Stellar Occultation Remote Sensing of Atmosphere from Space: Gaseous Content and Characteristics of Refractive Index Inhomogeneities

Details Stellar Occultation Remote Sensing of Atmosphere from Space: Gaseous Content and Characteristics of Refractive Index Inhomogeneities Stellar Occultation Remote Sensing of Atmosphere from Space: Gaseous Content and Characteristics of Refractive Index Inhomogeneities

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusm.a22b..04g&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #A22B-04

Physics

0300 Atmospheric Composition And Structure, 0394 Instruments And Techniques, 0399 General Or Miscellaneous

Scientific paper

The use of a star as the radiance source in Earth limb occultation measurements allows one to increase the number of satellite measurements (in comparison with Sun occultation experiments) and to perform nighttime observations (MSX/UVISI and Envisat/GOMOS). In addition, stellar occultation experiments permit the study of inhomogeneities in the atmospheric refractive index caused by the Kolmogorov turbulence and anisotropic component of the inhomogeneity spectrum. In this paper, the impact of star scintillations on the accuracy of retrieving the characteristics of atmospheric gaseous and aerosol content and on possibly retrieving the characteristics of refractive index inhomogeneity of different types has been studied. Errors in retrieving the ozone profiles from satellite-based stellar occultation measurements of different scenarios and with different types of star scintillations (which are considered as additional ``measurement noise'') have been numerically estimated. A priori information on statistical scintillation characteristics is demonstrated to be of great importance for qualitatively solving the inverse problem of retrieving the characteristics of atmospheric gaseous content. The inverse problem of retrieving the characteristics of refractive index inhomogeneities based on the analysis of one-dimensional scintillation spectra has been formulated, and peculiarities of such problems are discussed. Results of numerical experiments to retrieve the characteristics of refractive index inhomogeneities from satellite measurements under different conditions are given. Modeling studies show that observations of stars located at different angular distances from orbit plane could give adequate information for retrieving 3-D spectra of atmospheric inhomogeneities of air density. Some examples of interpreting the data from a high-frequency photometer, which operated aboard Space Station Mir, are given. Possibilities of retrieving the characteristics of refractive index inhomogeneities from hyperspectral stellar occultation measurements (of the UVISI type) are analyzed.

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