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[SCI]Inversion of marine gravity anomalies over southeastern China seas from multi-satellite altimeter vertical deflections

时间:2017-05-03 来源:未知 点击:
作者:Zhang, SJ (Zhang, Shengjun)[ 1 ] ; Sandwell, DT (Sandwell, David T.)[ 2 ] ; Jin, TY (Jin, Taoyong)[ 1,3 ] ; Li, DW (Li, Dawei)[ 1,3 ]
JOURNAL OF APPLIED GEOPHYSICS
: 137 : 128-137
DOI: 10.1016/j.jappgeo.2016.12.014
出版年: FEB 2017
摘要
The accuracy and resolution of marine gravity field derived from satellite altimetry mainly depends on the range precision and dense spatial distribution. This paper aims at modeling a regional marine gravity field with improved accuracy and higher resolution (1' x V') over Southeastern China Seas using additional data from CryoSat-2 as well as new data from AltiKa. Three approaches are used to enhance the precision level of satellite-derived gravity anomalies. Firstly we evaluate a suite of published retracking algorithms and find the two-step retracker is optimal for open ocean waveforms. Secondly, we evaluate the filtering and resampling procedure used to reduce the full 20 or 40 Hz data to a lower rate having lower noise. We adopt a uniform low-pass filter for all altimeter missions and resample at 5 Hz and then perform a second editing based on sea surface slope estimates from previous models. Thirdly, we selected WHU12 model to update the corrections provided in geophysical data record. We finally calculated the 1' x 1' marine gravity field model by using EGM2008 model as reference field during the remove/restore procedure. The root mean squares of the discrepancies between the new result and DTU10, DTU13, V23.1, EGM2008 are within the range of 1.8-3.9 mGal, while the verification with respect to shipboard gravity data shows that the accuracy of the new result reached a comparable level with DTU13 and was slightly superior to V23.1, DTU10 and EGM2008 models. Moreover, the new result has a 2 mGal better accuracy over open seas than coastal areas with shallow water depth. (C) 2016 Elsevier B.V. All rights reserved.
关键词
作者关键词:Satellite altimetryWaveform retracldngVertical deflectionGravity anomaly
KeyWords Plus:SATELLITE ALTIMETRYWAVE-FORMSGEOID UNDULATIONSFIELD RECOVERYRETRACKINGERS-1CRYOSAT-2SURFACEGEOSAT
作者信息
通讯作者地址Jin, TY (通讯作者)

http://images.webofknowledge.com/WOKRS524B8/images/zh_CN/expand.gif Wuhan Univ, Sch Geodesy & Geomat, Wuhan, Peoples R China.
通讯作者地址Jin, TY (通讯作者)
       Minist Educ, Key Lab Geospace Environm & Geodesy, Wuhan, Peoples R China.
地址:
http://images.webofknowledge.com/WOKRS524B8/images/zh_CN/expand.gif [ 1 ] Wuhan Univ, Sch Geodesy & Geomat, Wuhan, Peoples R China
http://images.webofknowledge.com/WOKRS524B8/images/zh_CN/expand.gif [ 2 ] Scripps Inst Oceanog, La Jolla, CA USA
       [ 3 ] Minist Educ, Key Lab Geospace Environm & Geodesy, Wuhan, Peoples R China
基金资助致谢
基金资助机构 授权号
973 Project of China  2013CB73301 
2013CB73302 
National Natural Science Foundation of China  41210006 
41304003 
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, China  20150209 
National Geospatial-Intelligence Agency  HM0177-13-1-0008 
NASA SWOT program  NNX16AH64G 
查看基金资助信息   
出版商
ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
类别 / 分类
研究方向:Geology; Mining & Mineral Processing
Web of Science 类别:Geosciences, Multidisciplinary; Mining & Mineral Processing
文献信息
文献类型:Article
语种:English
入藏号: WOS:000395841400013
ISSN: 0926-9851
eISSN: 1879-1859
期刊信息
·   Impact Factor (影响因子): 1.355