桂林理工大学学报2024，Vol.44Issue(1)：96-102,7.DOI:10.3969/j.issn.1674-9057.2024.01.013
新疆地区ERA5和MERRA-2大气可降水量精度分析
Accuracy of precipitable water vapor of ERA5 and MERRA-2 in Xinjiang
摘要
Abstract
Atmospheric precipitable water vapor(PWV)is a key parameter to study and monitor weather chan-ges.According to the characteristics of complex terrain,harsh climate environment and insufficient water vapor sampling rate in Xinjiang,the accuracy of the PWV data provided by the latest ERA5 and MERRA-2 atmos-pheric reanalysis data is analyzed,with the PWV(GNSS-PWV)from the data of 11 GNSS stations in Xinjiang in 2018 as the reference value.After verifying the accuracy with the sounding station PWV data,the accuracy of ERA5 and MERRA-2 PWV in Xinjiang is evaluated.The temporal and spatial variation characteristics of the PWV bias(Bias),root mean square error(RMSE)of the two types of analysis data and the diurnal anomaly var-iation are analyzed.The results show that:(1)The annual mean Bias of ERA5 and MERRA-2 in Xinjiang are-0.97 and-1.20 mm.The annual mean RMSE are 1.81 and 2.11 mm.The accuracy PWV in the two kinds of analysis is better.ERA5 PWV is slightly more accurate than MERRA-2 PWV.(2)The PWV accuracy of both analysis data has obvious seasonal variation,generally low in summer and high in winter.(3)In terms of the di-urnal variation of PWV,the two analysis data show high consistency with GNSS-PWV,indicating better diurnal variation of PWV in Xinjiang.Therefore,the two reanalysis data have high accuracy and stability in the PWV of Xinjiang,and is an important data source to study the water vapor change in Xinjiang.关键词
大气可降水量/ERA5/MERRA-2/新疆Key words
PWV/ERA5/MERRA-2/Xinjiang分类
天文与地球科学引用本文复制引用
刘喆栋,黄良珂,刘立龙,黄玲,郭希,廖发圣..新疆地区ERA5和MERRA-2大气可降水量精度分析[J].桂林理工大学学报,2024,44(1):96-102,7.基金项目
国家自然科学基金项目(41704027 （）
41864002 （）
41664002) （）
国家重点研发计划项目(SQ2018YFC150052) （SQ2018YFC150052）
广西自然科学基金项目(2017GXNSFBA198139 （）
2017GXNSFDA198016 （）
2018GXNSFAA281182) （）
广西"八桂学者"岗位专项 （）
广西空间信息与测绘重点实验室项目(19-050-11-02) （19-050-11-02）
