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- W46509103 abstract "Tropospheric aerosols, from natural and anthropogenic sources, may have a significant influence on the radiative balance of the Earth by their direct and indirect effects. The a im of this paper is to study the interactions between aerosol particles (SO4 2- ) and the cloud radiative properties. Consequently, using the production p arameters and bu rdens of SO4 2- predicted b y eleven chemical t ransport models, we have calculated the microphysical parameters: liquid water content, cloud d roplet number concentration, effective radius, cloud albedo, and the susceptibility (the sensitivity of cloud albedo to changes in cloud droplet number concentration(CDNC)). The relationships proposed by Boucher and Lohmann (1995) and by Menon and Saxena (1998) were used to compare the values of CDNC for maritime and continental clouds. The obtained values of the cloud p arameters with these relationships are in agreement with the results from satellitare data for small amounts of sulfate mass concentration. Consequently, new approximations or corrections are necessary for the relationships between aerosol sulfate mass and cloud droplet number concentrations, for higher values of sulfate amount. Aerosols have a direct radiative forcing because they scatter and absorb solar and infrared radiation in the atmosphere. Aerosols also alter the formation and precipitation efficiency of liquid-water, ice and mixed-phase clouds, thereby causing an indirect radiative forcing associated with the changes in cloud properties. The quantification o f aerosol radiative forcing is more complex than the quantification o f greenhouse gases radiative forcing because aerosol mass and particle number concentrations are highly v ariable in space and time. The indirect effects (Twomey, 1977, Albrecht, 1989, and Pincus and Baker, 1994) are far more complex and more difficult to assess than the direct effect, because they depend on a chain o f phenomena that connect chemical and physical properties of aerosol to concentration o f cloud condensation n uclei (CCN), then CCN concentrations to cloud droplet number concentrations (CDNC) and these, in turn, the cloud albedo. Therefore, it is a great challenge in adequately characterising the nature and occurrence of atmospheric aerosols and in including their effects in models to reduce uncertainties in climate prediction. Large uncertainties appears because aerosols: originate from a variety o f sources, are distributed across a wide spectrum of" @default.
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- W46509103 date "2003-01-01" @default.
- W46509103 modified "2023-10-18" @default.
- W46509103 title "INFLUENCE OF SULFATE AEROSOL PARTICLES ON RADIATIVE PROPERTIES OF CLOUDS" @default.
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