Influence of crystal shapes on radiative fluxes in visible wavelength: ice crystals randomly oriented in space

Details Influence of crystal shapes on radiative fluxes in visible wavelength: ice crystals randomly oriented in space Influence of crystal shapes on radiative fluxes in visible wavelength: ice crystals randomly oriented in space

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996angeo..14..837c&link_type=abstract

Annales Geophysicae, vol. 14, Issue 8, pp.837-844

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Radiative properties of cirrus clouds are one of the major unsolved problems in climate studies and global radiation budget. These clouds are generally composed of various ice-crystal shapes, so we tried to evaluate effects of the ice-crystal shape on radiative fluxes. We calculated radiative fluxes of cirrus clouds with a constant geometrical depth, composed of ice crystals with different shapes (hexagonal columns, bullets, bullet-rosettes), sizes and various concentrations. We considered ice particles randomly oriented in space (3D case) and their scattering phase functions were calculated by a ray-tracing method. We calculated radiative fluxes for cirrus layers for different microphysical characteristics by using a discrete-ordinate radiative code. Results showed that the foremost effect of the ice-crystal shape on radiative properties of cirrus clouds was that on the optical thickness, while the variation of the scattering phase function with the ice shape remained less than 3% for our computations. The ice-water content may be a better choice to parameterize the optical properties of cirrus, but the shape effect must be included.

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