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A modeling study on the climate impacts of black carbon aerosols

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dc.contributor Wang, Chien. en_US 2003-10-24T14:55:47Z 2003-10-24T14:55:47Z 2002-03 en_US
dc.identifier.other no. 84 en_US
dc.identifier.uri en_US
dc.description Abstract in HTML and technical report in PDF available on the Massachusetts Institute of Technology Joint Program on the Science and Policy of Global Change Website. ( en_US
dc.description Includes bibliographical references (p. 18-19). en_US
dc.description.abstract The role of black carbon (BC) aerosols in climate change is important because of its strong capability in causing extinction of solar radiation. A three-dimensional interactive aerosol-climate model has been used to study the climatic impact of BC. The interannual variations of BC solar forcing derived from 20-year transient integrations are up to 4 times as large as the means mainly related to changes in cloud cover, snow depth (about +/- 20% over many high- or even mid-latitude regions in Northern Hemisphere) and thus the surface albedo, all caused by BC solar forcing itself. With an absolute amount three times higher than that of the top of the atmosphere (TOA) forcing, the surface forcing of BC is an extremely important factor in analyzing the climate impact of BC. BC aerosols cause a “cloud burning” effect in several polluted regions and a “cloud enhancing” effect in some high-latitude sites. Combined with BC-caused changes in surface albedo, this is defined as a non-Twomey-Albrecht indirect forcing by BC, which alters the radiative budgets by changing cloud cover and some land-surface properties thermodynamically rather than microphysically. The result of this study does not indicate that BC aerosols contribute to a significant increase in land-surface temperature with annual emissions of 14 TgC. The calculated surface temperature change is determined by a subtle balance among changes in surface energy sources and sinks as well as changes in the hydrological cycle, all caused by BC radiative forcing. The result of this study shows that the influence of BC aerosols on climate and environment at the regional scale is more significant than at the global scale. Several important feedbacks between BC radiative effect and climate dynamics revealed in this study suggest the importance of using interactive aerosol-climate models to address the issues related to the climate impacts of aerosols. en_US
dc.description.sponsorship Supported by the industrial consortium of the MIT Joint Program on the Science and Policy of Global Change and by the DOE DE-FG02-94ER61937 DE-FG02-93ER61713 en_US
dc.format.extent 19 p. en_US
dc.format.extent 1946078 bytes
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher MIT Joint Program on the Science and Policy of Global Change en_US
dc.relation.ispartofseries Report no. 84 en_US
dc.rights.uri en_US
dc.subject.lcc QC981.8.C5.M58 no.84 en_US
dc.title A modeling study on the climate impacts of black carbon aerosols en_US

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