HUST-CRA:A New Atmospheric De-Aliasing Model for Satellite Gravimetry  

作　　者：Weihang ZHANG Fan YANG Yi WU Hailong LIU Tao ZHANG Zhicai LUO Ehsan FOROOTAN 

机构地区：[1]School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China [2]Geodesy Group,Department of Sustainability and Planning,Aalborg University,Aalborg 9000,Denmark [3]Laoshan Laboratory,Qingdao 266237,China [4]Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China [5]National Meteorological Information Center,China Meteorological Administration(CMA),Beijing 100081,China

出　　处：《Advances in Atmospheric Sciences》2025年第2期382-396,共15页大气科学进展(英文版)

基　　金：financial support from the National Natural Science Foundation of China(Grant Nos.42274112 and 41804016);supported by Danmarks Frie Forskningsfond[https://doi.org/10.46540/2035-00247B]through the DANSk-LSM project and HPC Platform of Huazhong University of Science and Technology。

摘　　要：Atmospheric de-aliasing is one of the most important background models for recovering Earth's temporal gravity field from gravity satellite missions.To meet the needs of China's gravimetric satellite platform,an independent atmospheric dealiasing model that relies on Chinese meteorological data needs to be developed.The release of CRA-40,as the firstgeneration Chinese atmospheric reanalysis,provides the opportunity.This study proposes a revised modeling method to calibrate CRA-40 and develops a new atmospheric de-aliasing model(HUST-CRA,2002-20).Intensive assessments are made between HUST-CRA and the latest official de-aliasing product of the international gravity satellite mission.The tidal components of the two products demonstrate high consistency,e.g.,the spatial correlation for the major tide S_1 is 0.96.The non-tidal components of the two products are also equivalent:(1)the temporal correlation of low-degree terms is higher than 0.97,except for the term of S22(0.93);(2)the spectral correlation of degree geoid height up to degree/order 100 is as high as 0.99;(3)the confidence interval of the spatial correlation(2002-20)is[0.971,0.995]at a confidence level of 95%;and(4)the difference in KBRR(K-band range rate)residuals is less than 0.08μm s^(-1),the difference in the derived temporal gravity field is less than 0.32 mm in terms of geoid height,and both are apparently beyond the ability of the current gravity satellite mission.This confirms that CRA-40 is of high quality and that the derived de-aliasing product,HUST-CRA,is accurate enough to be used in both Chinese and international gravity satellite missions.

关 键 词：CRA-40 atmospheric de-aliasing gravity satellite temporal gravity field 

分 类 号：P223.4[天文地球—大地测量学与测量工程]