Potential Physical Processes Explaining the Observed Spectral Signature of Cloudy Column Solar Radiation Absorption

Details Potential Physical Processes Explaining the Observed Spectral Signature of Cloudy Column Solar Radiation Absorption Potential Physical Processes Explaining the Observed Spectral Signature of Cloudy Column Solar Radiation Absorption

Jun 1960

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960stin...0276170g&link_type=abstract

Technical Report, DE2001-761458; LBNL--43439

Physics

Absorption Spectroscopy, Cloud Physics, Solar Radiation, Aerosols, Spectral Signatures, Refractivity, Radiative Transfer, Broadband, In Situ Measurement

Scientific paper

The results presented here have shown that the spectral signature of sabsorption in a cloudy layer could be duplicated (except for the 1.06 s(micro)m region) with a rather sophisticated radiative transfer model, sif the absorption by both aerosol and cloud droplets was enhanced. In sthe case of aerosol, highly absorbing (imaginary part of refractive sindex between 0.1 and 0.01), small (2 - 5 nm) particles dramatically simproved the match between observations and model computations. sDuplication of the observed cloud absorption required a thin layer of sdrizzle (large droplets). The only feature remaining unexplained at this stime is the enhanced absorption at 1.06 (micro)m. These results are only sbased on one day of observations and need to be verified. This study ssuggests the need for additional co-located broadband and spectral sobservations in clear and cloudy sky conditions in different atmospheric sregimes. In-situ aerosol and cloud droplet microphysical measurements swill be crucial to unravel the role of these particles in the 'enhanced sabsorption' issue. Finally, accurate absorption measurements are needed sat 1.06 (micro)m to understand observed absorption in that spectral sregion.

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