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

Edwin Gerber, Mark P. Baldwin, Hideharu Akiyoshi, John Austin, Slimane Bekki, Peter Braesicke, Neal Butchart, Martyn Chipperfield, Martin Dameris, Sandip Dhomse, Stacey M. Frith, Rolando R. Garcia, Hella Garny, Andrew Gettelman, Steven C. Hardiman, Alexey Karpechko, Marion Marchand, Olaf Morgenstern, J. Eric Nielsen, Steven Pawson & 7 others Tom Peter, David A. Plummer, John A. Pyle, Eugene Rozanov, John F. Scinocca, Theodore G. Shepherd, Dan Smale

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Article numberD00M06
JournalJournal of Geophysical Research: Space Physics
Volume115
Issue number18
DOIs
StatePublished - 2010

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climate models
stratosphere
troposphere
climate modeling
chemistry
Southern Hemisphere
trends
twenty first century
temperate regions
simulation
vortex
Northern Hemisphere
hemispheres
asymmetry
persistence
summer
vortices
gradients
cycles
trend

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models. / Gerber, Edwin; Baldwin, Mark P.; Akiyoshi, Hideharu; Austin, John; Bekki, Slimane; Braesicke, Peter; Butchart, Neal; Chipperfield, Martyn; Dameris, Martin; Dhomse, Sandip; Frith, Stacey M.; Garcia, Rolando R.; Garny, Hella; Gettelman, Andrew; Hardiman, Steven C.; Karpechko, Alexey; Marchand, Marion; Morgenstern, Olaf; Nielsen, J. Eric; Pawson, Steven; Peter, Tom; Plummer, David A.; Pyle, John A.; Rozanov, Eugene; Scinocca, John F.; Shepherd, Theodore G.; Smale, Dan.

In: Journal of Geophysical Research: Space Physics, Vol. 115, No. 18, D00M06, 2010.

Research output: Contribution to journalArticle

Gerber, E, Baldwin, MP, Akiyoshi, H, Austin, J, Bekki, S, Braesicke, P, Butchart, N, Chipperfield, M, Dameris, M, Dhomse, S, Frith, SM, Garcia, RR, Garny, H, Gettelman, A, Hardiman, SC, Karpechko, A, Marchand, M, Morgenstern, O, Nielsen, JE, Pawson, S, Peter, T, Plummer, DA, Pyle, JA, Rozanov, E, Scinocca, JF, Shepherd, TG & Smale, D 2010, 'Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models', Journal of Geophysical Research: Space Physics, vol. 115, no. 18, D00M06. https://doi.org/10.1029/2009JD013770
Gerber, Edwin ; Baldwin, Mark P. ; Akiyoshi, Hideharu ; Austin, John ; Bekki, Slimane ; Braesicke, Peter ; Butchart, Neal ; Chipperfield, Martyn ; Dameris, Martin ; Dhomse, Sandip ; Frith, Stacey M. ; Garcia, Rolando R. ; Garny, Hella ; Gettelman, Andrew ; Hardiman, Steven C. ; Karpechko, Alexey ; Marchand, Marion ; Morgenstern, Olaf ; Nielsen, J. Eric ; Pawson, Steven ; Peter, Tom ; Plummer, David A. ; Pyle, John A. ; Rozanov, Eugene ; Scinocca, John F. ; Shepherd, Theodore G. ; Smale, Dan. / Stratosphere-troposphere coupling and annular mode variability in chemistry-climate models. In: Journal of Geophysical Research: Space Physics. 2010 ; Vol. 115, No. 18.
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AU - Baldwin, Mark P.

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AU - Braesicke, Peter

AU - Butchart, Neal

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AU - Dhomse, Sandip

AU - Frith, Stacey M.

AU - Garcia, Rolando R.

AU - Garny, Hella

AU - Gettelman, Andrew

AU - Hardiman, Steven C.

AU - Karpechko, Alexey

AU - Marchand, Marion

AU - Morgenstern, Olaf

AU - Nielsen, J. Eric

AU - Pawson, Steven

AU - Peter, Tom

AU - Plummer, David A.

AU - Pyle, John A.

AU - Rozanov, Eugene

AU - Scinocca, John F.

AU - Shepherd, Theodore G.

AU - Smale, Dan

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