Global Precipitation Climatology Project

Project Description
The Global Precipitation Climatology Project(GPCP) is an element of
the Global Energy and Water Cycle Experiment (GEWEX) of the World
Climate Research program (WCRP). It was established by the WCRP in
1986 with the initial goal of providing monthly mean precipitation
data on a 2.5 x 2.5 degree latitude -longitude grid for the period
1986-1995. This was recently extended to the year 2000. The GPCP will
accomplish this by merging infrared and microwave satellite estimates
of precipitation with rain gauge data from more than 30,000
stations. Infrared precipitation estimates are obtained from GOES
(United States), GMS (Japan) and Meteosat (European Community)
geostationary satellites and National Oceanic and Atmospheric
Administration (NOAA) operational polar orbiting satellites. Microwave
estimates are obtained from the U.S. Defense Meteorological Satellite
Program (DMSP) satellites using the Special Sensor Microwave Imager
(SSM/I). These data sets will be used to validate general circulation
and climate models, study the global hydrological cycle and diagnose
the variability of the global climate system. Data are available
beginning in January 1986. Merged satellite and gauge data are
available starting with July 1987.

The GPCP is developing new products. One product that is under
development is a one degree global daily product. Another set of
products under development include SSM/I derived rain variability
parameters (rainfall, variance, aerial coverage, etc).


Arnold Gruber
Office of Research and Applications
Washington D.C. 20233
Ph: 301-763-8127
Fax: 301-763-8108

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