联合GNSS和GRACE数据分析南极跟踪站的径向形变

VERTICAL DEFORMATION ANALYSIS OF ANTARCTIC GNSS STATIONS COMBINED USING GNSS AND GRACE DATA

利用南极大陆12个累积观测数据超过3年的GNSS跟踪站的监测序列,比较分析了其径向的形变趋势与GIA(Glacial Isostatic Adjustment)模型预测形变,并且与GRACE(Gravity Recovery and Climate Experiment)估计的径向位移结果进行相关性分析。GNSS结果显示跟踪站的径向形变多呈现上升趋势,少量出现下降的跟踪站多分布在东南极沿海区域,下降速度较小。与GRACE计算结果相比,两者的相关系数在0.241—0.663之间,表明两种观测手段得到的结果总体呈现较强的相关性。GNSS形变趋势与最新的GIA模型(W12a)预测形变趋势有一定的偏差,但总体吻合。

The GNSS monitoring time series of 12 GNSS stations in Antarctica,each of which spans at least 3 years,are analyzed to calculate their vertical deformations and the results are compared with those predicted by GIA（Glacial Isostatic Adjustment）.We also computed the correlations betwand GIA predicted trends,they show overall agreement with each other.een GNSS and GRACE（Gravity Recovery and Climate Experiment） data.The results derived from GNSS data show that the vertical deformations of most stations are on the rise,and the stations with slowly descending rates are located along the coast of East Antarctica.The vertical deformations derived from GNSS and GRACE data are significantly correlated with the correlation coefficients from 0.241 to 0.663.Although biases exist in the GNSS estimated deformation and GIA predicted trends, they show overall agreement with each other.