Trends in Global Freshwater Availability from the Gravity Recovery and Climate Experiment (GRACE)

The Trends in Global Freshwater Availability from the Gravity Recovery and Climate Experiment (GRACE), 2002-2016, is a global gridded data set at a spatial resolution of 0.5 degrees that presents trends (rate of change measured in centimeters per year) in freshwater availability based on data obtained from 2002 to 2016 by NASA GRACE. Terrestrial water availability storage is the sum of groundwater, soil moisture, snow and ice, surface waters, and wet biomass, expressed as an equivalent height of water. GRACE measures changes in the terrestrial water cycle by assessing small changes in Earth's gravity field. This observation-based assessment of how the world's water cycle is responding to human impacts and climate variations provides an important tool for evaluating and predicting emerging threats to water and food security.

《全球淡水可用性趋势：基于重力恢复和气候实验（GRACE）2002-2016年的数据集》是一项全球格网数据集，其空间分辨率为0.5度，展示了基于2002年至2016年美国宇航局GRACE获取数据的淡水可用性趋势（以每年厘米为单位的变化率）。陆地水可用性储存是地下水资源、土壤水分、冰雪、地表水和湿地生物质的总和，并以等效水位高度表示。GRACE通过评估地球重力场的小幅变化来测量陆地水循环的变化。该基于观测的评估，探讨了世界水循环如何响应人类影响和气候变化，为评估和预测对水资源和粮食安全构成的新兴威胁提供了重要工具。