The Global Precipitation Measurement (GPM), a follow-on mission of TRMM, is currently being studied. The fundamental concept of this mission is to measure global precipitation (rainfall and snowfall) accurately and frequently by using a primary satellite and a constellation of multiple satellites that carry microwave radiometers. The GPM primary satellite is expected to carry a dual-frequency precipitation radar and a microwave radiometer. The coverage of the primary satellite will expand to the regions between 68 degrees north and south latitudes. The dual-frequency radar will provide detailed three dimensional storm structure information. The constellation satellites, which will be launched by cooperating space agencies, will realize frequent measurements of precipitation. The measured data are to be transferred to and processed at the GPM ground data processing systems in order to deliver a global precipitation map every three hours. The GPM primary satellite is planned to be launched in 2007 in Japan-US partnership.
<<The Results Expected from GPM >>
Contribution to research and monitoring of global warming and climate change by observing the changes of the amount and areas of precipitation that follow the climate change.
Substantial improvement in numerical weather prediction by the real-time and frequent distribution of data measured by the constellation of satellites.
Efficient and effective management of water resources, such as flood control measures, river water management and storage control of dams, which results from the improvement of weather and flood forecasts and the application of three-hourly precipitation maps.
Contribution to agricultural management by improving crop estimation.
Contribution to safe operation of ships and airplanes by improving forecasts of typhoons and hurricanes.