Jason-3

Jason-3
Name	Jason-3
Mission type	Earth observation
Operator	National Aeronautics and Space Administration / European Space Agency
COSPAR ID	2016-003A
SATCAT	41275
Manufacturer	Thales Alenia Space / Northrop Grumman
Launch date	2016-01-17
Launch site	Vandenberg Air Force Base
Launch vehicle	Falcon 9 Block 1
Orbit reference	Geocentric orbit
Orbit regime	Low Earth orbit
Instruments	Poseidon-3B altimeter, DORIS/LRA/GPS receivers

Jason-3 Jason-3 is a polar-orbiting ocean surface topography satellite designed to measure sea-level change, ocean circulation, and climate variability. It continued a series of satellite altimetry missions that built upon earlier platforms to provide precise global measurements of sea surface height, significant wave height, and surface wind speed. The mission supports climate science, Intergovernmental Panel on Climate Change assessments, and operational oceanography used by agencies such as NOAA, EUMETSAT, and CNES.

Overview

The mission is the successor in a continuity program following earlier altimetry missions including TOPEX/Poseidon, Jason-1, and Ocean Surface Topography Mission. It carries heritage instruments and improved systems to extend the multi-decadal sea level record critical for United Nations Framework Convention on Climate Change reporting and Intergovernmental Panel on Climate Change projections. The project was developed through partnerships between National Oceanic and Atmospheric Administration, Centre national d'études spatiales, European Organisation for the Exploitation of Meteorological Satellites, and European Space Agency entities, with industrial contributions from Thales Alenia Space and Northrop Grumman.

Mission Objectives

Primary objectives included continuing the precise global sea surface height time series to monitor global and regional sea level rise, mesoscale ocean circulation, and climate-related trends. Secondary objectives involved providing measurements for operational forecasting systems run by NOAA, assimilation into reanalysis projects like ECMWF and Copernicus Climate Change Service, and supporting studies related to El Niño–Southern Oscillation, Pacific Decadal Oscillation, and coastal inundation risk assessments used by World Meteorological Organization programs. The mission also aimed to refine geodetic tie-ins to International Terrestrial Reference Frame products and support altimeter calibration through crossovers with contemporaneous missions such as CryoSat-2 and Sentinel-3.

Spacecraft and Instruments

The spacecraft bus integrated a radar altimeter derived from the Poseidon family, specifically the Poseidon-3B instrument, designed to deliver centimeter-level sea surface height accuracy. Navigation and timing were supported by dual-frequency DORIS beacons, a Laser Retroreflector Array for Satellite Laser Ranging used by International Laser Ranging Service, and a GPS receiver for precise orbit determination contributing to International GNSS Service frameworks. Additional payload elements provided significant wave height and surface wind speed retrievals using radar pulse-shape analysis, benefitting research at institutions like Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, and Institut Pierre-Simon Laplace.

Launch and Orbit

The satellite was launched from Vandenberg Air Force Base aboard a Falcon 9 Block 1 vehicle, deploying into a near-circular, non-sun-synchronous low Earth orbit with a repeat cycle matched to the legacy altimetry constellation. The orbital configuration enabled interleaving with contemporaneous satellites operated by NOAA, EUMETSAT, and NASA for calibration and cross-validation. Precise orbital ephemerides were maintained using data streams from International GNSS Service, DORIS ground beacons, and Satellite Laser Ranging networks hosted by agencies such as NASA and CNES.

Operations and Data Use

Operational control and data acquisition were coordinated between NOAA ground stations and mission operations centers at CNES and EUMETSAT. Level-2 and Level-3 altimetry products were produced for assimilation into operational models run by ECMWF, NOAA National Centers for Environmental Prediction, and regional forecasting centers like Met Office and JMA. Scientific users at NASA Goddard Space Flight Center, European Commission programs, and research universities utilized datasets for sea level trend analysis, ocean heat content estimation, and validation of climate models used in IPCC assessments. The data supported applied uses including coastal flood forecasting, fisheries management by agencies like NOAA Fisheries, and maritime safety initiatives coordinated with International Maritime Organization frameworks.

International Collaboration and Management

The program exemplified multinational partnership with development, launch, and operations roles distributed among NOAA, CNES, EUMETSAT, and NASA. Industrial contractors such as Thales Alenia Space and Northrop Grumman provided spacecraft and payload hardware, while calibration and validation involved institutions like Scripps Institution of Oceanography, Woods Hole Oceanographic Institution, University of Colorado Boulder, and Laboratoire d'Océanographie de Villefranche. Data policy followed open-access principles endorsed by Group on Earth Observations and supported integration into international initiatives including Copernicus and Global Ocean Observing System to inform United Nations climate and sustainable development reporting.

Category:Earth observation satellites Category:Oceanography satellites Category:2016 in spaceflight