基于GAMIT/GLOBK和GPS观测确定加拿大地区的冰川均衡调整导致的垂向形变  

Vertical deformation caused by glacial isostatic adjustment in Canada based on GAMIT/GLOBK and GPS measurements

作　　者：张翰伟 陈巍[1] 李建成[1] ZHANG Hanwei;CHEN Wei;LI Jiancheng(School ol Geodsy and Geomatics,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079

出　　处：《测绘通报》2021年第5期38-42,共5页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(41874025,41474022);中央高校基本科研业务费(2042016kf0146)。

摘　　要：本文采用加拿大地区31个IGS台站的观测数据,利用GAMIT/GLOBK软件处理了时间跨度为2000—2018年的GPS原始观测资料,得到了ITRF2014参考框架下的台站位置垂向运动速率的时间序列。对GPS时间序列进行阶跃探测及修复、异常值探测及剔除、趋势项估计、去除近期冰川融化导致的地表弹性变形后,得到了由冰川均衡调整(GIA)导致的GPS台站抬升速率。本文的结果与前人基于GPS观测得到的结果(在ITRF2008框架下)相差在2 mm/a以内,与ICE6G系列GIA模型预测值相差在3 mm/a以内,因此验证了本文结果的正确性和可靠性,为进一步利用全球GPS台站观测数据研究GIA垂直形变速率,进而约束和改进GIA模型打下了坚实基础。Based on the GAMIT/GLOBK software, this paper processes the original GPS observation data, with a time span of 2000—2018, from 31 IGS stations in Canada, and obtains the time series of the station vertical velocities under the ITRF2014 reference frame. With jumps corrected and outliers eliminated, this paper removes contributions from elastic deformations caused by the recent melting of glaciers, and estimates the uplift rate of GPS stations caused by glacial isostatic adjustment(GIA) from the GPS time series. The differences between the results and the previous results are within 2 mm/a, and the difference between the results and the predicted value of the ICE6 G series GIA model is within 3 mm/a, which verify the correctness and reliability of the results. This study has laid a solid foundation for constraining and improving the GIA model by using observation data from global GPS stations.

关 键 词：冰川均衡调整 地表垂直形变 GAMIT/GLOBK GPS时间序列 

分 类 号：P228[天文地球—大地测量学与测量工程]