Air-mass Origin in the Arctic. Part II: Response to Increases in Greenhouse Gases

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dc.contributor.authorORBE, CLARA
dc.contributor.authorEWMAN, PAUL A.
dc.contributor.authorWAUGH, DARRYN W.
dc.contributor.authorHOLZER, MARK
dc.contributor.authorOMAN, LUKE D.
dc.contributor.authorLI, FENG
dc.contributor.authorPOLVANI, LORENZO M.
dc.date.accessioned2023-01-30T16:46:57Z
dc.date.available2023-01-30T16:46:57Z
dc.date.issued2015-12-01
dc.description.abstractFuture changes in transport from Northern Hemisphere (NH) midlatitudes into the Arctic are examined using rigorously defined air-mass fractions that partition air in the Arctic according to where it last had contact with the planetary boundary layer (PBL). Boreal winter (December–February) and summer (June–August) air-mass fraction climatologies are calculated for the modeled climate of the Goddard Earth Observing System Chemistry–Climate Model (GEOSCCM) forced with the end-of-twenty-first century greenhouse gases and ozone-depleting substances. The modeled projections indicate that the fraction of air in the Arctic that last contacted the PBL over NH midlatitudes (or air of ‘‘midlatitude origin’’) will increase by about 10% in both winter and summer. The projected increases during winter are largest in the upper and middle Arctic troposphere, where they reflect an upward and poleward shift in the transient eddy meridional wind, a robust dynamical response among comprehensive climate models. The boreal winter response is dominated by (;5%–10%) increases in the air-mass fractions originating over the eastern Pacific and the Atlantic, while the response in boreal summer mainly reflects (;5%) increases in air of Asian and North American origin. The results herein suggest that future changes in transport from midlatitudes may impact the composition—and, hence, radiative budget—in the Arctic, independent of changes in emissions.en_US
dc.description.sponsorshipThis research was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA. The authors also acknowledge support from ARC Grant DP120100674 (M.H.) and NSF Grants AGS1403676 (D.W.) and AGS-1402931 (M.H., L.M.P.).en_US
dc.description.urihttps://journals.ametsoc.org/view/journals/clim/28/23/jcli-d-15-0296.1.xml?tab_body=pdfen_US
dc.format.extent16 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2jqep-kp3u
dc.identifier.citationOrbe, Clara, Paul A. Newman, Darryn W. Waugh, Mark Holzer, Luke D. Oman, Feng Li, and Lorenzo M. Polvani. "Air-mass Origin in the Arctic. Part II: Response to Increases in Greenhouse Gases", Journal of Climate 28, 23 (2015): 9105-9120, accessed Jan 11, 2023, https://doi.org/10.1175/JCLI-D-15-0296.1en_US
dc.identifier.urihttps://doi.org/10.1175/JCLI-D-15-0296.1
dc.identifier.urihttp://hdl.handle.net/11603/26726
dc.language.isoen_USen_US
dc.publisherAMSen_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.titleAir-mass Origin in the Arctic. Part II: Response to Increases in Greenhouse Gasesen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-7928-0775en_US

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