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AN L-BAND WIND RETRIEVAL MODEL FUNCTION DERIVED FROM PALSAR

An empirical relation between normalized radar cross sections (NRCS) and wind vectors, known as the geophysical model function (GMF), has been established for specific wavelengths, such as Ku-band and C-band, by using scatterometermeasured NRCS and buoy or model winds [1][2]. On the contrary, L-band NRCS dependence on wind fields has been investigated by using airborne and spaceborne Synthetic Aperture Radar (SAR) data [3][4]. However, because these spaceborne L-band SAR were operated with a constant off-nadir angle, their results don’t cover the incidence angle dependency. The Phased-Array L-band Synthetic Aperture Radar (PALSAR) onboard the Advanced Land Observing Satellite (ALOS), can observe the Earth with various off-nadir angles and has a ScanSAR function that enabled us to investigate the incidence angle dependency. In this study, we investigate the comprehensive dependence of the L-band HH NRCS on wind fields by using the PALSAR-derived NRCS and co-located wind data to propose an L-band model function for PALSAR.