Scattering Properties of Cirrus Clouds in the Shortwave Spectral Region

Cirrus are commonly distributed between the top of troposphere and the below of stratosphere. They are mainly composed of non-spherical ice crystals with various shapes. Scattering properties of ice crystals are important to climatic model, radiative transfer, remote sensing and so on. The database of single-scattering properties for each of ice crystal particles was computed by Yang et al.In the database, six non-spherical ice crystal habits(hexagonal solid, hexagonal hollow column, hexagonal plate, aggregate, bullet rosette, dendrite)were considered. The mean single-scattering properties of cirrus in shorthwave region(0.2～5μm)were obtained based on the database assumingΓdistribution of ice crystal in the cirrus.These mean single-scattering properties include the extinction efficiency, absorption efficiency, phase function and so on. The spectral variations of the mean single-scattering properties were shown, as well as their dependence on the particle shapes and effective size, and the cause were discussed.