摘要
为系统性分析ERA5大气再分析数据在复杂地形区域全球导航卫星定位系统(Global Navigation Satellite System,GNSS)水汽反演中的适用性,利用2017年ERA5气象资料与GNSS观测数据,在青藏高原开展高精度GNSS水汽反演研究,系统验证ERA5在复杂地形区域的适用特征。首先,利用无线电探空数据验证青藏高原ERA5地面气温和气压的精度,并计算对流层干延迟与大气加权平均温度;其次,基于非差非组合精密单点定位解算天顶对流层总延迟;最后,对青藏高原地区的GNSS大气水汽进行反演,并对反演结果进行系统验证。结果表明:ERA5气温和气压数据在青藏高原地区平均RMS/Bias分别为2.20/1.79hPa和3.33/0.71K,利用其反演水汽误差仅为1.23mm,具有可靠精度;计算得到的大气加权平均温度与无线电探空加权平均温度吻合,RMS/STD/Bias分别为2.19/1.83/0.45K;反演的GNSS水汽与无线电探空和ERA5水汽进行对比,其平均RMS分别为2.52mm和2.40mm,具有较高精度。研究成果对该地区GNSS数据拓展应用具有重要意义,也为全球类似地形区GNSS水汽反演技术推广提供了重要参考依据。
To systematically evaluate the applicability of ERA5 atmospheric reanalysis dataset for GNSS water vapor retrieval in complex terrain,this study conducted high-precision GNSS water vapor retrieval research on the Qinghai-Tibetan Plateau using ERA5meteorological dataand GNSS observationdata from 2017,systematically verifying the applicability characteristics of ERA5 in complex terrain areas.First,the accuracy of ERA5 surface temperature and surface pressure on the Qinghai-Tibetan Plateau was validated using radiosonde data,and the zenith tropospheric delay and weighted average tempera-ture were calculated.Second,the zenith total tropospheric delay was calculated based on undifferenced and uncombined precise point positioning.Finally,GNSSprecipitation water vapor(PWV)was retrieved over the Qinghai-Tibetan Plateau region,and the retrieval results are systematically validated.The results demonstrate that:The average RMS/Bias of ERA5 pressure and temperature data achieve values of 2.20/1.79 hPa and 3.33/0.71K,respectively,which is equivalent to a PWV error of 1.23 mm,and the accuracy is reliable.The derived atmospheric weighted average temperature aligns well with ra-diosonde-derived values,yielding RMS/STD/Bias values of 2.19/1.83/0.45K.Finally,the GNSS PWV is compared with radiosondeand ERA5 PWV,and the average RMS is 2.52 mm and 2.40 mm respectively,indicating that the retrieval results have high accuracy.The research results hold significant implications for expanding GNSS data applications in this region and provide an important reference foundation for promoting GNSS water vapor retrieval technologies in similar global terrain regions.
作者
崔娟
黄允政
张笑宁
马雄伟
许双安
CUI Juan;HUANG Yunzheng;ZHANG Xiaoning;MA Xiongwei;XU Shuang'an(Northwest Nonferrous Geology and Mining Group Co.,Ltd.,Xi'an 710054,China;College of Geomatics,Xi'an University of Science and Technology,Xi'an 710054,China;China Railway First Survey&Design Institute Group Co.,Ltd.,Xi'an 710043,China;Shaanxi Railway and Underground Traffic Engincering Key Laboratory,Xi'an 710043,China)
出处
《西安科技大学学报》
北大核心
2025年第6期1243-1253,共11页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(42404041)
陕西省关键核心技术攻关项目(2024SF2-GJHX-54)。
