ERA5风场资料在江苏近岸海域的初步评估

Preliminary assessment of ERA5 wind data in Jiangsu sea area

ERA5数据和台站观测资料对于研究区域水文气象和环境特征均具有重要意义。研究采用江苏近岸海域五个海上平台的观测数据,对ERA5再分析风场数据的准确性进行评估。结果表明,ERA5风数据与各站的实测数据基本一致,风速的一致性明显优于风向。ERA5与各观测站的风向一致性在秋冬季节优于春夏季节。随着风速的增加,ERA5与平台实测的风速(风向)的平均绝对误差和均方根误差显著增大(减小)。台风影响期间,在风速增加和风向转变方面,ERA5风资料与平台观测资料具有很好的一致性;但ERA5风速较平台实测数据略偏低。研究结果可为ERA5风资料在江苏近海海域的应用和进一步研究提供依据。

ERA5 data and station observation data are both of great importance in studying the regional meteorological and environmental characteristics.The accuracy of ERA5 reanalysis wind field data was evaluated using observations at five offshore platforms in Jiangsu sea area in this study.Results revealed that ERA5 wind speed was generally in reasonable agreement with that observed at each station,and that the accuracy of ERA5 wind speed data was significant better than that of wind direction.The consistency of wind direction between ERA5 and each observation station was better in autumn and winter than that in spring and summer.With increasing wind speed,the mean absolute error and root mean squared error between the ERA5 and observed wind speed(direction)data increased(decreased)obviously.During periods of typhoon,ERA5 wind data were largely consistent with observational data in terms of increasing wind speed and changing wind direction;however,the ERA5 wind speeds were slightly low.The findings of this study could provide a basis for the application and further research of ERA5 wind data in Jiangsu offshore sea area.