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Optimizing ?0 information from the Jason-2 altimeter

By Graham D. Quartly

Abstract

A radar altimeter's normalized backscatter, ?0, is used in many oceanographic applications, to infer values of wind speed, wind stress, rain rate and the presence of biogenic slicks. The waveform retracker used to estimate the key geophysical variables for the altimeters on the Jason-1 and Jason-2 satellites shows increased small-scale variability since the problem is ill-conditioned. A simple empirical adjustment to ?0 improves the separability between various parameters and also improves the along-track profiles of ?0. This leads to i) more realistic wind fields, ii) better discrimination of rain events, and iii) improved comparison between the Jason-1 and Jason-2 altimeters during their tandem mission

Topics: GC
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:64865
Provided by: e-Prints Soton

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