Effects of Greenhouse Gas Increase and Stratospheric Ozone Depletion on Stratospheric Mean Age of Air in 1960–2010

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dc.contributor.authorLi, Feng
dc.contributor.authorNewman, Paul
dc.contributor.authorPawson, Steven
dc.contributor.authorPerlwitz, Judith
dc.date.accessioned2023-01-30T16:44:32Z
dc.date.available2023-01-30T16:44:32Z
dc.date.issued2018-02-10
dc.description.abstractThe relative impacts of greenhouse gas (GHG) increase and stratospheric ozone depletion onstratospheric mean age of air in the 1960–2010 period are quantified using the Goddard Earth ObservingSystem Chemistry-Climate Model. The experiment compares controlled simulations using a coupledatmosphere-ocean version of the Goddard Earth Observing System Chemistry-Climate Model, in which eitherGHGs or ozone depleting substances, or both factors evolve over time. The model results show that GHGsand ozone depleting substances have about equal contributions to the simulated mean age decrease, butGHG increases account for about two thirds of the enhanced strength of the lower stratospheric residualcirculation. It is also found that both the acceleration of the diabatic circulation and the decrease of the meanage difference between downwelling and upwelling regions are mainly caused by GHG forcing. The resultsshow that ozone depletion causes an increase in the mean age of air in the Antarctic summer lowerstratosphere through two processes: (1) a seasonal delay in the Antarctic polar vortex breakup that inhibitsyoung midlatitude air from mixing with the older air inside the vortex, and (2) enhanced Antarcticdownwelling that brings older air from middle and upper stratosphere into the lower stratosphere.en_US
dc.description.sponsorshipThis work was supported by NASA’sModeling, Analysis and PredictionProgram (MAP) under grantsNNX13AN98G and NNX13AM24G. NASACenter for Climate Simulation (NCCS)provided computational resources forthis work. The simulations used in thisstudy are stored in the data-storagefacilities at NCCS and are fully availableupon a request to F. L. (feng.li@nasa.gov).en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JD027562en_US
dc.format.extent13 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2bcyl-hyua
dc.identifier.citationLi, F., Newman, P., Pawson, S., &Perlwitz, J. (2018). Effects of greenhousegas increase and stratospheric ozonedepletion on stratospheric mean age ofair in 1960–2010.Journal of GeophysicalResearch: Atmospheres,123, 2098–2110. https://doi.org/10.1002/2017JD027562.en_US
dc.identifier.urihttps://doi.org/10.1002/2017JD027562
dc.identifier.urihttp://hdl.handle.net/11603/26723
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC GESTAR II 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.titleEffects of Greenhouse Gas Increase and Stratospheric Ozone Depletion on Stratospheric Mean Age of Air in 1960–2010en_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-7928-0775en_US

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