Radiative heating rates and direct radiative forcing by mineral dust in cloudy atmospheric conditions

摘要: We explore several issues relevant to assessments of solar and infrared radiative effects due mineral aerosols. One issue is the importance vertical distribution dust for calculations heating rates. Another role that clouds may play in augmenting forcing by dust. also composition aerosols employing spectral optical properties comes from two different regions globe, Saharan Afghan deserts. A combined longwave shortwave transfer model was used determine instantaneous atmosphere, fluxes at surface, rates airborne clear-sky cloudy atmospheric conditions. Extensive with our show increasing loading results both cooling However, net during day are always positive, yielding layer. With similar conditions loading, causes larger than The magnitudes can easily be 25% high Sun angles over bright surfaces. Also, yields more positive values TOA (top atmosphere) dust; a diurnal average, this lead change sign negative just mineralogical composition. Clouds significantly influence direct impact depending on cloud altitude depth. Moreover, strongly dependent position surface albedo.