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Spectral analysis of quasi-stationary sea surface topography from GRACE mission

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Science china Earth {1. 2005年第11期48卷 2040-2048页

作者： zhang Zizhan1.2 & LU Yang1.3.1. Institute of {1. and Geophysics, chinese academy of sciences, wuhan 43.077, china 2. Graduate School of the chinese academy of sciences, Beijing 1.003., china 3. Unite Center for Astro-geodymics Research, chinese academy of sciences, Shanghai 20003., china Institute of geodesy and Geophysics Chinese Academy of Sciences Wuhan China Graduate School of the chinese {1. of sciences Beijing China Unite Center for Astro-geodymics Research Chinese Academy of Sciences Shanghai China

During the last two decades satellite altimetry has offered an abundance of meas-urements of the sea surface resulting in the improvement of global mean sea surface height (MSSH) and marine geoid determination. On the other hand, with the launching of new genera-tion gravity satellites, some high accuracy long-wavelength gravity models are available. These breakthroughs give us a great opportunity for new estimation of quasi-stationary sea surface topography (QSST). In this paper, the new gravity model GGM01. derived from GRACE mission is briefly presented, and a new global high precision and high-resolution QSST is determined based on the GGM01. model and the global MSSH. The spectral features of the QSST esti-mated by GGM01. and EGM96 gravity model to degree/order 200 are discussed by spectral analysis. As a result, the QSST is mainly composed of long waves, medium waves partially and short waves scarcely, its power spectral structures are different between the zonal direction and the meridional direction, there are great differences between the two models, which maybe ex-plain why the ocean currents derived from the two gravity models by Tapley show different pat-terns.

关键词： quasi-stationary sea surface topography, mean sea surface height, GGM01. fast Fourier transform, spectral analysis

Determination of vertical gradient of gravity anomaly with topographic data

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chinese Science Bulletin 1999年第11期44卷 1029-1034页

作者： zhang {1.Institute of geodesy and Geophysics ,{3., wuhan 43.077 , china Institute of geodesy and Geophysics Chinese Academy of Sciences Wuhan China

The role of vertical gradient of gravity anomaly in the solution and interpretation of geological and geophysical problems on superficial layer is increasingly evident. However, it is difficult to directly observe the vertical gradient of gravity anomaly in mountainous area. Moreover,aerial and satellite gravity gradient measurments have not been put into practice up to date *** vertical gradient of gravity anomaly is calculated by use of topographic data and several problems concerned are investigated and discussed. It turns out in theory and practice that the relative error of the vertical gradient determined with the method is only 5%, and when the vertical gradient of gravity anomaly reaches the maximum 1.000 ns-2 the error is only 50 ns-2. In addition, how to divide ring zones in calculation and the errors caused by the inaccuracy of landform elevation and rock density has been quantitatively analysed.

关键词： vertical gradient gravity anomaly topographic mass geoid.

Architecture and application of integrated spatial information service platform for digital mine

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中国有色金属学会会刊：英文版 2011年第S3期21卷 706-711页

作者： zhang Jin1. XIAO Jie2 1. College of Mining, Taiyuan University of Technology, Taiyuan 03.024,{1. 2. Institute of geodesy and Geophysics, chinese academy of sciences, wuhan 43.077,{1. College of Mining Taiyuan University of Technology Taiyuan 030024 China Institute of geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China

Using enterprise GIS platform, spatial databases and modern information technology, building geo-spatial information service platform of digital mine which has the features of the data exchange service, enterprise GIS services, directory services, logging services, is key technology and application infrastructure for digital mine. Based on the support of geospatial information service platform of digital mine, the professional GIS application service adapter can be developed and the application supports related to mining application system can be realized. Using high-resolution satellite remote sensing data, the mine functional partition map and geographic grids can be divided, and the geographic grid parts, status and events of important features of the surface object were investigated and defined. The system architecture and technical characteristics of integrated spatial information service platform were analyzed firstly, which guarantee service ability of digital mine. The methods and applications of functional partition map for integrated management service platform were discussed which are the services scheme of digital mine. The application results indicated that digital mine upgrades and enhances the capability and range of mine surveying and mapping, and is of great significance for guarantee of efficient, green and intensive exploitation of mine.

关键词： platform architecture web services application services digital mine

The GPS-gravimetry boundary value problem

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Science china Earth {1. 2005年第3期48卷 398-405页

作者： YU Jinhai1.2 & zhang Chuanding2 1. Institute of {1. and Geophysics of chinese academy of sciences, wuhan 43.077, china 2. Zhengzhou Information Engineering University, Zhengzhou 450052, china Institute of geodesy and Geophysics of {1. academy of {3. Wuhan China Zhengzhou Information Engineering University Zhengzhou China

How to determine the earth’s external gravity field with the accuracy of O(T2) by making use of GPS data and gravity values measured on the earth’s surface is dealt with in this paper. There are two main steps: to extend these measured values on the earth’s surface onto the reference ellipsoid at first and then to seek for the integral solution of the external Neumann problem outside the ellipsoid. In addition, the corresponding judging criteria of accuracy to solve the GPS-gravity boundary value problem are established. The integral solution given in the paper not only contains all frequency-spectral information of the gravity field with the accuracy of O(T 2), but is also easily computed. In fact, the solution has great significance for both theory and prac- tice.

关键词： Neumann boundary value problem, integral solution, gravity disturbance.

Interactions between hotspots and the Southwest Indian Ridge during the last 90 Ma:Implications on the formation of oceanic plateaus and intra-plate seamounts

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Science china Earth {1. 2011年第8期54卷 1177-1188页

作者： zhang Tao 1.2,3.4,LIN Jian 5 & GAO JinYao 3.4 1.Institute of {1. and Geophysics,chinese academy of sciences,wuhan 43.077,china 2 Graduate University of chinese academy of sciences,Beijing 1.0049,china 3.The Second Institute of Oceanography,State Oceanic Administrator,Hangzhou 3.1}01.,china 4 Key Laboratory of Submarine Geosciences,State Oceanic Administrator,Hangzhou 3.1}01.,china 5 Department of Geology and Geophysics,Woods Hole Oceanographic Institution,Woods Hole,MA 02543.USA Institute of geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 China

This study investigates the relationship between the hotspot-ridge interaction and the formation of oceanic plateaus and seamounts in the Southwest Indian *** first calculated the relative distance between the Southwest Indian Ridge (SWIR) and relevant hotspots on the basis of models of plate reconstruction,and then calculated the corresponding excess magmatic anomalies of the hotspots on the basis of residual bathymetry and Airy *** results reveal that the activities of the Marion hotspot can be divided into three main phases:interaction with the paleo-Rodrigues triple junction (73.6-68.5 Ma),interaction with the SWIR (68.5-42.7 Ma),and intra-plate volcanism (42.7-0 Ma).These three phases correspond to the formation of the eastern,central,and western parts of the Del Cano Rise,*** magnitude and apparent periodicity of the magmatic volume flux of the Marion hotspot appear to be dominated by the hotspot-ridge *** periodicity of the Marion hotspot is about 25 Ma,which is much longer than that of the Hawaii and Iceland hotspots (about 1. Ma).

关键词： Southwest Indian Ocean hotspot-ridge interaction magmatic volume flux oceanic plateaus seamounts

Triaxial ellipsoid models of the Moon based on the laser altimetry data of Chang'E-1

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Science china Earth {1. 2010年第11期53卷 1594-1601页

作者： WANG WenRui1.2,3. LI Fei1. LIU JianJun1. REN Xin2, ZOU XiaoDuan2,3. MU LingLi2, YAN JianGuo1. ZOU YongLiao2, zhang HongBo2, Lü Chang2, LIU JianZhong2, ZUO Wei2, SU Yan2, WEN WeiBin2, BIAN Wei2, WANG Min2, LI ChunLai2 & OUYANG ZiYuan2 1.School of {1. and Geomatics, wuhan University, wuhan 43.079, china 2 National Astronomical Observatory of chinese academy of sciences, Beijing 1.001., china 3.Graduate School of chinese academy of sciences, Beijing 1.0049, china School of geodesy and Geomatics Wuhan University Wuhan China National Astronomical Observatory of chinese {1. of sciences Beijing China Graduate School of chinese {1. of sciences Beijing China

Lunar geodetic parameters, which play an important role in lunar exploration, can be calculated from the gravity and topography data. With the CE-1.altimetry data and LP gravity model, we calculate such geodetic parameters as the principle moment of inertia, the principle inertia axes, equatorial radius, polar radius, mean radius, flattening and offset between center of mass and center of figure (DCOM-COF). According to the CE-1.altimetry data and the above geodetic parameters, a tri-axial ellipsoid (CE-1.LAM-GEO) and a tri-axial level ellipsoid (CE-1.LAM-LEVEL) are calculated individually, providing mass center and figure center offset (DCOM-COF) and parameters more reliable in direction and magnitude.

关键词： Chang’E-1 laser altimetry data lunar ellipsoid lunar gravity

A numerical study on nonlinear propagation and short-term variability of the migrating diurnal and semidiurnal tides

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chinese Science Bulletin 2005年第17期50卷 1940-1948页

作者： HUANG Chunming1.2, zhang Shaodong1.2 & YI Fan1.2 1. School of Electronic Information, {1. Universiy, {1. 43.079, china 2. Key Laboratory of Geospace Environment and geodesy, Ministry of Education, {1. University, {1. 43.079, china School of Electronic Information Wuhan University Wuhan 430079 China Key Laboratory of Geospace Environment and geodesy Ministry of Education Wuhan University Wuhan 430079 China

By using a three-dimensional fully nonlinear numerical model in spherical coordinates and taking the linear steady solutions of the migrating diurnal and semidi-urnal tides in January from the Global-Scale Wave Model (GSWM) as the initial values, we simulate the linear and nonlinear propagations of the migrating diurnal and semidi-urnal tides in the atmosphere from the ground to the lower thermosphere. A comparison of our simulations with the results of GSWM is also presented. The simulation results show that affected by the nonlinearity, the migrating diurnal and semidiurnal tides propagating in the middle and upper atmosphere exhibit evident short-term variability. The nonlinear interactions between the migrating tides and the background atmosphere can obviously alter the background wind and temperature fields, which suggests that the nonlin-ear propagations of the migrating diurnal and semidiurnal tides impact significantly on the transient dynamical and thermal structures of the background middle and upper at-mosphere and the nonlinear effect is an important cause of the difference between the results of GSWM and observa-tions.

关键词：大气非线性传播数学模型可变性温度场

Method of multi-level recursive and application to nonlinear dynamic deformation forecasting

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中国有色金属学会会刊：英文版 2005年第S1期15卷 172-175页

作者： LIU Guo-lin~(1. 2), zhang Lian-peng~2, OU Ji-kun~1.(1. Institute of {1. and Geophysics, chinese academy of Science, wuhan, 43.077,china 2. Shandong University of Science and Technology, Tai’an 271.1., china)

The time-dependence bilinear mixed-regression deformation model and time-dependence bilinear dynamic system deformation model are established for deformation observation series. According to the multi- level recursive method, the time-dependence parameters are first traced and predicted, and then the dynamic system states. Due to the method considering time-dependence of deformation and having stronger adaptability to time-dependence system, it can improve forecast’s precision. It is very effective for data processing of nonlinear dynamic deformation monitoring to make multi-step forecasting.

关键词： multi-level recursive dynamic monitoring timedependence parameters

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西北太平洋中国沿海海面倾斜及其机理初探

海洋学报 2002年第5期24卷 19-25页

作者：张赤军中国科学院测量与地球物理研究所湖北武汉430077

海面倾斜与高程基准密切相关 ,它已经受到大地测量学界和海洋学界的重视 .进一步讨论了大地水准的测量精度 ,指出了大地 (几何 )水准与沿海验潮资料的不符是由于海面的倾斜 ;分析了海面倾斜的机理 ,其中包括海流、海水密度分布、气压、... 详细信息

海面倾斜与高程基准密切相关 ,它已经受到大地测量学界和海洋学界的重视 .进一步讨论了大地水准的测量精度 ,指出了大地 (几何 )水准与沿海验潮资料的不符是由于海面的倾斜 ;分析了海面倾斜的机理 ,其中包括海流、海水密度分布、气压、台风引起的破碎波等的作用 ;提出了用海水异常密度的三维分布计算大地水准面的扰动 ,实质上它反映了海面的倾斜 ,该量占大地水准测量结果的 73. 。

关键词：海面倾斜海流海水密度大地水准面大地测量气压台风破碎波