Single-scattering albedo and radiative forcing of various aerosol species with a global three-dimensional model

Toshihiko Takemura, Teruyuki Nakajima, Oleg Dubovik, Brent N. Holben, Stefan Kinne

研究成果: Contribution to journalArticle

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Global distributions of the aerosol optical thickness, Ångström exponent, and single-scattering albedo are simulated using an aerosol transport model coupled with an atmospheric general circulation model. All the main tropospheric aerosols are treated, that is, carbonaceous (organic and black carbons), sulfate, soil dust, and sea salt aerosols. The simulated total aerosol optical thickness, Ångström exponent, and single-scattering albedp for mixtures of four aerosol species are compared with observed values from both optical ground-based measurements and satellite remote sensing retrievals at dozens of locations including seasonal variations. The mean difference between the simulation and observations is found to be less than 30% for the optical thickness and less than 0.05 for the single-scattering albedo in most regions. The simulated single-scattering albedo over the Saharan region is, however, substantially smaller than the observation, though the standard optical constant of soil dust is used in this study. The radiative forcing by the direct effect of the main tropospheric aerosols is then estimated. The global annual mean values of the total direct radiative forcing of anthropogenic carbonaceous plus sulfate aerosols are calculated to be -0.19 and -0.75 W m-2 under whole-sky and clear-sky conditions at the tropopause, respectively.

元の言語英語
ページ(範囲)333-352
ページ数20
ジャーナルJournal of Climate
15
発行部数4
DOI
出版物ステータス出版済み - 2 15 2002
外部発表Yes

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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