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

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

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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.

Document Type:Article
Title:Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models
AuthorsInstitution or Email of Authors
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
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-15
Keywords:numerical modeling, stratosphere, troposphere, climate change
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: Prof. Dr. rer. nat. Martin Dameris
Deposited On:27 Sep 2010 12:07
Last Modified:23 Jan 2014 11:36

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