On the wavelength-dependent attenuation of UV radiation by clouds

Details On the wavelength-dependent attenuation of UV radiation by clouds On the wavelength-dependent attenuation of UV radiation by clouds

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3505806l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 5, CiteID L05806

Physics

10

Atmospheric Composition And Structure: Cloud/Radiation Interaction, Global Change: Atmosphere (0315, 0325), Atmospheric Processes: Radiative Processes, Atmospheric Processes: Clouds And Aerosols

Scientific paper

We studied the wavelength-dependence of the attenuation of incoming solar UV radiation by a homogeneous cloud layer. By systematic analysis of irradiances simulated with a radiative transfer model, we were able to separate the wavelength-dependence of the cloud modification factor into different components, and thus achieve an understanding of the physical processes involved. Our results show that short wavelengths, in general, penetrate the cloud more effectively than longer wavelengths and that there are two important contributors to this wavelength-dependence: (1) that induced by multiple scattering between the cloud top and the atmosphere above and (2) that introduced by the wavelength-dependent radiance distribution at the cloud top (including the direct beam) together with the transmittance of the cloud alone as function of angle of incidence. Furthermore, we found that the former does not depend on solar zenith angle, whereas the latter does and hence also introduces a solar zenith angle dependence in the wavelength-dependence of the cloud modification factor.

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