The GSMaP Precipitation Retrieval Algorithm for Microwave Sounders-Part I: Over-Ocean Algorithm

We develop an over-ocean rainfall retrieval algorithm for the Advanced Microwave Sounding Unit (AMSU) based on the Global Satellite Mapping of Precipitation (GSMaP) microwave radiometer algorithm. This algorithm combines an emission-based estimate from brightness temperature (Tb) at 23 GHz and a sca...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2009-09, Vol.47 (9), p.3084-3097
Main Authors: Shige, S., Yamamoto, T., Tsukiyama, T., Kida, S., Ashiwake, H., Kubota, T., Seto, S., Aonashi, K., Okamoto, K.
Format: Article
Language:English
Subjects:
Acoustic scattering
Aerospace engineering
Algorithms
Applied geophysics
Earth
Earth sciences
Earth, ocean, space
Estimates
Exact sciences and technology
Extraterrestrial measurements
Internal geophysics
Marine
Meteorology
Microwave radiometer (MWR)
Microwave radiometry
Microwave sensors
microwave sounder
NOAA
Precipitation
Rain
rain-rate retrieval
Rainfall
Retrieval
Satellite broadcasting
Sea measurements
Winter
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Summary:We develop an over-ocean rainfall retrieval algorithm for the Advanced Microwave Sounding Unit (AMSU) based on the Global Satellite Mapping of Precipitation (GSMaP) microwave radiometer algorithm. This algorithm combines an emission-based estimate from brightness temperature (Tb) at 23 GHz and a scattering-based estimate from Tb at 89 GHz, depending on a scattering index (SI) computed from Tb at both 89 and 150 GHz. Precipitation inhomogeneities are also taken into account. The GSMaP-retrieved rainfall from the AMSU (GSMaP_AMSU) is compared with the National Oceanic and Atmospheric Administration (NOAA) standard algorithm (NOAA_AMSU)-retrieved data using Tropical Rainfall Measuring Mission (TRMM) data as a reference. Rain rates retrieved by GSMaP_AMSU have better agreement with TRMM estimates over midlatitudes during winter. Better estimates over multitudes over winter are given by the use of Tb at 23 GHz in the GSMaP_AMSU algorithm. It was also shown that GSMaP_AMSU has higher rain detection than NOAA_AMSU.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2009.2019954