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dc.contributor.authorLeibensperger, E
dc.contributor.authorMickley, Loretta J.
dc.contributor.authorJacob, Daniel J.
dc.contributor.authorChen, W.-T.
dc.contributor.authorSeinfeld, J. H.
dc.contributor.authorNenes, A.
dc.contributor.authorAdams, P. J.
dc.contributor.authorStreets, D. G.
dc.contributor.authorKumar, N.
dc.contributor.authorRind, D.
dc.date.accessioned2014-03-17T16:11:22Z
dc.date.issued2012
dc.identifier.citationLeibensperger, E. M., L. J. Mickley, D. J. Jacob, W.-T. Chen, J. H. Seinfeld, A. Nenes, P. J. Adams, D. G. Streets, N. Kumar, and D. Rind. 2012. Climatic Effects of 1950-2050 Changes in US Anthropogenic Aerosols - Part 2: Climate Response. Atmospheric Chemistry and Physics 12, no. 7: 3349–3362.en_US
dc.identifier.issn1680-7316en_US
dc.identifier.issn1680-7324en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:11918722
dc.description.abstractWe investigate the climate response to changing US anthropogenic aerosol sources over the 1950–2050 period by using the NASA GISS general circulation model (GCM) and comparing to observed US temperature trends. Time-dependent aerosol distributions are generated from the GEOS-Chem chemical transport model applied to historical emission inventories and future projections. Radiative forcing from US anthropogenic aerosols peaked in 1970–1990 and has strongly declined since due to air quality regulations. We find that the regional radiative forcing from US anthropogenic aerosols elicits a strong regional climate response, cooling the central and eastern US by 0.5–1.0 °C on average during 1970–1990, with the strongest effects on maximum daytime temperatures in summer and autumn. Aerosol cooling reflects comparable contributions from direct and indirect (cloud-mediated) radiative effects. Absorbing aerosol (mainly black carbon) has negligible warming effect. Aerosol cooling reduces surface evaporation and thus decreases precipitation along the US east coast, but also increases the southerly flow of moisture from the Gulf of Mexico resulting in increased cloud cover and precipitation in the central US. Observations over the eastern US show a lack of warming in 1960–1980 followed by very rapid warming since, which we reproduce in the GCM and attribute to trends in US anthropogenic aerosol sources. Present US aerosol concentrations are sufficiently low that future air quality improvements are projected to cause little further warming in the US (0.1 °C over 2010–2050). We find that most of the warming from aerosol source controls in the US has already been realized over the 1980–2010 period.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherEuropean Geosciences Unionen_US
dc.relation.isversionofdoi:10.5194/acp-12-3349-2012en_US
dc.relation.hasversionhttp://dspace.mit.edu/openaccess-disseminate/1721.1/74090en_US
dc.relation.hasversionhttp://acmg.seas.harvard.edu/publications/2012/leibensperger2012b.pdfen_US
dash.licenseLAA
dc.titleClimatic Effects of 1950-2050 Changes in US Anthropogenic Aerosols - Part 2: Climate Responseen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalAtmospheric Chemistry and Physicsen_US
dash.depositing.authorJacob, Daniel J.
dc.date.available2014-03-17T16:11:22Z
dc.identifier.doi10.5194/acp-12-3349-2012*
workflow.legacycommentsCCBY FAR 2013en_US
dash.contributor.affiliatedLeibensperger, Eric Michael
dash.contributor.affiliatedMickley, Loretta
dash.contributor.affiliatedJacob, Daniel


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