检索结果-南通市图书馆

A High-Resolution Earth’s gravity field model SGG-UGM-2 from GOCE,GRACE,Satellite Altimetry,and EGM2008

Engineering 2020年第8期6卷 860-878页

作者： Wei Liang Jiancheng Li Xinyu Xu Shengjun Zhang Yongqi Zhao School of Geodesy and Geomatics Wuhan UniversityWuhan 430079China Key Laboratory of Geospace Environment and Geodesy Ministry of EducationWuhan UniversityWuhan 430079China School of Resources and Civil Engineering Northeastern UniversityShenyang 110004China

This paper focuses on estimating a new high-resolution Earth’s gravity field model named SGG-UGM-2 from satellite gravimetry,satellite altimetry,and Earth Gravitational model 2008(EGM2008)-derived gravity data based on the theory of the ellipsoidal harmonic analysis and coefficient transformation(EHA-CT).We first derive the related formulas of the EHA-CT method,which is used for computing the spherical harmonic coefficients from grid area-mean and point gravity anomalies on the *** derived formulas are successfully evaluated based on numerical ***,based on the derived least-squares formulas of the EHA-CT method,we develop the new model SGG-UGM-2 up to degree 2190 and order 2159 by combining the observations of the gravity field and Steady-State Ocean Circulation Explorer(GOCE),the normal equation of the gravity Recovery and Climate Experiment(GRACE),marine gravity data derived from satellite altimetry data,and EGM2008-derived continental gravity *** coefficients of degrees 251–2159 are estimated by solving the block-diagonal form normal equations of surface gravity anomalies(including the marine gravity data).The coefficients of degrees 2–250 are determined by combining the normal equations of satellite observations and surface gravity *** variance component estimation technique is used to estimate the relative weights of different ***,global positioning system(GPS)/leveling data in the mainland of China and the United States are used to validate SGG-UGM-2 together with other models,such as European improved gravity model of the earth by new techniques(EIGEN)-6C4,GECO,EGM2008,and SGG-UGM-1(the predecessor of SGG-UGM-2).Compared to other models,the model SGG-UGM-2 shows a promising performance in the GPS/leveling *** GOCE-related models have similar performances both in the mainland of China and the United States,and better performances than that of EGM2008 in the mainland of *** to the contribut

关键词： gravity field model GOCE GRACE Satellite altimetry Block-diagonal least-squares

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The construction of high precision geostrophic currents based on new gravity models of GOCE and satellite altimetry data

引用

Acta Oceanologica Sinica 2021年第3期40卷 142-152页

作者： Wenyan Sui Junru Guo Jun Song Zhiliang Liu Meng Wang Xibin Li Yanzhao Fu Yongquan Li Yu Cai Linhui Wang Lingli Li Xiaofang Guo Wenting Zuo School of Marine Science and Environment Engineering Dalian Ocean UniversityDalian 116023China Operational Oceanographic Institution Dalian Ocean UniversityDalian 116023China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Institute of Marine Science Hebei Normal University of Science and TechnologyQinhuangdao 066600China Tianjin Marine Environmental Monitoring Central Station Ministry of Natural ResourcesTianjin 300457China

The new gravity field models of gravity field and steady-state ocean circulation explorer(GOCE),TIM_R6 and DIR_R6,were released by the European Space Agency(ESA)in June *** sixth generation of gravity models have the highest possible signal and lowest error levels compared with other GOCE-only gravity models,and the accuracy is significantly *** is an opportunity to build high precision geostrophic *** mean dynamic topography and geostrophic currents have been calculated by the 5th(TIM_R5 and DIR_R5),6th(TIM_R6 and DIR_R6)release of GOCE gravity field models and ITSG-Grace2018 of GRACE gravity field model in this *** comparison with the drifter results,the optimal filtering lengths of them have been obtained(for DIR_R5,DIR_R6,TIM_R5 and TIM_R6 models are 1°and for ITSG-Grace2018 model is 1.1°).The filtered results show that the geostrophic currents obtained by the GOCE gravity field models can better reflect detailed characteristics of ocean *** total geostrophic speed based on the TIM_R6 model is similar to the result of the DIR_R6 model with standard deviation(STD)of 0.320 m/s and 0.321 m/s,*** STD of the total velocities are 0.333 m/s and 0.325 m/s for DIR_R5 and TIM_*** compared with ITSG-Grace2018 results,the STD(0.344 m/s)of total geostrophic speeds is larger than GOCE results,and the accuracy of geostrophic currents obtained by ITSG-Grace2018 is *** the absolute errors are mainly distributed in the areas with faster speeds,such as the Antarctic circumpolar circulation,equatorial region,Kuroshio and Gulf Stream *** the remove-restore technique was applied to TIM_R6 MDT,the STD of total geostrophic speeds dropped to 0.162 m/s.

关键词： GOCE gravity field model mean dynamic topography geostrophic current

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

GRACE-based estimates of water discharge over the Yellow River basin

引用

Geodesy and Geodynamics 2016年第3期7卷 187-193页

作者： Qiong Li Bo Zhong Zhicai Luo Chaolong Yao MOE Key Laboratory of Fundamental Physical Quantities Measurement School of Physics Huazhong University of Science and Technology School of Geodesy and Geomatics Wuhan University Key Laboratory of Geospace Environment and Geodesy Ministry of Education Wuhan University

As critical component of hydrologic cycle, basin discharge is a key issue for understanding the hydrological and climatologic related to water and energy cycles. Combining GRACE gravity field models with ET from GLDAS models and precipitation from GPCP, discharge of the Yellow River basin are estimated from the water balance equation. While comparing the results with discharge from GLDAS model and in situ measurements, the results reveal that discharge from Mosaic and CLM GLDAS model can partially represent the river discharge and the discharge estimation from water balance equation could reflect the discharge from precipitation over the Yellow River basin.

关键词： GRACE gravity field model Terrestrial water storage Water discharge Yellow River basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Recovery of the gravity field from GOCE data by using the invariants of gradient tensor

引用

Science China Earth Sciences 2013年第9期56卷 1193-1199页

作者： YU JinHai WAN XiaoYun Key Laboratory of Computational Geodynamics Chinese Academy of Sciences College of Earth Science Graduate University of Chinese Academy of Sciences

The gravity field models GUCAS_EGM and GUCAS_EGM_DL are established from GOCE data (GOCE Level 2 Products from Nov. 1 to Dec. 31, 2009) based on the method of the invariants of the gravity gradient tensor, where GUCAS_EGM is derived after GOCE gravity gradient data are filtered with FIR, and GUCAS_EGM_DL is computed with an additional Durbin-Levison arithmetic apart from FIR. Since this method, different from current programs dealing with GOCE data, is introduced for the first time, some new problems are required to be discussed in advance; for example, how to filter GOCE gravity gradient data, how to compute the invariants of the gradient tensor, and how to deal with the pole gap and so on. In addition, by comparing our models with ones recommended by ESA, it can be seen that the variations of GUCAS_EGM and the models recommended by ESA to EGM08 are almost equivalent, and the variation of GUCAS_EGM_DL to EGM08 is obviously less than ones of the recommended models.

关键词： GOCE invariants of gravity tensor gravity field model

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

gravity field recovery from GOCE orbits using the energy conservation approach

引用

Geodesy and Geodynamics 2013年第2期4卷 40-46页

作者： Su Yong Fan Dongming School of Geoscience and Environment Engineering Southwest Jiaotong University

The sum of the dissipative energy and energy constant of the GOCE satellite is found by a priori gravity field model at first, and the GOCE dissipative energy is obtained by computing the adjacent epoch difference via the differential method. Then, a gravity field model GOCE-ECPO1, which up to the degree and order 80, is recovered by the energy conservation approach from the 103-day precise orbital data of the GOCE satellite collected from November 1, 2009 to January 12, 2010. Finally, the model is compared with existing models EGM96, ITG-CHAMP05S, EIGEN-GRACE2010S, EIGEN-6C and GO CONS GCF 2 DIR_R3. The results show that at the same order and degree, the accuracy of model GOCE-EBPO1 is higher than those of models EGM96 and ITG-CHAMP05S, but lower than those of models EIGEN-GRACE2010S, EIGEN-6C and GO_CONS_GCF 2 DIR_R3, which is mainly caused by the pole gap.

关键词： energy conservation approach GOCE satellite gravity field model dissipative energy potential coefficient

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Construction of nonsingular formulae of variance and covariance function of disturbing gravity gradient tensors

引用

Geodesy and Geodynamics 2013年第4期4卷 1-8页

作者： Liu Xiaogang Zhang Yaofeng Li Yan Xu Kang Xi'an Research Institute of Surveying and Mapping State Key Laboratory of Geo-information Engineering Key Laboratory of Geo-space Environment and Geodesy of Ministry of Education Wuhan University School of Information Science and Engineering Lanzhou University The 61206 Troops of PLA The Fourth Surveying and Mapping and Navigation Base

When the computational point is approaching the poles, the variance and covariance formulae of the disturbing gravity gradient tensors tend to be infinite, and this is a singular problem. In order to solve the problem, the authors deduced the practical non-singular computational formulae of the first- and second-order derivatives of the Legendre functions and two kinds of spherical harmonic functions, and then constructed the nonsingular formulae of variance and eovarianee function of disturbing gravity gradient tensors.

关键词： nonsingular gravity field model satellite gravity gradient variance covariance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：