Assessment of the breakup of the Antarctic polar vortex in two new chemistry-climate models

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dc.contributor.authorHurwitz, M. M.
dc.contributor.authorNewman, P. A.
dc.contributor.authorLi, Feng
dc.contributor.authorOman, L. D.
dc.contributor.authorMorgenstern, O.
dc.contributor.authorBraesicke, P.
dc.contributor.authorPyle, J. A.
dc.date.accessioned2023-01-30T19:39:11Z
dc.date.available2023-01-30T19:39:11Z
dc.date.issued2010-04-14
dc.description.abstractSuccessful simulation of the breakup of the Antarctic polar vortex depends on the representation of tropospheric stationary waves at Southern Hemisphere middle latitudes. This paper assesses the vortex breakup in two new chemistry-climate models (CCMs). The stratospheric version of the UK Chemistry and Aerosols model is able to reproduce the observed timing of the vortex breakup. Version 2 of the Goddard Earth Observing System (GEOS V2) model is typical of CCMs in that the Antarctic polar vortex breaks up too late; at 10 hPa, the mean transition to easterlies at 60°S is delayed by 12–13 days as compared with the ERA-40 and National Centers for Environmental Prediction reanalyses. The two models' skill in simulating planetary wave driving during the October–November period accounts for differences in their simulation of the vortex breakup, with GEOS V2 unable to simulate the magnitude and tilt of geopotential height anomalies in the troposphere and thus underestimating the wave driving. In the GEOS V2 CCM the delayed breakup of the Antarctic vortex biases polar temperatures and trace gas distributions in the upper stratosphere in November and December.en_US
dc.description.sponsorshipThe authors thank the Chemistry-Climate Model Validation Activity (CCMVal) of World Climate Research Programme–Stratospheric Processes and their Role in Climate (WCRP–SPARC) for organizing the model data analysis activity. The UK MetOffice is acknowledged for use of the MetUM. Furthermore, the authors thank NASA's MAP program, E. Nash for providing the streamline plotting code, and J. E. Nielsen for running the GEOS V2 simulation. M. M. Hurwitz is supported by an appointment to the NASA Postdoctoral Program at Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. O. Morgenstern, P. Braesicke and J. A. Pyle are supported by the Natural Environmental Research Council through the NCAS initiative and by the European Commission under the Framework 6 SCOUT-O3 IP.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009JD012788en_US
dc.format.extent13 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2n0to-jepr
dc.identifier.citationHurwitz, M. M., P. A. Newman, F. Li, L. D. Oman, O. Morgenstern, P. Braesicke, and J. A. Pyle (2010), Assessmentof the breakup of the Antarctic polar vortex in two new chemistry‐climate models,J. Geophys. Res.,115, D07105,doi:10.1029/2009JD012788.en_US
dc.identifier.urihttps://doi.org/10.1029/2009JD012788
dc.identifier.urihttp://hdl.handle.net/11603/26736
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.titleAssessment of the breakup of the Antarctic polar vortex in two new chemistry-climate modelsen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-7928-0775en_US

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