两种再分析资料100 m高度风速在湖北地区的检验与订正  

Inspection and Correction of MERRA2 and ERA5 100 m WindSpeed in Hubei

作　　者：王明 孟丹 成驰 许沛华 许杨 陈正洪 WANG Ming;MENG Dan;CHENG Chi;XU Peihua;XU Yang;CHEN Zhenghong(Hubei Meteorological Service Center,Wuhan 430205,China;Hubei Key Laboratory for Heavy Rain Monitoring and Warning Research/Institute of Heavy Rain,China Meteorological Administration,Wuhan 430205,China)

机构地区：[1]湖北省气象服务中心,湖北武汉430205 [2]中国气象局武汉暴雨研究所/暴雨监测预警湖北省重点实验室,湖北武汉430205

出　　处：《沙漠与绿洲气象》2024年第6期8-16,共9页Desert and Oasis Meteorology

基　　金：国家自然科学基金项目(NSFC42175048);国家自然科学基金项目(NSFC42205196);国家重点研发计划(2018YFC1505600);湖北省自然科学基金(2023AFB543);湖北省自然科学基金(2022CFD017);中国气象局创新发展专项(CXFZ2023J044)。

摘　　要：选取湖北不同地形代表的3座测风塔小时风速的观测资料,对MERRA2和ERA5再分析资料100 m高度处的逐时风速数据开展检验和订正。结果表明:(1)MERRA2和ERA5对平原风速的重现效果最好,丘陵次之,高山最差,MERRA2对小时风速的重现效果优于ERA5;(2)MERRA2风速在平原地区和丘陵地区均呈现白天风速小、夜间风速大的日变化特征,在高山地区则相反;ERA5风速在3种地形下均呈现白天风速大、夜间风速小的日变化特征,与观测风速相反;(3)订正后再分析风速与观测风速日变化特征一致,平均风速的绝对偏差均在0.1 m/s左右,正、负相对误差分布较为均匀,再分析风速与观测风速的相关性均提高,均方根误差降低,偏差减少,对高山风速订正效果最好,ERA5订正效果优于MERRA2。Wind speed observation data from three wind towers are selected to evaluate and correct the hourly 100 m wind speed of MERRA2 and ERA5 reanalysis data in Hubei.The results show that:(1)MERRA2 and ERA5 perform the best in plains,followed by hilly areas,and the worst in mountain areas.MERRA2 shows better performance than ERA5 for hourly wind speed;(2)MERRA2 exhibits diurnal variation characteristics with low wind speed during the day and high wind speed at night in both plain and hilly areas,while the opposite is observed in high mountain areas;ERA5 shows a diurnal variation characteristic of high wind speed during the day and low wind speed at night across all terrains,which is opposite to the observed wind speeds;(3)The corrected reanalysis data and observed wind speeds exhibit nearly identical diurnal variation characteristics.Moreover,the absolute deviations of the average wind speeds are around 0.1 m/s,with positive and negative relative errors being relatively evenly distributed.Besides,correlation between the corrected reanalysis and observed wind speeds has improved,and the RMSE and deviation are decreased,which indicates that the correction effect is most effective in high mountain areas and ERA5 performs better after correction.

关 键 词：100 m高度 小时风速 日变化特征 一元线性回归 检验订正 

分 类 号：P425.6[天文地球—大气科学及气象学]