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      Variability of Absorption and Optical Properties of Key Aerosol Types Observed in Worldwide Locations

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          AERONET—A Federated Instrument Network and Data Archive for Aerosol Characterization

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            Climate forcing by anthropogenic aerosols.

            Although long considered to be of marginal importance to global climate change, tropospheric aerosol contributes substantially to radiative forcing, and anthropogenic sulfate aerosol in particular has imposed a major perturbation to this forcing. Both the direct scattering of shortwavelength solar radiation and the modification of the shortwave reflective properties of clouds by sulfate aerosol particles increase planetary albedo, thereby exerting a cooling influence on the planet. Current climate forcing due to anthropogenic sulfate is estimated to be -1 to -2 watts per square meter, globally averaged. This perturbation is comparable in magnitude to current anthropogenic greenhouse gas forcing but opposite in sign. Thus, the aerosol forcing has likely offset global greenhouse warming to a substantial degree. However, differences in geographical and seasonal distributions of these forcings preclude any simple compensation. Aerosol effects must be taken into account in evaluating anthropogenic influences on past, current, and projected future climate and in formulating policy regarding controls on emission of greenhouse gases and sulfur dioxide. Resolution of such policy issues requires integrated research on the magnitude and geographical distribution of aerosol climate forcing and on the controlling chemical and physical processes.
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              Optical Properties of Aerosols and Clouds: The Software Package OPAC

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                Author and article information

                Journal
                Journal of the Atmospheric Sciences
                J. Atmos. Sci.
                American Meteorological Society
                0022-4928
                1520-0469
                February 2002
                February 2002
                : 59
                : 3
                : 590-608
                Article
                10.1175/1520-0469(2002)059<0590:VOAAOP>2.0.CO;2
                7cf59486-f841-4c0e-a7b0-25ee69192735
                © 2002
                History

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