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Vertical Deflections and Gravity Disturbances Derived from HY-2A Data
Wan, Xiaoyun1,2; Annan, Richard Fiifi1; Jin, Shuanggen3,4; Gong, Xiaoqi1
2020-07-01
Source PublicationREMOTE SENSING
Volume12Issue:14Pages:17
AbstractThe first Chinese altimetry satellite, Haiyang-2A (HY-2A), which was launched in 2011, has provided a large amount of sea surface heights which can be used to derive marine gravity field. This paper derived the vertical deflections and gravity disturbances using HY-2A observations for the major area of the whole Earth's ocean from 60 degrees S and 60 degrees N. The results showed that the standard deviations (STD) of vertical deflections differences were 1.1 s and 3.5 s for the north component and the east component between HY-2A's observations and those from EGM2008 and EIGEN-6C4, respectively. This indicates the accuracy of the east component was poorer than that of the north component. In order to clearly demonstrate contribution of HY-2A's observations to gravity disturbances, reference models and the commonly used remove-restore method were not adopted in this study. Therefore, the results can be seen as 'pure' signals from HY-2A. Assuming the values from EGM2008 were the true values, the accuracy of the gravity disturbances was about -1.1 mGal in terms of mean value of the errors and 8.0 mGal in terms of the STD. This shows systematic errors if only HY-2A observations were used. An index of STD showed that the accuracy of HY-2A was close to the theoretical accuracy according to the vertical deflection products. To verify whether the systematic errors of gravity field were from the long wavelengths, the long-wavelength parts of HY-2A's gravity disturbance with wavelengths larger than 500 km were replaced by those from EGM2008. By comparing with 'pure' HY-2A version of gravity disturbance, the accuracy of the new version products was improved largely. The systematic errors no longer existed and the error STD was reduced to 6.1 mGal.
KeywordHY-2A vertical deflections gravity disturbance EGM2008
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund
DOI10.3390/rs12142287
WOS KeywordSURFACE HEIGHT MEASUREMENTS ; MEAN SEA-SURFACE ; MARINE GRAVITY ; ALTIMETER ; GRADIENT ; FIELD ; BATHYMETRY ; TOPOGRAPHY ; DERIVATION ; ANOMALIES
Language英语
Funding ProjectNational Natural Science Foundation of China[41674026] ; National Key Research and Development Program of China[2018YFC0603502] ; Fundamental Research Funds for the Central Universities[2652018027] ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences[LSU-KFJJ-201902] ; China Geological Survey[20191006] ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund[M-2017-006]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; Open Research Fund of Key Laboratory of Space Utilization, Chinese Academy of Sciences ; China Geological Survey ; China Geological Survey ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund ; Qian Xuesen Lab.-DFH Sat. Co. Joint Research and Development Fund
WOS Research AreaRemote Sensing
WOS SubjectRemote Sensing
WOS IDWOS:000557070400001
PublisherMDPI
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82464
Collection中国科学院国家天文台
Corresponding AuthorJin, Shuanggen
Affiliation1.China Univ Geosci Beijing, Sch Land Sci & Technol, Beijing 100083, Peoples R China
2.Shanxi Key Lab Resources Environm & Disaster Moni, Jinzhong 030600, Peoples R China
3.Nanjing Univ Informat Sci & Technol, Sch Remote Sensing & Geomat Engn, Nanjing 210044, Peoples R China
4.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
Recommended Citation
GB/T 7714
Wan, Xiaoyun,Annan, Richard Fiifi,Jin, Shuanggen,et al. Vertical Deflections and Gravity Disturbances Derived from HY-2A Data[J]. REMOTE SENSING,2020,12(14):17.
APA Wan, Xiaoyun,Annan, Richard Fiifi,Jin, Shuanggen,&Gong, Xiaoqi.(2020).Vertical Deflections and Gravity Disturbances Derived from HY-2A Data.REMOTE SENSING,12(14),17.
MLA Wan, Xiaoyun,et al."Vertical Deflections and Gravity Disturbances Derived from HY-2A Data".REMOTE SENSING 12.14(2020):17.
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