中法海洋卫星与ERA5数据在中国邻近海域的波高对比分析

Comparison analysis of wave height in China's adjacent seas between CFOSAT and ERA5 data

中法海洋卫星CFOSAT搭载的高性能海浪谱仪SWIM获得了连续、大范围的海浪数据。CFOSAT海浪波高数据在全球范围已开展了许多验证与校准工作,但大多是与站点数据的比对,将卫星数据应用于面域波浪场特性研究时缺乏与已有成熟数据集的对比。通过将中国邻近海域作为研究区域,对CFOSAT与ERA5数据的有效波高进行对比,分析了二者间的差异。结果表明,CFOSAT数据与ERA5数据在波浪的面域观测上表现相似,相关性较高;二者有效波高的差值呈现季节变化特征,秋冬季节的数据离散程度较大,春夏季节较稳定;随海浪高度的增加,CFOSAT与ERA5数据的差异明显增加。

The CFOSAT(Chinese-French Oceanography Satellite)equipped with the high-performance wave spectrometer SWIM has obtained continuous and extensive wave data.While CFOSAT wave data have undergone numerous validations and calibrations globally,most comparisons have been made with buoy data.There is a lack of contrast with existing mature datasets when applying satellite data to the study of wave field characteristics.By focusing on the China's adjacent seas,comparing the significant wave heights(SWH)between CFOSAT and ERA5 data and analyzing their differences.The results show that the CFOSAT data and ERA5 data exhibit similar performance and high correlation in wave field observations;The dfference in SWH between them shows seasonal variation characteristics,with a greater degree of dispersion in the autumn and winter seasons and a more stable in the spring and summer seasons;With the increase of wave height,the bias between CFOSAT and ERA5 data significantly increases.