Jason (satellite altimeter series)
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| Jason (satellite altimeter series) | |
|---|---|
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| Name | Jason series |
| Mission type | Oceanography, Altimetry |
| Operators | CNES / NASA / EUMETSAT / NOAA |
| Launch mass | Varies |
| Power | Varies |
| Launched | 1992–2016 (series) |
Jason (satellite altimeter series)
The Jason series of satellite altimeters are a succession of spaceborne radar altimetry missions designed to measure global sea surface height, ocean circulation, sea level rise, and climate variability. Developed through partnerships among Centre National d'Études Spatiales, National Aeronautics and Space Administration, European Space Agency, National Oceanic and Atmospheric Administration, and EUMETSAT, the program built on heritage from TOPEX/Poseidon and paved the way for later missions such as Jason-3 and Sentinel-6 Michael Freilich. The instruments provided continuous, precise observations used across Intergovernmental Panel on Climate Change, United Nations Framework Convention on Climate Change, World Meteorological Organization, and oceanographic research.
Overview
The Jason altimeter series continued the high-precision sea surface height record originated by TOPEX/Poseidon and extended it through a multi-decadal observing system relied upon by NASA, CNES, NOAA, EUMETSAT, European Commission, and academic institutions such as Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, Lamont–Doherty Earth Observatory, and Institut Français de Recherche pour l'Exploitation de la Mer. Measurements supported studies in climate change, El Niño–Southern Oscillation, Indian Ocean Dipole, Pacific Decadal Oscillation, and coastal hazards, informing policy dialogues at the United Nations and assessments by the Intergovernmental Panel on Climate Change.
Development and Mission History
The Jason program evolved from cooperative planning between NASA and CNES after the success of TOPEX/Poseidon. Formal agreements involved agencies including NOAA, EUMETSAT, and scientific consortia from United States, France, and Europe. The series encompassed missions commonly known as Jason-1, Jason-2 (also called OSTM), Jason-3, and the Jason Follow-On elements integrated into Sentinel-6. Key program milestones intersected with launches from sites such as Cape Canaveral Air Force Station, Vandenberg Air Force Base, and coordination with tracking networks including Deep Space Network and DORIS.
Spacecraft Design and Instruments
Each Jason-class spacecraft carried radar altimeters, microwave radiometers, precision orbit determination instruments, and onboard processors developed by contractors and laboratories across France, United States, and Europe. Principal payloads included a Poseidon-type radar altimeter derived from Poseidon (altimeter), a dual-frequency microwave radiometer for wet-troposphere corrections, and tracking instruments like DORIS transmitters, GPS receivers, and Star trackers. Spacecraft bus components were provided by industrial partners from France and the United States, with instrument teams at institutions such as Jet Propulsion Laboratory, CNES Toulouse, and Thales Alenia Space.
Launches and Mission Timeline
Jason-class launches occurred across decades, with sequencing coordinated to maintain an unbroken sea surface height record. Major launches included the transition following TOPEX/Poseidon operations, the Jason-1 launch, the Ocean Surface Topography Mission (Jason-2/OSTM) deployment, and subsequent Jason-3 commissioning. Launch vehicles and sites involved partners including United Launch Alliance, Arianespace, and Delta II heritage flight systems, while ground segments used facilities from NASA Goddard Space Flight Center, CNES control centers, and NOAA operations to manage telemetry, tracking, and data dissemination.
Data Products and Applications
The Jason altimeters produced calibrated products such as sea surface height anomalies, mean sea surface, geostrophic currents, significant wave height, and wind speed. Data processing centers at NASA Jet Propulsion Laboratory, CNES, Colorado Center for Astrodynamics Research, and international data centers generated multi-mission climate data records used by the Intergovernmental Oceanographic Commission, Global Climate Observing System, and researchers studying sea level rise, coastal inundation, ocean heat content, and marine ecosystem shifts. Operational services leveraged Jason data for marine navigation, offshore engineering, and climate monitoring by NOAA National Centers for Environmental Information and regional programs in Australia, Japan, and United Kingdom.
International Collaboration and Management
Management of the Jason series exemplified multinational cooperation among CNES, NASA, NOAA, EUMETSAT, and European Commission programs, with scientific governance from International Oceanographic Commission and data stewardship by repositories such as Physical Oceanography Distributed Active Archive Center and national oceanographic centers. Policy coordination involved agencies and institutions including European Space Agency, French Ministry of Higher Education and Research, U.S. Department of Commerce, UK Met Office, and research universities, integrating technical, scientific, and operational roles across continents.
Legacy and Successor Missions
The Jason program legacy includes a continuous altimetric record critical to global sea level budgets used by the Intergovernmental Panel on Climate Change and national agencies for adaptation planning. Successor and complementary missions include Jason-3, Sentinel-6 Michael Freilich, CryoSat, AltiKa, and future concepts in the Copernicus Programme and CEOS coordination. The program influenced instrument design, international partnership models, and climate policy inputs, cementing its role alongside landmark projects such as TOPEX/Poseidon and shaping oceanographic observation into the 21st century.