Statistics – Computation
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....9112g&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #9112
Statistics
Computation
Scientific paper
If the optical properties throughout a planetary atmosphere and the boundary conditions -- ie solar insolation at the top and surface albedo at the bottom -- are known, the radiance inside the atmosphere can be modeled by radiative transfer computations. When analyzing radiance measurements from a descent probe, we have to solve the inverse problem to retrieve optical properties. Venera descent probe spectrophotometer measurements of zenith and nadir radiance intensities had been used to estimate the volume extinction coefficient and the single scattering albedo from 60 km altitude down to the surface. But in order to do that, an assumption about the asymmetry parameter g of the scattering phase funtions had to be made. The resultant extinctions and albedos were uncertain within a factor 1-g. As g may be not much smaller than unity, the uncertainty of 1-g could become large. For the analysis presented here, additionally to the zenith and nadir intensity measurements by Venera 14, data from the wide angle spectral channel have been used, which provide mean intensities over the upper hemisphere. This supplementary information about the angular distribution of observed radiance allows to constrain also the phase function asymmetry parameter g, thus enabling the simultaneous retrieval of extinction, single scattering albedo, and phase function in dependence on altitude. The retrieved optical properties and the corresponding radiance field troughout Venus' atmosphere are presented.
Grieger Bjoern
Ignatiev Nikolai
Titov Dimitry
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