Time-varying marine gravity of Bay of Bengal derived from CryoSat-2 altimetry data

被引：0

作者：

Guo J. ^{[1
]}

Zhu F. ^{[1
]}

Liu X. ^{[1
]}

Chang X. ^{[2
]}

机构：

[1] College of Geodesy and Geomatics, Shandong University of Science and Technology, Shandong, Qingdao

[2] Land Satellite Remote Sensing Application Center of MNR, Beijing

来源：

Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2023年 / 51卷 / 03期

关键词：

bay of bengal; CryoSat-2; inverse Vening-Meinesz formula; monthly gravity anomalies; satellite altimetry; time-varying gravity;

D O I：

10.13245/j.hust.230304

中图分类号：

学科分类号：

摘要：

Aiming at the GRACE satellites can only detect gravity variation at a large spatial scale，using altimetry data to derive high spatial resolution time-varying marine gravity was proposed．Firstly，the CryoSat-2 altimetry data were grouped by month，and the residual along-track geoid gradients and gridded deflections of the vertical were calculated based on each group of sea surface heights．Then the inverse Vening-Meinesz formula was used to derive monthly gravity anomalies data．Finally，the CryoSat-2 time-varying gravity with a grid size of 3′ were calculated based on all monthly gravity anomalies data．The Bay of Bengal and adjoining areas was selected as the study area，from February 2011 to April 2020，the annual amplitude and annual phase of CryoSat-2 time-varying gravity are (0.10±0.03) μGal and 98.84°±0.43°，the GRACE data for the same period are (0.66±0.05) μGal and 93.52°±0.08°，which show that their annual signals are consistent．In addition，the linear trend of CryoSat-2 and GRACE time-varying gravity is (0.02±0.01) and (0.09±0.01) μGal/year，both of which show growth．The results show that the CryoSat-2 time-varying gravity data with a grid size of 3′ can reflect the seasonal signals and long-term trend in the study area，the feasibility of deriving high spatial resolution time-varying marine gravity from altimetry data is verified. © 2023 Huazhong University of Science and Technology. All rights reserved.

引用

页码：85 / 91+99

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