GCOM-W
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| GCOM-W | |
|---|---|
| Name | GCOM-W |
| Operator | Japan Aerospace Exploration Agency |
| Mission type | Earth observation |
| Manufacturer | Mitsubishi Electric, Mitsubishi Heavy Industries |
| Launch date | 2012-05-18 |
| Launch vehicle | H-IIA |
| Launch site | Tanegashima Space Center |
| Orbit | Sun-synchronous |
| Instruments | Advanced Microwave Scanning Radiometer 2 |
GCOM-W GCOM-W is a Japanese Earth observation satellite developed by the Japan Aerospace Exploration Agency and industry partners to monitor global water cycle variables, cryosphere changes, and climate-related parameters. It provides calibrated microwave radiometry data to support operational services, scientific research, and international programs addressing climate change, hydrology, and cryosphere studies. The mission complements other spaceborne sensors from agencies such as NASA, European Space Agency, NOAA, and Indian Space Research Organisation.
Overview
The mission was conceived under national plans led by Ministry of Education, Culture, Sports, Science and Technology (Japan) with contributions from Japan Meteorological Agency and academic institutions like University of Tokyo and Tohoku University. GCOM-W carries the Advanced Microwave Scanning Radiometer 2 developed by a consortium including National Institute of Information and Communications Technology and industrial partners such as NEC Corporation. The program follows precedents set by satellite programs including ADEOS-II, Midori-II, Aqua (satellite), and SMAP (satellite) for systematic global microwave observations.
Mission and Objectives
Primary objectives include retrievals of sea surface temperature, soil moisture, precipitation, snow water equivalent, and sea-ice characteristics to support agencies such as Japan Meteorological Agency and United Nations Framework Convention on Climate Change. Secondary objectives emphasize calibration and validation campaigns with institutions like JAXA, METI (Japan), NASA Goddard Space Flight Center, and research centers including National Aeronautics and Space Administration collaborators and European Organisation for the Exploitation of Meteorological Satellites. The mission supports international initiatives including the Global Climate Observing System and the Group on Earth Observations through sustained data delivery.
Spacecraft and Instruments
The platform is based on a bus heritage from H-IIA-launched missions with attitude control systems developed by Mitsubishi Heavy Industries and thermal control designs influenced by prior missions such as ADEOS. The primary payload, the Advanced Microwave Scanning Radiometer 2, is a conically scanning microwave radiometer operating at multiple frequency bands optimized for atmospheric and surface retrievals similar in concept to instruments on Aqua (satellite) and GPM (satellite). Onboard subsystems include power systems by Toshiba Corporation-derived contractors, propulsion components from IHI Corporation, and data handling designed for compatibility with ground segments at Tsukuba Space Center. Calibration devices and antenna systems were validated using facilities at Japan Agency for Marine-Earth Science and Technology and academic laboratories including Kyoto University.
Launch and Operations
The satellite was launched aboard an H-IIA rocket from Tanegashima Space Center into a Sun-synchronous morning orbit to maximize radiometric stability and diurnal sampling. Mission operations were coordinated by JAXA flight control teams with operational links to Japan Meteorological Agency for near-real-time dissemination. Routine commissioning involved calibration/validation campaigns coordinated with field programs from institutions such as University of Tokyo, University of Alaska Fairbanks, Norwegian Polar Institute, and Chinese Academy of Sciences to compare in situ and airborne measurements. Operational anomalies and contingency responses leveraged heritage procedures from missions like Aqua (satellite) and Terra (satellite).
Data Products and Applications
GCOM-W generates Level 1 calibrated radiances and Level 2 retrieved geophysical products including soil moisture, precipitation rates, snow water equivalent, sea surface temperature, and sea-ice concentration. These products are used by Japan Meteorological Agency for weather and climate monitoring, by Food and Agriculture Organization-related programs for drought assessment, and by International Maritime Organization stakeholders for sea-ice routing. Scientific applications span climate model validation at centers such as IPCC assessment groups, assimilation into numerical weather prediction systems at Met Office and ECMWF, and support for hydrological forecasting used by agencies including Ministry of Land, Infrastructure, Transport and Tourism (Japan). Data also feed into multi-sensor projects alongside datasets from SMOS, SMAP (satellite), GPM (satellite), and CryoSat for synergistic retrievals.
International Collaboration and Management
The mission was managed through cooperative frameworks involving JAXA, national ministries, and international partners for calibration, validation, and data sharing. Formal collaborations included data exchange agreements with NASA, European Space Agency, NOAA, and scientific partnerships with universities such as Massachusetts Institute of Technology, Caltech, University of Cambridge, and University of Wisconsin–Madison. GCOM-W contributed to global observing strategies endorsed by Group on Earth Observations and participated in intercalibration events with platforms like Aqua (satellite) and Terra (satellite). Data stewardship and long-term archiving were coordinated with national archives at JAXA and international repositories such as National Centers for Environmental Information.