基于Cryosat-2与船载重力测量数据反演我国近海海域重力异常  

Method of Construction Gravity Anomaly in Coastal Region of China Using Cryosat-2 Altimetric and Shipborne Data

作　　者：柯宝贵[1] 张利明[1] 王伟[1] 许军[2] 章传银[1] 党亚民[1] KE Baogui ZHANG Liming WANG Wei XU Jun ZHANG Chuanyin DANG Yamin(Chinese Academy of Surveying and Mapping, Beijing 100830, China Department of Hydrography and Cartography, Dalian Naval Academy, Delian 116018, China)

机构地区：[1]中国测绘科学研究院,北京100830 [2]海军大连舰艇学院海洋测绘系,辽宁大连116018

出　　处：《同济大学学报（自然科学版）》2017年第10期1531-1538,共8页Journal of Tongji University:Natural Science

基　　金：国家重点研发计划(2016YFB0501702);国家"九七三"重点基础研究发展计划(2013CB733302);科技基础性工作专项(2015FY310200);国家自然科学基金(41404034;41374081;41004004;41304009;41574004);德意志学术交流中心(DAAD)现代大地测量空间技术全球变化监测项目(57173947)

摘　　要：基于Cryosat-2三年半的卫星测高GDR(geophysical data records)数据,使用海面高梯度,依据最小二乘配置方法得到了南海部分海域垂线偏差格网,结合移去-恢复技术采用逆Vening-Meinesz的球面一维傅里叶变换算法快速计算我国近海海域测高重力异常CASM_GRA.与船载重力测量数据融合后,重力场精度在2.75~5.38mgal之间,平均偏差在-0.21~0.45mgal之间.与DTU13重力场模型相比,平均值最大改进为12.98mgal,标准差最大降幅近3.40mgal.与Sandwell V23.1模型相比,平均值最大改进为13.58 mgal,标准差最大降幅为1.09mgal.Based on three and a half years of satellite altimetric GDR data of cryosat-2, the deflection of the vertical grid were obtained by using sea surface height gradient data and the least square collocation method in coastal region of China. The inverse Vening Meinesz formula and the remove- restore technique were adopted to get sea gravity anomaly in the interested region. After fusion with the shipborne gravity data, the precision of the constructed gravity anomaly was found to be from 2.75 mgal to 5.38 mgal and the mean value was from -0.21 regal to 0.45 mgal. Compared with DTU13 gravity field model, the maximum mean value improvement was 12.98 mgal and standard deviation improvement was 3.4 mgal. Compared with the Sandwell V23.1 gravity field model, the maximum mean value improvement was 13.58 mgal and standard deviation improvement was 1.09 mgal.

关 键 词：Cryosat-2 重力异常 测高 船载重力测量 

分 类 号：P223[天文地球—大地测量学与测量工程]