非构造形变对中国大陆GNSS基准站垂向周期运动的影响

解算陆态网络2011~2013年GNSS基准站,获取其坐标时间序列,并定量计算非潮汐海洋、大气、积雪和土壤湿度对测站产生的非构造形变,以修正GNSS垂向时间序列。修正后,GNSS垂向序列特性发生显著变化:周年运动振幅和初相均发生明显变化,振幅明显缩小(个别站增大),缩小幅度因不同区域而存在差异;修正前相位与修正后存在一定的系统偏差,大约滞后2~3个月,这种系统偏差可能是GNSS测站对地球物理因素"迟钝反应"的综合表现;半周年运动的变化主要体现在振幅上,缩小幅度在1mm左右。

Effects of Non-Tectonic Deformation on the Vertical Periodic Motion of GNSS Reference Stations in China

We get the coordinate time series by solving CMONOC GNSS reference stations during 2011-2013 and calculate the non-tectonic deformation on sites produced by non-tidal ocean, atmospheric conditions, snow, and soil moisture. The GNSS vertical series has significant changes corrected by non-tectonic deformation: the amplitude and initial phase of annual motion present significant changes, and the amplitude reduced (individual sites increasing) and the narrow margin varies in different regions. The initial phase has a systematic bias before and after correction, with about 2-3 months lag, such that the systematic biases may be the effect of the GNSS sites’ overall “slow response” to geophysical factors. The change of semi-annual motion reflects principally on the amplitude, with a narrow margin of about 1 mm.