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| Titel |
Influence of crystal shapes on radiative fluxes in visible wavelength: ice crystals randomly oriented in space |
| VerfasserIn |
P. Chervet, H. Isaka, T. Nakajima |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 8 ; Nr. 14, no. 8, S.837-844 |
| Datensatznummer |
250012387
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| Publikation (Nr.) |
 copernicus.org/angeo-14-837-1996.pdf |
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| Zusammenfassung |
| 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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