Abstract's details

Fundamental data records for altimetry: 20 years of ERS and Envisat Microwave Radiometer reprocessed data

Marie-Laure Frery (CLS, France)


Mathilde Siméon (CLS, France); Pierre Thibaut (CLS, France); Fanny Piras (CLS, France); Franck Fell (Informus, Germany); Ralph Bennartz (Informus, Germany); Bruno Picard (Fluctus, France); Emma Woolliams (NPL, United Kingdom); Pierre Féménias (ESA/ESRIN, Italy)

Event: 2022 Ocean Surface Topography Science Team Meeting

Session: Instrument Processing: Propagation, Wind Speed and Sea State Bias

Presentation type: Type Poster

Contribution: PDF file


In the framework of the European Long Term Data Preservation Program (LTDP+) which aims to generate innovative Earth system data records named Fundamental Data Records (basically level 1 altimeter and radiometer data) and Thematic Data Records (basically level 2+ geophysical products), ESA/ESRIN has launched a reprocessing activity of ERS-1, ERS-2 and ENVISAT altimeter and radiometer datasets. A large consortium of thematic experts has been formed to take in charge these activities which are 1) to define products including the long, harmonized record of uncertainty-quantified observations, 2) to define the most appropriate level 1 and level 2 processing, 3) to reprocess the whole times series according to the predefined processing and, 4) to validate the different products and provide them to large communities of users focused on the observation of the atmosphere, ocean, coastal, hydrology, sea ice, ice sheet regions.

The level 1 processing of microwave data have been thoroughly reviewed for the three missions. Errors in the processing have been corrected when sufficient information could be found, and radiometric corrections were updated to the latest standards. Uncertainties along the radiometric transfer model are identified and most of them will be evaluated. The aim is to provide the uncertainty for each measurement provided in the Fundamental Data Record. Following previous reprocessing efforts, intercalibration of the three microwave radiometers is achieved with diagnosis such as vicarious calibration over ocean or Amazon Forest. In addition to these harmonized brightness temperatures, a bias-corrected version of the brightness temperatures will be also part of the FDR.

Poster show times:

Room Start Date End Date
Mezzanine Tue, Nov 01 2022,17:15 Tue, Nov 01 2022,18:15
Mezzanine Thu, Nov 03 2022,14:00 Thu, Nov 03 2022,15:45
Marie-Laure Frery