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Trend of China land water storage redistribution at medi- and large-spatial scales in recent five years by satellite gravity observations

机译：卫星重力观测近五年来中国中，大型空间陆地储水再分配趋势

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摘要

The GRACE (Gravity Recovery and Climate Experiment) satellite gravity mission has provided a new method to study land water mass redistribution at medi- and long-spatial scales in recent years. We estimate continental water mass redistribution in China using GRACE observations during 2003 to 2007. The results show some large regions with increase or decrease of land water mass storage in the central northern region, Tibetan Plateau, the Three Gorges region, the place where Qinghai, Sichuan and Gansu provinces meet, and the Altun Mountains region in the Xinjiang Uygur Autonomous Region. In the first two regions, it is obvious that water (ice) mass storages are decreasing. Water mass in the central northern region decreases at a linear rate of 2.4 cm/a equivalent water height, equal to 5.2 billion cubic meters per year during the five years' period, and water mass depletion in Hebei Province is similar to 4.5 billion cubic meters per year in the same period, which is consistent with the average water mass depletion of 4.0 billion cubic meters per year of overused underground water in the recent 30 years estimated by Hebei Province Water Resources Bureau. Furthermore, GRACE can detect the water mass accumulation of similar to 5 cm equivalent water height within the region spreading over about 0.12 million square kilometers due to the Three Gorges dam construction in June 2003. We also find a water mass gain of similar to 1.1 cm/a in the areas where Qinghai, Sichuan and Gansu provinces meet. This indicates that the climate of these regions has been becoming gradually humid in recent years.
机译：近年来，GRACE（重力恢复和气候实验）卫星重力任务提供了一种新的方法来研究中长期尺度上的土地水量再分配。我们使用GRACE观测值估算了2003年至2007年中国大陆水量的重新分布。结果显示，中部北部地区，青藏高原，三峡地区，青海，四川省和甘肃省以及新疆维吾尔自治区的阿尔通山脉地区相遇。在前两个区域中，很明显，水（冰）的大量存储量正在减少。北部中部地区的水量以2.4厘米/当量水高的线性速度减少，五年期间每年等于52亿立方米，而河北省的水耗则接近45亿立方米据河北省水利厅估算，最近30年中，每年平均过量浪费地下水​​40亿立方米，这与同期平均每年的水耗相同。此外，由于2003年6月的三峡大坝建设，GRACE可以探测到该区域内分布在约12万平方公里的水面高度相当于5厘米水柱的水团聚积。我们还发现了约1.1厘米水柱的积水。 / a在青海，四川和甘肃省交汇的地区。这表明近年来这些地区的气候已逐渐变得潮湿。

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