Impact of Jason-2 Wind Speed Calibration on the Sea State Bias Correction

Autor: N. Tran, Nicolas Picot, Jean-Christophe Poisson, E. Bronner, P. Thibaut, S. Philipps
Rok vydání: 2011
Předmět:
Zdroj: Marine Geodesy. 34:407-419
ISSN: 1521-060X
0149-0419
Popis: Calibration of the wind speed is an issue not only for the provision of an accurate metocean parameter but also for the stability of the whole altimetry system across several flying missions. Wind speed is one of the parameters used to derive the sea state bias correction and therefore affects the sea surface height measurement. The analysis performed in this paper benefits from an in-house reprocessing exercise of 1 year of Jason-2 data with both the 3- and 4-parameter Maximum Likelihood Estimator (MLE-3, and MLE-4) retracking algorithms. It took into account the new altimeter characterization file that will be used in the upcoming official reprocessing activity to generate version C of the Jason-2 Geophysical Data Record products. Updated comparison of MLE-3 and MLE-4 data confirms that the MLE-3 algorithm gives less high-frequency variations in σ0. A calibration of the Jason-2 wind speed estimates has been performed based on a bias-adjustment of the radar backscatter data (+0.32 dB for MLE-3 data and +...
Databáze: OpenAIRE
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