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Validation of Jason and Envisat Altimeter Dual Frequency Rain Flags

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Abstract:

New rain flags based on the dual frequency capabilities of the new Jason Poseidon-2 and Envisat RA2 altimeters have been tested, developed and adopted for the operational processing of the altimeter data. Their validation conducted during the calibration/validation phases of the satellites is presented here. The Jason flag is validated by comparison with the TOPEX one, using the Tandem mission. The results show a very good agreement between the two sensors and the two rain flags The Envisat flag is validated by comparison with both Jason and TOPEX using global and collocated data sets. The results show similar performances for the three sensors. The f relations estimated during the calibration-validation period and presented here have been given to the altimeter ground processing facilities for operational use.

Keywords: Envisat; Jason; TOPEX; altimeters; dual frequency; rain flag

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/01490410490465616

Affiliations: Laboratoire d'Océanographie Spatiale IFREMER Plouzané France

Publication date: January 1, 2004

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