EVALUATION OF ASCAT AND HY-2A SATELLITE SCATTEROMETER WINDS VECTORS IN THE SOUTH CHINA SEA
ZHANG Kai-feng
DENG Wan-yue
ZHOU Cheng-jun
XIANG Jie
MA Wei-min
Abstract：The study presents a quality assessment of ASCAT and HY-2A scatterometer sea surface wind data based on comparison with automatic weather stations (AWS) data from Xisha observation station,which was established by the Institute of South China Sea Oceanography,Chinese Academy of Science,and numerical model data from European Center for Medium Range Weather Forecasts (ECMWF) during January 1,2012-December 31,2013,to verify the applicability of two scatterometer in the South China Sea.The results show that the scatterometer data have a good consistency and large correlation with the AWS,with the correlation coefficient being greater than 0.85.The root-mean-squared error (RMSE) of wind speed and direction is 1.57 m/s and 15.42 ° for ASCAT,and 2.02m/s and 24.75 ° for HY-2A,respectively.The scatterometer data also have a good consistency with ERA-interim.Ignoring the low wind (＜3 m/s),the RMSE of wind speed between scatterometer and model is 1.40m/s for ASCAT,and 1.56m/s for HY-2A,and the RMSE of wind direction is both smaller than 20 °,15.09 ° and 17.07 ° respectively,which can satisfy the design requirements for a scatterometer.These evaluation results indicate that the wind data from ASCAT and HY-2A is applicative in the South China Sea.Besides,and no clear seasonal variation exists for the residuals between the scatterometer and the ERA-interim.
Keywords：automatic weather stationscatterometersea surface winds fieldevaluation
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 774-781 )