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Water storage variations in the Poyang Lake Basin estimated from GRACE and satellite altimetry

Geodesy and Geodynamics 2016年第2期7卷 108-116页

作者： Yang Zhou Shuanggen Jin robert tenzer Jialiang Feng School of Environment and Chemical Engineering Shanghai UniuersityShanghai 200444China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China School of Geodesy and Geomatics Wuhan UniuersityWuhan 430079China

The Gravity Recovery and Climate Experiment（GRACE） satellite mission provides a unique opportunity to quantitatively study terrestrial water storage（TWS） variations. In this paper,the terrestrial water storage variations in the Poyang Lake Basin are recovered from the GRACE gravity data from January 2003 to March 2014 and compared with the Global Land Data Assimilation System（GLDAS） hydrological models and satellite altimetry. Furthermore, the impact of soil moisture content from GLDAS and rainfall from the Tropical Rainfall Measuring Mission（TRMM） on TWS variations are investigated. Our results indicate that the TWS variations from GRACE, GLDAS and satellite altimetry have a general consistency. The TWS trends in the Poyang Lake Basin determined from GRACE, GLDAS and satellite altimetry are increasing at 0.0141 km^3/a, 0.0328 km^3/a and 0.0238 km^3/a,respectively during the investigated time period. The TWS is governed mainly by the soil moisture content and dominated primarily by the precipitation but also modulated by the flood season of the Yangtze River as well as the lake and river exchange water.

关键词： Gravity Recovery and Climate Experiment(GRACE) Satellite altimetry Terrestrial water storage variations Poyang Lake Basin

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Crustal thickness beneath Atlas region from gravity,topographic,sediment and seismic data

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Geodesy and Geodynamics 2020年第1期11卷 18-30页

作者： Franck Eitel Kemgang Ghomsi robert tenzer Sévérin Nguiya Animesh Mandal robert Nouayou Department of Physics The University of YaoundeⅠYaoundeCameroon Department of Land Surveying and Geo-Informatics Hong Kong Polytechnic UniversityHong KongChina Faculty of Industrial Engineering University of DoualaDoualaCameroon Department of Earth Sciences Indian Institute of TechnologyKanpurIndia

The Atlas region in northwest Africa is characterized by the Quaternary volcanism and elevated topography with past complex tectonic mitigation between the African and European *** of this atypical region has left indubitably imprints in crustal architectonics,mainly regarding the crustal thickness as well as the crustal density *** knowledge of crustal thickness variations is of a significant interest,since it provides a crucial constraint to geodynamic and geophysical modelling of this *** this study,we use gravity,topographic,bathymetric and sediment data together with results of seismic surveys to image the Moho topography beneath the Atlas *** Bouguer gravity anomalies used for a gravimetric Moho recovery are obtained from the free-air gravity anomalies after subtracting the gravitational contributions of topography,bathymetry and *** regional gravimetric Moho inversion constrained on seismic data is carried out by applying a regularized inversion technique based on Gauss-Newton’s formulation of improved Bott’s method,while adopting Earth’s spherical *** numerical result reveals relatively significant Moho depth variations in the Moroccan Atlas,with minima of approximately 24 km along continental margins of the Mediterranean Sea and maxima exceeding 51 km beneath the Rif *** Moho depth beneath the West African Craton varies from 32 km in its southern margin to 45 km beneath the Middle *** Tell Atlas is characterized by the shallow Moho depth of approximately 22 km and further deepening to 42 km towards the northern edge of the Aures *** findings indicate a limited tectonic shortening of the High Atlas with the crustal thickness mostly within 36-42 *** discrepancies between the Rif Cordillera and the Atlas Mountains suggest that the hypothesis of isostatic compensation cannot be fully established.

关键词： Atlas Gravity Inversion Moho Seismic data

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Reformulation of the Vening-Meinesz Moritz Inverse Problem of Isostasy for Isostatic Gravity Disturbances

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International Journal of Geosciences 2012年第5期3卷 918-929页

作者： robert tenzer Mohammad Bagherbandi Division of Geodesy and Geoinformatics Royal Institute of Technology (KTH) Stockholm Sweden National School of Surveying University of Otago Dunedin New Zealand

The isostatic gravity anomalies have been traditionally used to solve the inverse problems of isostasy. Since gravity measurements are nowadays carried out together with GPS positioning, the utilization of gravity disturbances in various regional gravimetric applications becomes possible. In global studies, the gravity disturbances can be computed using global geopotential models which are currently available to a relatively high accuracy and resolution. In this study we facilitate the definition of the isostatic gravity disturbances in the Vening-Meinesz Moritz inverse problem of isostasy for finding the Moho depths. We further utilize uniform mathematical formalism in the gravimetric forward modelling based on methods for a spherical harmonic analysis and synthesis of gravity field. We then apply both mathematical procedures to determine globally the Moho depths using the isostatic gravity disturbances. The results of gravimetric inversion are finally compared with the global crustal seismic model CRUST2.0;the RMS fit of the gravimetric Moho model with CRUST2.0 is 5.3 km. This is considerably better than the RMS fit of 7.0 km obtained after using the isostatic gravity anomalies.

关键词： Crust Gravity Isostasy Moho Interface Spherical Harmonics

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地震变形中引力曲率变化的探索与应用

地震变形中引力曲率变化的探索与应用

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2023年中国地球科学联合学术年会

作者：吉煜庭 robert tenzer 唐河孙文科

本研究的目的是建立一种描述引力势曲率同震变化的方法,以加强对地震变形的观测和认识。引力势曲率是地球引力势的三阶导数,用27个分量的三维张量矩阵表示,其中9个分量是独立的。为此,我们首先研究了地球引力势的位错Love数,并推导了球... 详细信息

本研究的目的是建立一种描述引力势曲率同震变化的方法,以加强对地震变形的观测和认识。引力势曲率是地球引力势的三阶导数,用27个分量的三维张量矩阵表示,其中9个分量是独立的。为此,我们首先研究了地球引力势的位错Love数,并推导了球形非均匀地球模型中由四个独立点源引起的引力势曲率的格林函数,然后给出了球形地球模型的变化形式。

关键词：引力势地震变形曲率变化探索与应用

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利用重力卫星探测高阶同震重力梯度变化的可行性研究

利用重力卫星探测高阶同震重力梯度变化的可行性研究

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2023年中国地球科学联合学术年会

作者：吉煜庭 robert tenzer 唐河孙文科

重力场与稳态海洋环流探测（GOCE）携带一套卫星重力梯度仪（SGG）,用于获取重力梯度变化,这为我们研究同震重力梯度变化提供了一个最为直接的技术手段。由于GOCE任务直接测量的是重力梯度变化这一高频物理量,因此包含了GRACE所缺乏的... 详细信息

重力场与稳态海洋环流探测（GOCE）携带一套卫星重力梯度仪（SGG）,用于获取重力梯度变化,这为我们研究同震重力梯度变化提供了一个最为直接的技术手段。由于GOCE任务直接测量的是重力梯度变化这一高频物理量,因此包含了GRACE所缺乏的独特短波信息。在本研究中,我们使用GOCE Level2的EGGOM和SSTSO数据来获得重力梯度的时变变化。

关键词：重力梯度重力卫星可行性研究

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Evolution of stress fields during the supercontinent cycle

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Geodesy and Geodynamics 2022年第4期

作者： Alexander Bobrov Alexey Baranov robert tenzer

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ETH-GQS: An estimation of geoid-to-quasigeoid separation over Ethiopia

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Geodesy and Geodynamics 2022年第1期

作者： Ephrem Y.Belay Walyeldeen Godah Malgorzata Szelachowska robert tenzer

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