Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.2949v&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 19, p. 2949-2952
Physics
5
Atmospheric Composition And Structure: Cloud Physics And Chemistry
Scientific paper
A ground-based photometer was used to monitor the temporal variation of the zenith-scattered skylight radiance (at λ=752nm) with a temporal resolution of 2 Hz. In detail, eight data sets for different optically thick (τc>=1/(1-g) with τc being the cloud's optical thickness and g the asymmetry factor for Mie scattering) cloud covers were analyzed with standard spectra methods. A general feature of all cloudy sky radiance power spectra is the presence of a remarkable scale break occurring at spatial scales that approximately correspond to the vertical cloud extension. This finding is consistent with theoretical estimates by Marshak et al. [1995] and Davis et al. [1997b] based on radiative smoothing by photon diffusion in vertically extended, optically thick and homogeneous clouds.
Funk O.
Pfeilsticker Klaus
Platt Ulrich
von Savigny Christian
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