, Hella und Gettelman, Andrew und Hardiman, Steven C. und Karpechko, Alexey und Marchand, Marion und Morgenstern, Olaf und Nielsen, J. Eric und Pawson, Steven und Peter, Tom und Plummer, David A. und Pyle, John A. und Rozanov, Eugene und Scinocca, John F. und Shepherd, Theodore G. und Smale, Dan (2010) Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models. Journal of Geophysical Research, 115 (D00M06), Seiten 1-15. DOI: doi:10.1029/2009JD013770.

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Offizielle URL: http://www.agu.org/pubs/crossref/2010/2009JD013770.shtml

Kurzfassung

The internal variability and coupling between the stratosphere and troposphere in CCMVal�2 chemistry�climate models are evaluated through analysis of the annular mode patterns of variability. Computation of the annular modes in long data sets with secular trends requires refinement of the standard definition of the annular mode, and a more robust procedure that allows for slowly varying trends is established and verified. The spatial and temporal structure of the models� annular modes is then compared with that of reanalyses. As a whole, the models capture the key features of observed intraseasonal variability, including the sharp vertical gradients in structure between stratosphere and troposphere, the asymmetries in the seasonal cycle between the Northern and Southern hemispheres, and the coupling between the polar stratospheric vortices and tropospheric midlatitude jets. It is also found that the annular mode variability changes little in time throughout simulations of the 21st century. There are, however, both common biases and significant differences in performance in the models. In the troposphere, the annular mode in models is generally too persistent, particularly in the Southern Hemisphere summer, a bias similar to that found in CMIP3 coupled climate models. In the stratosphere, the periods of peak variance and coupling with the troposphere are delayed by about a month in both hemispheres. The relationship between increased variability of the stratosphere and increased persistence in the troposphere suggests that some tropospheric biases may be related to stratospheric biases and that a well�simulated stratosphere can improve simulation of tropospheric intraseasonal variability.

Dokumentart:Zeitschriftenbeitrag
Titel:Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Gerber, Edwin P.Center of Atmosphere Ocean Science New York
Baldwin, Mark P.North Wets Research Associates, Redmond
Akiyoshi, HideharuNational Institute for Environmental Studies, Tsukuba, J
Austin, JohnUniv. of Princeton, Princeton, NJ, USA
Bekki, SlimaneCNRS, Paris, F
Braesicke, PeterUniv. of Cambridge, Cambridge, UK
Butchart, NealMet Office Hadley Centre, Exeter, UK
Chipperfield, Martyn P.Univ. of Leeds, Leeds, UK
Dameris, MartinDLR-PA
Dhomse, SandipUniv. of Leeds, Leeds, UK
Frith, Stacey M.Atmos. Chemistry and Dynamics Branch, Greenbelt, MD, USA
Garcia, Rolando R.NCAR, Boulder, CO, USA
Garny, HellaDLR-PA
Gettelman, AndrewNCAR, Boulder, CO, USA
Hardiman, Steven C.Met Office Hadley Centre, Exeter, UK
Karpechko, AlexeyFinnish Meteorological Inst., Helsinki, FIN
Marchand, MarionCNRS, Paris, F
Morgenstern, OlafNational Inst. of Water and Atmospheric Research, Lauder, NZ
Nielsen, J. EricSpace Science Applications Incorporated, Laurel, MD, USA
Pawson, StevenGlobal Modeling and Assimilation Office, Greenbelt, MD, USA
Peter, TomPMOD, Zurich, CH
Plummer, David A.Environment Canada, Montreal, Quebec, CND
Pyle, John A.Univ. of Cambridge, Cambridge, UK
Rozanov, EugenePMOD, Zurich, CH
Scinocca, John F.Environment Canada, Victoria, British Columbia, CND
Shepherd, Theodore G.Univ. of Toronto, Toronto, Ontario, CND
Smale, DanNational Inst. of Water and Atmospheric Research, Lauder, NZ
Datum:2010
Erschienen in:Journal of Geophysical Research
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:115
DOI :doi:10.1029/2009JD013770
Seitenbereich:Seiten 1-15
Status:veröffentlicht
Stichwörter:numerical modeling, stratosphere, troposphere, climate change
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: Prof. Dr. rer. nat. Martin Dameris
Hinterlegt am:27 Sep 2010 12:07
Letzte Änderung:23 Jan 2014 11:36

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