联合重力卫星数据及气候水文模型监测西南地区陆地水储量变化

Terrestrial water storage variations in Southwest China revealed by gravity mission and hydrologic and climate model

利用GRACE重力卫星观测数据和GLDAS水文模型资料反演我国西南地区陆地水储量变化,并结合该区域月平均降水资料进行分析。结果表明,GRACE重力卫星观测数据和GLDAS水文模型资料反演的西南地区陆地水储量变化相关系数为0.95,平均偏差为0.58 cm,具有良好的相关性;陆地水储量变化呈总体逐渐增加的趋势,受降雨量变化影响明显,且在时间上相对降雨量变化具有延迟性,与降水量变化的总体趋势一致,并具有显著的季节性变化特性,尤其是周年变化明显。

The terrestrial water storage variations in Southwest China were estimated by the GRACE（ gravity recovery and climate experiment） mission and GLDAS（ global land data assimilation system） model,and the data of monthly average precipitation in this area were analyzed. It can be seen that there is a good agreement between the terrestrial water storage variations derived from GRACE and GLDAS,with a correlation coefficient of 0. 95 and mean deviation of 0. 58 cm. The terrestrial water storage has a gradually increasing trend on the whole,and it is greatly affected by the variations of precipitation,but it always changes later than precipitation. The variations of the terrestrial water storage are consistent with those of the precipitation. In addition,with obvious yearly cycles,the terrestrial water storage variations in this area exhibit significant seasonal variations.