摘要
针对进一步提升标准气压外推模型在中国内地地区的精度及可用性的问题,该文利用2004—2014年ERA5气压层数据补偿平均海平面气压(MSLP)的外推误差,顾及残差的时空变化构建了一种优化的气压外推模型(CPM)。基于2015年传感器实测气压的验证结果表明,CPM模型的精度较标准外推模型提升40.6%,对应的静力学(干)延迟(ZHD)不确定度减少3 mm。以2015年无线电探空大气可降水量(PWV)为参考,基于CPM模型计算的GNSS-PWV精度较标准外推模型提升14.9%,且与探空PWV表现出高度相关性。
To further improve the accuracy and availability of the standard pressure extrapolation model in Chinese Mainland,the ERA5 pressure-level data from 2004 to 2014 were used to compensate the errors extrapolated from the mean sea level pressure(MSLP)in this paper,and an optimized pressure extrapolation model(CPM)was constructed taking into account the temporal and spatial variation of the residuals.The verification results based on the measured pressure of the sensors covering the year of 2015 indicated that the accuracy of CPM model was 40.6%higher than that of the standard extrapolation model,and the corresponding zenith hydrostatic delay(ZHD)uncertainty was reduced by 3.0 mm.Taking radiosonde precipitable water vapor(PWV)data covering the year of 2015 as a reference,the accuracy of GNSS-PWV calculated based on CPM model was 14.9%higher than that of standard extrapolation model and showed great correlation with radiosonde derived-PWV.
作者
高祥
蒋春华
王帅民
陈少妮
刘广盛
GAO Xiang;JIANG Chunhua;WANG Shuaimin;CHEN Shaoni;LIU Guangsheng(School of Geomatics,Liaoning Technical University,Fuxin,Liaoning 123000,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;State Key Laboratory of Geodesy and Earths'Dynamics,Innovation Academy for Precision Measurement Science and Technology,CAS,Wuhan 430077,China;College of Mining and Geomatics,Hebei University of Engineering,Handan,Hebei 056038,China)
出处
《测绘科学》
CSCD
北大核心
2023年第10期1-9,共9页
Science of Surveying and Mapping
基金
辽宁省博士启动基金项目(2021-BS-275)
辽宁省教育厅高等学校科学研究项目(LJKMZ20220673)
中国科学院精密测量科学技术创新研究院大地测量与地球动力学国家重点实验室资助项目(SKLGED2023-3-2)。
关键词
气压
天顶静力学延迟
可降水量
ERA5
atmospheric pressure
zenith hydrostatic delay
precipitable water vapor
ERA5
