文档介绍：Solar aspects of papers
Statistical approach for the aerosol retrieval from limb scattered solar radiation
. Timofeyev (1), . Polyakov (1), . Vasilyev (1), . Virolainen (1), . Steele (2), and . Newchurch (3)
(1) Research Institute of Physics, St. Petersburg State University, Russia
(2) Dept. of Geography, California State University, Northridge, CA, USA
(3) Atm. Science Dept., University of Alabama in Huntsville, National Space Science and Technology Center, Huntsville, USA
SOSST Meeting, 15-17 June 2004, Boulder, Colorado
1. Introduction
Measured spectra of limb scattered solar radiance in UV, visible and near-IR spectral ranges depend on many of optical and physical parameters of the atmosphere:
,
where – the tangent height, – the wavelength, – the mixing ratio of i-the absorbing gas, – the extinction coefficient and the phase function of the molecular scattering determined by vertical profiles of atmospheric density, – extinction and scattering coefficients, the scattering phase function of ponent (including clouds), – optical characteristics of a surface.
Previously in interpreting the limb scattered solar spectra, the principal attention is given to determining the atmospheric gaseous content, first of all, the ozone content [Cunnold et al., 1973; Rusch et al., 1984; Llewellyn et al., 1997; Bovensmann et al., 1999; McPeters and Janz, 2000; Flittner and Bhartia, 2000].
In our paper, the statistical approach for the retrieval of aerosol optical characteristics from limb solar scattered measurements is proposed.
Geometry of satellite experiment
2. Radiative model (code) for spherical atmosphere
In the first stage, the radiative model for spherical atmosphere in the approximation of the single scattering has been developed. The Henyey-Greenstein approximation with the mean cosine as the single parameter was used for the aerosol phase function.
The developed code makes it possible to calculate variational derivatives of