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| GPM (satellite) | |
|---|---|
| Name | Global Precipitation Measurement |
| Names | GPM Core Observatory |
| Mission type | Earth observation |
| Operator | National Aeronautics and Space Administration / Japan Aerospace Exploration Agency |
| Cospar id | 2014-007A |
| Satcat | 39533 |
| Mission duration | Design life: 3 years (operational ongoing) |
| Manufacturer | Ball Aerospace / NASA Goddard Space Flight Center / Japan Aerospace Exploration Agency |
| Launch mass | 3850 kg |
| Power | Solar arrays |
| Launch date | 2014-02-27 |
| Launch site | Tanegashima Space Center |
| Launch vehicle | H-IIA |
| Orbit type | Low Earth orbit, inclined |
| Apsis | gee |
GPM (satellite)
The Global Precipitation Measurement Core Observatory is a joint mission between National Aeronautics and Space Administration and Japan Aerospace Exploration Agency to measure global precipitation from space. Designed as a reference standard for an international constellation, the observatory combines active and passive sensors to observe rain and snow across latitudes. It supports operational forecasting, climate research, and hydrologic applications by providing calibrated, high-resolution precipitation estimates.
The Core Observatory serves as the calibration hub for the Global Precipitation Measurement mission, linking datasets from a distributed constellation of satellites operated by partners such as European Space Agency, Indian Space Research Organisation, China National Space Administration, and Meteorological Service of Canada. The platform hosts instruments conceived through partnerships among NASA Goddard Space Flight Center, JAXA, Ball Aerospace, and university laboratories including Colorado State University, Massachusetts Institute of Technology, and University of Tokyo. Built to validate passive microwave retrievals with active radar observations, the observatory enables cross-calibration with heritage missions like Tropical Rainfall Measuring Mission and successor programs such as Copernicus Programme payloads.
Primary objectives include quantifying instantaneous precipitation, characterizing precipitation microphysics, and improving precipitation measurement algorithms used by agencies like National Oceanic and Atmospheric Administration, European Centre for Medium-Range Weather Forecasts, and Met Office. The mission aims to resolve precipitation structure at scales relevant to Weather Research and Forecasting Model studies and to support flood, drought, and water resource applications for organizations including United Nations agencies and regional hydrologic services. Long-term goals encompass advancing understanding of the global water cycle, informing Intergovernmental Panel on Climate Change assessments, and improving quantitative precipitation estimation for disaster management coordinated by World Meteorological Organization.
The observatory carries two primary instruments: the Dual-frequency Precipitation Radar (DPR) developed by Japan Aerospace Exploration Agency and the GPM Microwave Imager (GMI) developed by NASA Goddard Space Flight Center. The DPR operates at Ku and Ka bands to provide three-dimensional precipitation structure, while the GMI is a conical-scanning passive microwave radiometer with multiple channels spanning microwave frequencies for columnar brightness temperatures. Ancillary subsystems include attitude control from Ball Aerospace components, thermal control systems influenced by design practices at Jet Propulsion Laboratory, and data handling electronics developed with input from NASA Marshall Space Flight Center teams. Instrument calibration leverages radiometric standards from institutions like National Institute of Standards and Technology and algorithm development involves researchers at University Corporation for Atmospheric Research and National Center for Atmospheric Research.
The observatory launched aboard an H-IIA launch vehicle from Tanegashima Space Center on 27 February 2014 into a 65-degree inclined low Earth orbit. The orbit was selected to maximize overlap with existing satellites in the GPM constellation and to provide frequent revisit times for mid-latitude and tropical precipitation sampling. Ground operations are coordinated between NASA Goddard Space Flight Center mission control and JAXA launch and tracking facilities. The spacecraft’s orbital parameters facilitate inter-comparison with polar-orbiting platforms from National Oceanic and Atmospheric Administration and geostationary imagers such as those on Himawari and GOES series meteorological satellites.
Operational processing produces calibrated radar profiles, multi-frequency passive microwave brightness temperatures, and combined precipitation retrievals distributed by the GPM Precipitation Processing System at NASA Goddard. Data products include Level 1 brightness temperatures, Level 2 swath precipitation retrievals, and Level 3 gridded, time-aggregated precipitation estimates compatible with archives maintained by National Snow and Ice Data Center and PANGEA (data repository). Near-real-time products support agencies like European Centre for Medium-Range Weather Forecasts and Japan Meteorological Agency for assimilation into numerical models. Validation campaigns have involved field programs such as Global Energy and Water Exchanges and the Tropical Composition, Cloud and Climate Coupling experiments.
GPM has improved estimates of global precipitation climatology, reduced uncertainties in latent heat release used by climate models evaluated by Intergovernmental Panel on Climate Change, and enhanced flood forecasting in river basins monitored by institutions like World Bank operational projects. Research leveraging GPM data has refined microphysical parameterizations in models developed at Princeton University and Massachusetts Institute of Technology, improved retrieval algorithms compared against ground radars operated by National Weather Service, and provided insights into extreme precipitation events tied to El Niño–Southern Oscillation variability and Indian Ocean Dipole phases. Studies have quantified snowfall retrieval capabilities, informing cryosphere assessments by National Snow and Ice Data Center and regional climate analyses in collaboration with European Space Agency science teams.
The GPM program originated from cooperative discussions among NASA, JAXA, and international partners to succeed and expand upon Tropical Rainfall Measuring Mission achievements. The program’s constellation concept relies on contributions from agencies including NOAA, ESA, ISRO, CNSA, and national meteorological services to provide multi-sensor coverage. Historic milestones include launch of the Core Observatory in 2014, subsequent integration of partner satellites into the constellation, and continuing data stewardship through international data centers and science teams coordinated under entities like World Meteorological Organization and Committee on Earth Observation Satellites. The program exemplifies multinational cooperation in Earth observation and continues to influence remote sensing strategies across agencies such as European Organisation for the Exploitation of Meteorological Satellites and regional space programs.
Category:Earth observation satellites Category:NASA satellites Category:JAXA spacecraft