Terrestrial water storage (TWS) variation is crucial for global hydrological cycles and water resources management under climatic changes. In the previous studies, changes in water storage of some part of China have been studied with GRACE data in recent ten years. However, the spatial pattern of changes in water storage over China may be different in a long period. Here, we aimed to present long-term spatial patterns of TWS over China between 1948 to 2015 by unique Global Land Data Assimilation System Version 2 data and identify possible factors to water storage changes. The results revealed that the inner-annual variations in TWS of China exhibited remarkable downward trends with decreased rate of 0.1 cm/yr. Meanwhile, we found that spatial patterns of TWS in China can be divided into three distinct sub-regions of TWS region with increased, TWS region with decreased, TWS region with insignificant variation. The Northeast had decreased trends (−0.05 cm/yr) due to climate change and anthropogenic activities. Urban expansion is a non-ignorable factor to TWS reduction in Jing-Jin-Ji region (r = 0.61); the west had increased from 1948 to 2015 (0.03 cm/yr) due to precipitation increased and recharge by glacier me the south had insignificant trends and TWS varied with precipitation (r = 0.78).
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机译：陆地储水量（TWS）的变化对于气候变化下的全球水文循环和水资源管理至关重要。在先前的研究中，最近十年来利用GRACE数据研究了中国部分地区的储水量变化。但是，长期来看，中国储水量变化的空间格局可能会有所不同。在这里，我们旨在通过独特的全球土地数据同化系统第2版数据，介绍1948年至2015年期间中国TWS的长期空间格局，并确定可能导致储水量变化的因素。结果表明，中国TWS的年内变化呈现出明显的下降趋势，下降速度为0.1 cm / yr。同时，我们发现中国TWS的空间格局可以分为TWS区域增加，TWS减少，TWS变化不明显的三个不同的子区域。由于气候变化和人为活动，东北地区的趋势有所减少（-0.05 cm / yr）。在京津冀地区，城市扩张是减少总排放量的不可忽视的因素（r = 0.61）；由于降水增加和冰川融化补给，西部从1948年到2015年增加了（0.03（cm / yr）。南部的趋势不明显，而TWS随降水变化（r = 0.78）。
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