Physics – Geophysics
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgrd..107.4261v&link_type=abstract
Journal of Geophysical Research (Atmospheres), Volume 107, Issue D15, pp. ACH 7-1, CiteID 4261, DOI 10.1029/2001JD000796
Physics
Geophysics
2
Atmospheric Composition And Structure: Pressure, Density, And Temperature, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Atmospheric Composition And Structure: Instruments And Techniques, Mathematical Geophysics: Inverse Theory
Scientific paper
In this paper, an inversion algorithm for the retrieval of total density, pressure, and temperature in the Earth's lower atmosphere from refraction angle measurements by a visible-light imager is presented. A detailed description of the retrieval algorithm is provided, and its performance under a variety of conditions is assessed, including a rigorous evaluation of the statistical and systematic uncertainties. Tests show that visible-light images of stellar refraction can provide reasonably accurate measurements of the atmospheric bulk properties from the surface (or cloud top heights) to roughly 30 km altitude. The combined statistical and systematic uncertainties in density and temperature profiles retrieved with a vertical resolution of 1 km decrease from 3.1% and 5 K, respectively, at 30 km to 0.8% and 3.8 K at 20 km and 0.35% and 1.5 K at 10 km for an imager with a sampling rate of 10 Hz and pointing control/knowledge of 0.002° (1σ). This level of accuracy and resolution is adequate for a combined extinctive/refractive occultation technique for remotely sensing the Earth's lower atmosphere that has recently been demonstrated using data taken by the Ultraviolet and Visible Imagers and Spectrographic Imagers (UVISI) on the Midcourse Space Experiment (MSX) spacecraft.
Carbary James F.
Morgan Frank
Vervack Ronald J. Jr.
Yee Jeng-Hwa
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