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- 2018
联合GPS和GRACE研究青藏高原南部地区垂直形变的季节性波动
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Abstract:
利用青藏高原南部地区GPS站点近10 a（2004年至2014年）的观测资料，结合重力场恢复与气候实验卫星（Gravity Recovery and Climate Experiment，GRACE）同时期观测数据反演得到的该区域水文负荷变化引起的垂向位移，发现该地区利用GPS和GRACE获取的垂向位移时间序列存在一定相关性，多数站点的相关系数在0.7左右，特别是沿喜马拉雅造山带区域内的站点相关性更高；此外，大部分站点（例如CHLM、KKN4）拟合的周期项振幅和相位也较为一致。计算GRACE估算垂直信号改正GPS结果前后的加权均方根误差（weighted root mean square，WRMS），并定义RWRMS来表征GRACE改正GPS垂向季节性波动的有效性，其数值越接近1表明GPS和GRACE数据具有越大的一致性。研究发现GPS站点的RWRMS有明显差异：最大和最小值分别是0.96（TPLJ）和0.24（XZGE），平均值为0.64，这与青藏高原南部地区垂直运动的复杂性有关，存在多种因素（构造运动、冰川均衡调整、大气和非潮汐海洋负荷，水文负荷、GPS交点年误差等）的共同作用
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