基于浮标数据的卫星雷达高度计海浪波高数据评价与校正

Calibration and evaluation of satellite radar altimeter wave heights with in situ buoy data

卫星雷达高度计是海浪有效波高（significant wave height,SWH）观测的重要手段之一,本文利用时空匹配方法对T/P、Jason-1、Envisat、Jason-2、Cryosat-2和HY-2A共6颗卫星雷达高度计SWH数据与NDBC（National Data Buoy Center,NDBC）浮标SWH数据进行对比验证,并对雷达高度计SWH数据进行校正。全部卫星雷达高度计SWH数据时间跨度为1992年9月25日到2015年9月1日,对比验证NDBC浮标共53个,包括7个大洋浮标。精度评价发现除T/P外,各卫星雷达高度计SWH的RMSE都在0.4-0.5 m之间,经过校正后,RMSE都有显著下降,下降程度最大为13.82%;对于大洋浮标,评价结果 RMSE在0.20-0.28m之间,结果明显优于全部NDBC浮标的精度评价结果;HY-2A卫星雷达高度计SWH在经过校正后数据质量与国外其他5颗卫星雷达高度计SWH数据质量差异较小。

Satellite altimetry is one of the important way to monitor significant wave height,this paper uses spacetime matching method comparing SWH data of radar altimeters on board six satellites that are T/P,Jason-1,Envisat,Jason-2,Cryosat-2and HY-2Awith SWH data from NDBC buoys,and calibrates SWH data from radar altimeters.All radar altimeters data are chose from September 25,1992 to September 1,2015 for a period of24 a.Matching result yields 53 NDBC buoys,including 7oceanic buoys,evaluation of accuracy indicates RMSE between 0.4mand 0.5m,except T/P,after calibration,RMSE has significantly decreased,a maximum decline is13.82%;the evaluation result of RMSE in 0.20-0.28 mfor oceanic buoys,the evaluation of accuracy is better than all NDBC buoys;after calibration for SWH,there is a little bias between HY-2Asatellite radar altimeter data and other 5foreign satellite radar altimeter data.