gPhone重力仪与GRACE观测的陆地水季节性重力变化对比  

A comparision of seasonal gravity variation caused by terrestrial water from gPhone gravimeter and GRACE

作　　者：贾路路[1,2] 王新胜[1,2] 韩宇飞 李强 

机构地区：[1]地壳运动监测工程研究中心,中国北京100036 [2]中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,中国武汉430077

出　　处：《地震地磁观测与研究》2014年第3期153-158,共6页Seismological and Geomagnetic Observation and Research

基　　金：国家自然科学基金(41204013;41304057);地壳工程中心主任基金(2013);大地测量与地球动力学国家重点实验室开放基金(SKLGED2013-2-4-E)联合资助

摘　　要：利用中国大陆构造环境监测网络中张家口、淮北、溧阳重力台的gPhone连续重力观测数据,经过Tsoft软件数据预处理、固体潮、海潮负荷、极移等主要潮汐信号的扣除、局部气压改正,以及分段拟合仪器漂移后,得到观测数据的非潮汐信号,该信号时间序列呈现明显的季节性,主要反映陆地水储量变化;在此基础上,将地面重力非潮汐信号的月均值与重力卫星GRACE的观测结果进行比较。结果发现,仪器观测较稳定的张家口站和淮北站,地面重力和卫星重力观测的季节性信号具有一定的一致性;而溧阳站两种观测的相关性较差,可能与仪器观测的稳定性及台站周边区域环境因素有关。The amplitude of regional gravity variation caused by terrestrial water can reach several or even a dozen microgal,which can be monitored by ground-based gravity and by satellite gravity.We select three continuous observation stations using gPhone from the Crustal Movement Observation Network of China and use Tsoft to do original dataset preprocessing. We have removed the gravity effects of major tides：solid earth tide,ocean loading and polar tide,corrected for atmospheric loading effects using local measurements,fitted instrumental drift using segmental fitting.Then we extract non-tidal changes of gravity,which show obvious seasonal changes,mainly reflecting terrestrial water storage changes.Following that we compare the non-tidal signals from monthly mean value of ground-based gravity and GRACE.It is found that,for more stable stations Zhangjiakou and Huaibei,the correlation of ground-based gravity and GRACE are obvious.However,the correlation of the two observations is not clear on Liyang station.This may be associated with the instrumental stability and the regional environmental factors around Liyang station.

关 键 词：地面重力 季节性信号 陆地水 

分 类 号：P312[天文地球—固体地球物理学]