Seasonal variations of stratospheric age spectra in the Goddard Earth Observing System Chemistry Climate Model (GEOSCCM)

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dc.contributor.authorLi, Feng
dc.contributor.authorWaugh, Darryn W.
dc.contributor.authorDouglass, Anne R.
dc.contributor.authorNewman, Paul A.
dc.contributor.authorPawson, Steven
dc.contributor.authorStolarski, Richard S.
dc.contributor.authorStrahan, Susan E.
dc.contributor.authorNielsen, J. Eric
dc.date.accessioned2023-01-30T17:29:01Z
dc.date.available2023-01-30T17:29:01Z
dc.date.issued2012-03-15
dc.description.abstractThe stratospheric age spectrum is the probability distribution function of the transit times since a stratospheric air parcel had last contact with a tropospheric boundary region. Previous age spectrum studies have focused on its annual mean properties. Knowledge of the age spectrum's seasonal variability is very limited. In this study, we investigate the seasonal variations of the stratospheric age spectra using the pulse tracer method in the Goddard Earth Observing System Chemistry Climate Model (GEOSCCM). The relationships between the age spectrum and the boundary impulse response (BIR) are reviewed, and a simplified method to reconstruct seasonally varying age spectra is introduced. The age spectra in GEOSCCM have strong seasonal cycles, especially in the lowermost and lower stratosphere and in the subtropical overworld. These changes reflect the seasonal evolution of the Brewer-Dobson circulation, isentropic mixing, and transport barriers. We also investigate the seasonal and interannual variations of the BIRs. Our results clearly show that computing an ensemble of seasonally dependent BIRs is necessary in order to capture the seasonal and annual mean properties of the stratospheric age spectrum.en_US
dc.description.sponsorshipThis work is supported by NASA's Modeling, Analysis, and Prediction program. We thank Laura Pan for very helpful discussions. Computational resources for this work were provided by NASA’s High-Performance Computing through the generous award of computing time at NASA Ames Research Center.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2011JD016877en_US
dc.format.extent14 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2wrc1-ixxq
dc.identifier.citationLi, F., D. W. Waugh, A. R. Douglass, P. A. Newman, S. Pawson, R. S. Stolarski, S. E. Strahan, and J. E. Nielsen(2012), Seasonal variations of stratospheric age spectra in the Goddard Earth Observing System Chemistry Climate Model(GEOSCCM),J. Geophys. Res.,117, D05134, doi:10.1029/2011JD016877.en_US
dc.identifier.urihttps://doi.org/10.1029/2011JD016877
dc.identifier.urihttp://hdl.handle.net/11603/26731
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.titleSeasonal variations of stratospheric age spectra in the Goddard Earth Observing System Chemistry Climate Model (GEOSCCM)en_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-7928-0775en_US

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