Parts of the U.S. Government are closed. This site will not be updated; however NOAA websites and social media channels necessary to protect lives and property will be maintained. See https://www.weather.gov for critical weather information. To learn more, see https://www.commerce.gov.
Data and images displayed on STAR sites
are provided for experimental use only and are
not official operational NOAA products.
Jason Radiometer Stability Monitoring System
The Jason series of satellites provides sustained radar altimetry observations and continuous data on sea surface height (SSH) accurate to within a few centimeters all over the globe, to tell us about variations in surface and deep-water ocean circulation. Jason's ability to measure mean sea level with millimeter accuracy is a key asset for monitoring climate change.
The microwave radiometers on Jason satellites estimate the path delay of radar altimeter caused by atmospheric water vapor. The calibration accuracy and stability (both short and long term) of the radiometer are critical for the Jason mission to meet the stringent requirements. Unfortunately, radiometers are prone to drifts, step jumps, and other types of irregularities that can result in height rate errors comparable to 1 mm/yr, the stability requirement for measuring global mean sea level rise.
The Jason Radiometer Stability Monitoring System is developed by NOAA/NESDIS/STAR to monitor the satbility of Jason Radiometers. This monitoring is performed through comparisons with other microwave radiometers with similar channels at Simultaneous Nadir Overpass (SNO) locations, as well as vicarious techniques. For more information, please click on one of the links below.