基于GRACE RL06数据探测三江源地区陆地水储量变化

Terrestrial Water Storage Changes in Three-River Source Region as Detected Based on GRACE RL06 Data

利用CSR最新发布的GRACE RL06数据反演2006~2015年三江源地区陆地水储量的时空变化,并结合GLDAS水文模型、TRMM降水数据及地表冻融数据进行对比分析。结果表明,三江源地区的陆地水和地表水在2006~2015年的变化趋势分别为5.2±1.2 mm/a和-3.8±0.9 mm/a;降水与陆地水的变化密切相关,也是造成陆地水储量呈季节性变化的主要原因;冻土作为特殊的蓄水层,影响着三江源地区地表水与地下水之间的水力联系,冻土活动可能造成GRACE与GLDAS水储量之间的差异;根据GRACE与GLDAS水储量在空间趋势上的差异推测,三江源地区高原多年冻土退化,活动层增厚。

In this paper,we inverse the spatial and temporal terrestrial water storage changes(TWSC)in the Three-River Source(TRS)region from 2006 to 2015 using the latest CSR data of GRACE RL06.The TWSC results obtained by RL06 are compared and analyzed with GLDAS hydrological model and TRMM precipitation data.The results show that the variation trends of terrestrial water and surface water in Three-River Source region between 2006 and 2015 are 5.2±1.2 mm/a and-3.8±0.9 mm/a respectively.Precipitation is closely related to the change of terrestrial water and is the main reason for the seasonal terrestrial water storage changes;permafrost,as a special aquifer,affects the hydraulic relationship between surface water and underground water.Combined with the surface freeze-thaw data,it is speculated that the permafrost activity causes the difference in the water storage of GRACE and GLDAS.