GRACE measurements of mass variability in the Earth system

被引:1927
作者
Tapley, BD
Bettadpur, S
Ries, JC [1 ]
Thompson, PF
Watkins, MM
机构
[1] Univ Texas, Ctr Space Res, Austin, TX 78712 USA
[2] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA
关键词
D O I
10.1126/science.1099192
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Monthly gravity field estimates made by the twin Gravity Recovery and Climate Experiment (GRACE) satellites have a geoid height accuracy of 2 to 3 millimeters at a spatial resolution as small as 400 kilometers. The annual cycle in the geoid variations, up to 10 millimeters in some regions, peaked predominantly in the spring and fall seasons. Geoid variations observed over South America that can be largely attributed to surface water and groundwater changes show a clear separation between the large Amazon watershed and the smaller watersheds to the north. Such observations will help hydrologists to connect processes at traditional length scales ( tens of kilometers or less) to those at regional and global scales.
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页码:503 / 505
页数:3
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