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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. Wiley. DOI: doi:10.1029/2009JD013770

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

Abstract

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.

Item URL in elib:https://elib.dlr.de/65332/
Document Type:Article
Title:Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gerber, Edwin P.Center of Atmosphere Ocean Science New YorkUNSPECIFIED
Baldwin, Mark P.North Wets Research Associates, RedmondUNSPECIFIED
Akiyoshi, HideharuNational Institute for Environmental Studies, Tsukuba, JUNSPECIFIED
Austin, JohnUniv. of Princeton, Princeton, NJ, USAUNSPECIFIED
Bekki, SlimaneCNRS, Paris, FUNSPECIFIED
Braesicke, PeterUniv. of Cambridge, Cambridge, UKUNSPECIFIED
Butchart, NealMet Office Hadley Centre, Exeter, UKUNSPECIFIED
Chipperfield, Martyn P.Univ. of Leeds, Leeds, UKUNSPECIFIED
Dameris, MartinDLR-PAUNSPECIFIED
Dhomse, SandipUniv. of Leeds, Leeds, UKUNSPECIFIED
Frith, Stacey M.Atmos. Chemistry and Dynamics Branch, Greenbelt, MD, USAUNSPECIFIED
Garcia, Rolando R.NCAR, Boulder, CO, USAUNSPECIFIED
Garny, HellaDLR-PAUNSPECIFIED
Gettelman, AndrewNCAR, Boulder, CO, USAUNSPECIFIED
Hardiman, Steven C.Met Office Hadley Centre, Exeter, UKUNSPECIFIED
Karpechko, AlexeyFinnish Meteorological Inst., Helsinki, FINUNSPECIFIED
Marchand, MarionCNRS, Paris, FUNSPECIFIED
Morgenstern, OlafNational Inst. of Water and Atmospheric Research, Lauder, NZUNSPECIFIED
Nielsen, J. EricSpace Science Applications Incorporated, Laurel, MD, USAUNSPECIFIED
Pawson, StevenGlobal Modeling and Assimilation Office, Greenbelt, MD, USAUNSPECIFIED
Peter, TomPMOD, Zurich, CHUNSPECIFIED
Plummer, David A.Environment Canada, Montreal, Quebec, CNDUNSPECIFIED
Pyle, John A.Univ. of Cambridge, Cambridge, UKUNSPECIFIED
Rozanov, EugenePMOD, Zurich, CHUNSPECIFIED
Scinocca, John F.Environment Canada, Victoria, British Columbia, CNDUNSPECIFIED
Shepherd, Theodore G.Univ. of Toronto, Toronto, Ontario, CNDUNSPECIFIED
Smale, DanNational Inst. of Water and Atmospheric Research, Lauder, NZUNSPECIFIED
Date:2010
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:115
DOI :doi:10.1029/2009JD013770
Page Range:pp. 1-15
Publisher:Wiley
Status:Published
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: Dameris, Prof. Dr. rer. nat. Martin
Deposited On:27 Sep 2010 12:07
Last Modified:31 Jul 2019 19:28

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