南极布兰斯菲尔德海峡船测重力资料平差处理  

The Adjustment of Shipborne Gravimetric Data for the Bransfield Strait

作　　者：马龙[1] 郑彦鹏[1,2] 裴彦良[1,2] 赵强[1,2] 刘晨光[1,2] 高金耀[3] 李祖辉[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061 [2]国家海洋局海洋沉积与环境地质重点实验室,山东青岛266061 [3]国家海洋局第二海洋研究所,浙江杭州310012

出　　处：《海洋科学进展》2015年第3期403-413,共11页Advances in Marine Science

基　　金：南北极环境综合考察与评估专项--南极周边海域海洋地球物理考察(CHINARE2014-01-03);南极周边海域地质环境分析与评价(CHINARE2015-04-01)和南极周边海域与大陆资源潜力综合评估(CHINARE2015-04-02)

摘　　要：基于中国南极考察第28航次和第30航次所获得的实测重力数据,结合NGDC的部分资料,我们采用最小二乘算法平差处理布兰斯菲尔德海峡内470 610个有效船测重力观测值点,使航次内、航次间观测误差达到极小。针对不同航次、不同船只数据交点的分布情况,对平差方式进行不同程度的微调,完成对研究区4组数据的平差。其中,中国南极考察第28航次船测数据交点误差的标准差由平差前的5.5×10-5 m/s2降为平差后的1.78×10-5m/s2,而全部125个交点平差后标准差降为1.545×10-5 m/s2。在此基础上,绘制了研究区空间重力异常图,相比卫星重力异常数据,融合成果数据能更真实地反映海底火山等特征,从而进一步提高了数据精度。Based on the measured data in the 28 th and 30 th Chinese National Antarctic Research Expedition,combined with the reference data,this study adopted the least-square adjustment method to process470 610 effective shipborne gravimetric data points in Bransfield,and minimized the observation error in one cruise and among different cruises.Adjustment method was changed with different degrees according to the crossover distribution among different cruises and vessels,to adjust 4groups of data in study area.After adjustment,the standard deviation of differences among the crossovers in the cruise No.CHN28 was reduced from 5.5×10^-5 m/s^2 to 1.78×10^-5 m/s^2,while in all 125 crossovers among these cruises the standard deviation of differences reached 1.545×10^-5 m/s^2.On this basis,this study drew the free-air anomaly map of study area,and concluded that the fusion of ship-derived data could reflect the bottom of the sea with higher accuracy than those of satellite-derived data.

关 键 词：最小二乘法 数据平差 重力异常 

分 类 号：P738[天文地球—海洋地质]