Speed Dependence of 22- and 118-GHz Line Shapes for Tropospheric Remote Sensing

Line shapes are influenced by the dependence of collision cross sections on molecular speeds, with resulting effect on the absorption of up to a few percents. Speed-dependence effects on the water line at 22.23 GHz and the oxygen line at 118.75 GHz are calculated for atmospheric conditions common in...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2019-12, Vol.57 (12), p.9702-9708
Main Authors: Rosenkranz, Philip W., Cimini, Domenico
Format: Article
Language:English
Subjects:
Absorption
Atmosphere
Atmospheric conditions
Atmospheric measurements
Dependence
Doppler effect
Microwave radiometers
Millimeter-wave propagation
Parameter uncertainty
passive microwave remote sensing
Profiles
Radiometers
Remote sensing
Resonant frequency
Shape
spectral shape
Water vapor
Water vapour
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Summary:Line shapes are influenced by the dependence of collision cross sections on molecular speeds, with resulting effect on the absorption of up to a few percents. Speed-dependence effects on the water line at 22.23 GHz and the oxygen line at 118.75 GHz are calculated for atmospheric conditions common in midlatitudes. The effect on water vapor profiles retrieved with a ground-based microwave radiometer shows an impact (in simulations) comparable in magnitude to those of measurement errors and of uncertainties in spectroscopic parameters.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2019.2928570