GNSS垂向位移反演中国大陆地区陆地水储量变化

Inversion of terrestrial water storage changes in Chinese Mainland using GNSS vertical displacement

为了研究中国大陆地区的陆地水储量变化,利用陆态网182个GNSS站点垂向坐标时间序列反演了中国大陆地区2011-2021年的陆地水储量变化,并结合GRACE时变重力场数据、GLDAS水文模型和GPM降雨数据对中国大陆地区不同流域的陆地水储量反演结果进行对比分析。结果表明:(1)中国西南地区陆地水储量变化振幅最为显著,华南地区次之,西北内陆地区最不明显;(2)GNSS的结果与GRACE和GLDAS总体上具有较高的一致性,但在不同地区存在差异。其中,华南地区多种数据集一致性较高,华北地区则相对差异较大,可能是受该地区地下水减少的影响。结果表明GNSS可以作为监测区域陆地水储量变化的有效手段。

In order to study the changes of terrestrial water storage in Chinese Mainland,we used the vertical coordinate time series of 182 global navigation satellite system(GNSS)stations in the crustal movement observation network of China(CMONOC)to invert the terrestrial water storage changes in Chinese Mainland from 2011 to 2021.The regional water reserve inversion results of different basins in Chinese Mainland were compared and analyzed using gravity recovery and climate experiment(GRACE)time-varying gravity field data,global land data assimilation system(GLDAS)hydrological model and global precipitation measurement mission(GPM)rainfall data.The results show that:(1)The amplitude of terrestrial water storage changes in southwest China is the most significant,followed by South China,and the northwest inland area is the least significant;(2)The results of GNSS are generally consistent with GRACE and GLDAS,but there are differences in different regions.Among them,the consistency of multiple data sets in South China is relatively high,while that in North China is relatively large,which may be affected by the reduction of groundwater in the region.It shows that GNSS can be used as an effective tool to monitor the changes of regional terrestrial water storage.