GRACE measurements of mass variability in the Earth system
GRACE measurements of mass variability in the Earth system
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DOI：
10.1126/science.1099192
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发表时间：
2004-07-23
期刊：
影响因子：
56.9
通讯作者：
Watkins, MM
中科院分区：
文献类型：
--
作者：
Tapley, BD;Bettadpur, S;Watkins, MM
由两颗重力恢复和气候实验(GRACE)卫星做出的每月重力场估计，在空间分辨率低至400公里的情况下，大地水准面高度精度为2至3毫米。大地水准面变化的年周期在一些地区高达10毫米，主要在春季和秋季达到顶峰。在南美洲观察到的大地水准面变化在很大程度上可归因于地表水和地下水的变化，表明亚马逊大分水岭与北部较小的分水岭之间存在明显的分离。这种观测将有助于水文学家将传统长度尺度(几十公里或更短)的过程与区域和全球尺度的过程联系起来。
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.