Calibration and evaluation of satellite radar altimeter wave heights with in situ buoy data
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摘要: 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。Abstract: 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.
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Key words:
- SWH /
- HY-2A /
- radar altimeter /
- buoy /
- evaluation /
- calibration
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