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

卫星严肃使命提供了的优雅(严肃恢复和气候实验) 学习土地的一个新方法在最近的年里在 medi 空间、长空间的规模浇集体再分配。我们在 2003 ～ 2007 期间用优雅观察在中国估计大陆人水团再分配。结果随增加显示出一些大区域或土地的减少在 Xinjiang Uygur 自治区域在中央北区域，西藏的高原，三个峡区域， Qinghai，四川和 Gansu 省相遇的地方，和 Altun 山区域浇集体存储。在开始的二个区域，水(冰) 集中，是明显的存储正在减少。在以 2.4 cm/a 等价物的线性率的中央北区域减少的水质量浇高度，在五年的时期期间每年等于到 52 亿立方的米，并且浇集体弄空在 Hebei 省是 ∼45 亿立方的米每滥用的地下的水的年每在一样的时期，它与一般水准一致的年浇 40 亿立方的米的集体弄空在最近 Hebei 省估计的 30 年浇资源局。而且，优雅能检测 ∼ 的水团累积在散布超过大约 12 万的区域以内的 5 厘米相等的水高度由于三峡摆平公里在 2003 年 6 月的水坝建设。我们也发现 ∼ 的水团获得在 Qinghai，四川和 Gansu 省相遇的区域的 1.1 cm/a。这显示这些区域的气候在最近的年里一直在变得逐渐地潮湿。

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 - 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 - 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 - 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.