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

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0.20~0.28 m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。

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

Satellite altimetry is one of the important way to monitor significant wave height, this paper uses space-time matching method comparing SWH data of radar altimeters on board six satellites that are T/P, Jason-1, Envisat, Jason-2, Cryosat-2 and HY-2A with 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 of 24 a. Matching result yields 53 NDBC buoys, including 7 oceanic buoys, evaluation of accuracy indicates RMSE between 0.4 m and 0.5 m, except T/P, after calibration, RMSE has significantly decreased, a maximum decline is 13.82%; the evaluation result of RMSE in 0.20-0.28 m for oceanic buoys, the evaluation of accuracy is better than all NDBC buoys; after calibration for SWH, there is a little bias between HY-2A satellite radar altimeter data and other 5 foreign satellite radar altimeter data.