Relationships between the Brewer-Dobson circulation and the southern annular mode during austral summer in coupled chemistry-climate model simulations

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dc.contributor.authorLi, Feng
dc.contributor.authorNewman, Paul A.
dc.contributor.authorStolarski, Richard S.
dc.date.accessioned2023-01-30T19:37:16Z
dc.date.available2023-01-30T19:37:16Z
dc.date.issued2010-08-06
dc.description.abstractThe Brewer-Dobson circulation (BDC) is the mean meridional mass circulation in the stratosphere and the southern annular mode (SAM) is the prime variability pattern of the Southern Hemisphere extratropical troposphere. Motivated by previous studies showing that both the strengths of the BDC and the SAM have the largest trends in the austral summer in the recent past, this paper investigates the relationships between the BDC and the SAM using coupled chemistry-climate model simulations. The model results show that the strengthening of the BDC in the Southern Hemisphere during November–February (NDJF) is strongly projected onto the high index of the SAM. The trends in the BDC and the SAM are driven by Antarctic ozone depletion, which increases stratosphere-troposphere interactions through a delayed Antarctic vortex breakup. The prolonged persistence of stratospheric westerlies enhances upward propagation of tropospheric wave activity into the stratosphere and strengthens the BDC. The wave flux and westerly anomalies in the stratosphere in turn drive a SAM trend toward its high index. Model results also show that the BDC-SAM relationship is robust on the interannual time scale.en_US
dc.description.sponsorshipThis work was supported by NASA's Modeling and Analysis program. We thank three anonymous reviewers for their insightful comments. The NCEP Reanalysis 2 data are provided by the NOAA/OAR/ESRL PSD, Boulder, CO, USA, from their Web site at http://www.esrl.noaa.gov/psd/.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JD012876en_US
dc.format.extent12 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m25pvm-xqpe
dc.identifier.citationLi, F., P. A. Newman, and R. S. Stolarski (2010), Relationships between the Brewer‐Dobson circulation and thesouthern annular mode during austral summer in coupled chemistry‐climate model simulations,J. Geophys. Res.,115, D15106,doi:10.1029/2009JD012876.en_US
dc.identifier.urihttps://doi.org/10.1029/2009JD012876
dc.identifier.urihttp://hdl.handle.net/11603/26734
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleRelationships between the Brewer-Dobson circulation and the southern annular mode during austral summer in coupled chemistry-climate model simulationsen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-7928-0775en_US

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