Improving the wind and wave estimation of dual-frequency altimeter JASON1 in Typhoon Shanshan and considering the rain effects

摘要

Altimetry data have been widely used in various fields of oceanography,including the extreme weather events such as tropical cyclones,typhoons,and hurricanes. The performance of JASON1 in Typhoon Shanshan is assessed by examining the sensor geophysical data record and illustrates how the measured return waveform,significant wave height,and backscatter are all affected by various factors associated with the typhoon,with details by the rain are illustrated. The correction method to maintain accurate wave height and wind speed measurements in Typhoon Shanshan and the results are presented. Furthermore,the additional results of rain rate and typhoon eye diameter can be retrieved. Because of the lack of in-situ measurements of wind,wave,and rain rate at Typhoon Shanshan,results are compared with the forecasted typhoon data and a good agreement is found.