GPM-Derived Climatology of Attenuation Due to Clouds and Precipitation at Ka-Band

Type Article
Date 2020-03
Language English
Author(s) Battaglia Alessandro1, Mroz Kamil2, Watters Daniel3, Ardhuin FabriceORCID4
Affiliation(s) 1 : Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, U.K., and also with the National Centre for Earth Observation, Leicester LE1 7RH, U.K
2 : National Centre for Earth Observation, Leicester LE1 7RH, U.K.
3 : Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, U.K.
4 : Ifremer Centre de Bretagne, Laboratoire d'Océanographie Physique et Spatiale, 29280 Plouzané, France.
Source Ieee Transactions On Geoscience And Remote Sensing (0196-2892) (Institute of Electrical and Electronics Engineers (IEEE)), 2020-03 , Vol. 58 , N. 3 , P. 1812-1820
DOI 10.1109/TGRS.2019.2949052
WOS© Times Cited 8
Keyword(s) Attenuation, cloud and precipitation, Ka-band, radar

Attenuation from clouds and precipitation hinders the use of Ka-band in SARs, radar altimeters and in satellite link communications. The NASA-JAXA Global Precipitation Measurement (GPM) mission, with its core satellite payload including a dual-frequency (13.6 and 35.5 GHz) radar and a multifrequency passive microwave radiometer, offers an unprecedented opportunity for better quantifying such attenuation effects. Based on four years of GPM products, this article presents a global climatology of Ka-band attenuation caused by clouds and precipitation and analyses the impact of the precipitation diurnal cycle. As expected, regions of high attenuation mirror precipitation patterns. Clouds and precipitation cause two-way attenuation at 35.5 GHz in excess of 3 dB about 1.5% of the time in the regions below 65$°, peaking at as much as 10% in the tropical rain belt and the South Pacific Convergence Zone and at circa 5% along the storm tracks of the North Atlantic and Pacific Oceans. Confirming previous findings, the diurnal cycle is particularly strong over the land and during the summer period; while over the ocean, the diurnal cycle is generally weaker some coherent features emerge in the tropical oceans and in the northern hemisphere. Results are useful for estimating data loss from (sun-synchronous) satellite adopting active instruments/links at a frequency close to 35 GHz.

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