重力卫星检测到的全球陆地水储量变化

THE SUBTERRANEAN WATER TIME VARIATION IN GLOBAL AREA BY GRACE MISSION

利用GRACE时变重力位模型反演了2004年至2008年共60个月的全球陆地水存储量变化,并采用滑动年平均,对全球陆地水储量的长期性变化情况进行了分析,同时也推求了全球陆地水储量的季节性变化。研究表明,使用滑动年平均对GRACE重力位模型数据进行处理,可以较好地揭示全球陆地水储量的长期和季节性变化情况,其监测能力足以揭示几cm的等效水高变化。

Based on the global gravity results by GRACE mission,we estimate the 60 months’ global subterranean water variation from 2004. We use annually smoothing method to calculate the subterranean water variation in global area,and obtaine its longterm and seasonal variations. The result shows that annually smoothing method is an effective way to analyze the variation of subterranean water. The GRACE observation can clearly open out the subterranean water variation even in a relatively small area and find an equivalent water reduce of several cm in thickness in continental area.