Global Precipitation Measurement
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| Global Precipitation Measurement | |
|---|---|
| Name | Global Precipitation Measurement |
| Mission | Satellite precipitation measurement constellation |
| Operator | National Aeronautics and Space Administration, Japan Aerospace Exploration Agency |
| Launch | 2014 (Core Observatory) |
| Spacecraft type | Earth observation |
| Orbit | Low Earth orbit |
| Instruments | Dual-frequency radar, multi-channel microwave radiometer, precipitation radar |
Global Precipitation Measurement
The Global Precipitation Measurement initiative is an international satellite mission led by National Aeronautics and Space Administration and Japan Aerospace Exploration Agency that provides near-global observations of rain and snow using a constellation of satellites. The program supports research and operational applications across climatology, hydrology, and meteorology by delivering calibrated precipitation estimates and time-resolved products for assimilation into numerical weather prediction systems and climate analyses.
Overview
The program began with a Core Observatory launched in 2014 and expanded through a constellation architecture involving partner missions from agencies such as European Space Agency, Indian Space Research Organisation, China National Space Administration, Canadian Space Agency, and Japan Aerospace Exploration Agency. The project integrates observations from the Core Observatory with data from partner satellites and ground networks including Doppler radar, radiosonde, and rain gauge networks to produce gridded precipitation products. The initiative interfaces with international frameworks like the World Meteorological Organization protocols, contributes to programs including the Global Earth Observation System of Systems, and supports applications in efforts such as Sendai Framework for Disaster Risk Reduction and Intergovernmental Panel on Climate Change assessments.
Mission and Instruments
The Core Observatory carries a dual-frequency Ka-Ku band precipitation radar and a 13-channel microwave radiometer derived from heritage instruments flown on missions such as Tropical Rainfall Measuring Mission and research satellites from NOAA and EUMETSAT. The precipitation radar provides three-dimensional profiling similar to airborne radars used by programs like NASA ER-2 campaigns and complements microwave imagers aboard polar-orbiting platforms such as MetOp and Suomi NPP. Instrument calibration strategies reference standards from terrestrial facilities including National Institute of Standards and Technology and leverage cross-comparisons with spaceborne sensors from missions like GPM Core Observatory partner satellites and successor platforms flown by JAXA and ISRO.
Data Products and Processing
Level-1 and Level-2 radiometric and radar retrievals feed Level-3 gridded products and Level-4 merged datasets tailored for assimilation into systems used by European Centre for Medium-Range Weather Forecasts, National Centers for Environmental Prediction, and regional agencies. The processing pipeline incorporates algorithms developed in collaboration with research groups at institutions such as Massachusetts Institute of Technology, California Institute of Technology, Jet Propulsion Laboratory, University of Maryland, and Colorado State University. Data formats follow conventions used by archives like NASA Goddard Space Flight Center and are integrated with portals operated by Global Change Data Center and operational nodes within World Meteorological Organization networks for delivery to users in sectors including agriculture ministries, emergency management agencies, and academic consortia such as International Research Institute for Climate and Society.
Scientific Applications
Products support studies of convective processes investigated by research teams at National Center for Atmospheric Research and experiments like DYNAMO and HEPEX, enable trend analyses relevant to IPCC reports and regional climate assessments conducted by organizations such as NOAA and European Commission research directorates, and inform flood forecasting systems managed by agencies like US Army Corps of Engineers and national hydrological services. The dataset underpins research on extreme precipitation linked to phenomena including El Niño–Southern Oscillation, Indian Ocean Dipole, and Atlantic Meridional Mode, and supports evaluations of coupled model simulations from initiatives such as the Coupled Model Intercomparison Project.
Validation and Calibration
Validation utilizes coordinated field campaigns and ground reference networks including GPM Ground Validation, operational weather radar networks like NEXRAD, and specialized campaigns supported by universities and agencies such as NOAA Hurricane Research Division and JAXA field projects. Cross-calibration employs standards and intercomparisons with microwave and radar sensors on platforms like MetOp, NOAA-20, and partner satellites from CNSA and ISRO, and relies on metrology guidance from institutions including National Institute of Standards and Technology to maintain traceability. Independent assessment efforts involve groups at University of Washington, Columbia University, Princeton University, and international consortia coordinated through World Meteorological Organization working groups.
International Collaboration and Operations
The constellation model depends on contributions from space agencies including NASA, JAXA, ESA, ISRO, CNSA, and CSA, and on operational data sharing agreements with organizations such as NOAA, EUMETSAT, and regional meteorological services. Ground system operations and data distribution are coordinated among centers like NASA Goddard Space Flight Center, JAXA Earth Observation Research Center, European Space Agency operations, and national data centers to support near-real-time dissemination for disaster response partners including United Nations Office for the Coordination of Humanitarian Affairs and regional warning centers. Ongoing international workshops and steering committees involve participants from research institutions such as Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory, and Potsdam Institute for Climate Impact Research to guide mission evolution, algorithm development, and user engagement.