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
卷: 137页: 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 altimetry; Waveform retracldng; Vertical deflection; Gravity anomaly
KeyWords Plus:SATELLITE ALTIMETRY; WAVE-FORMS; GEOID UNDULATIONS; FIELD RECOVERY; RETRACKING; ERS-1; CRYOSAT-2; SURFACE; GEOSAT
作者信息
通讯作者地址: Jin, TY (通讯作者)
| 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:
| [ 1 ] Wuhan Univ, Sch Geodesy & Geomat, Wuhan, Peoples R China |
| [ 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 |
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
