Subregional-scale groundwater depletion detected by GRACE for both shallow and deep aquifers in North China Plain
Subregional-scale groundwater depletion detected by GRACE for both shallow and deep aquifers in North China Plain
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GRACE检测华北平原浅层和深层含水层次区域地下水枯竭
DOI：
10.1002/2014gl062498
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发表时间：
2015-03-28
影响因子：
5.2
通讯作者：
Zhao, Wenji
中科院分区：
文献类型：
--
作者：
Huang, Zhiyong;Pan, Yun;Zhao, Wenji
本研究探讨了重力恢复与气候实验（GRACE）对华北平原两个亚区--皮埃蒙特平原（PP，类似于54，000 km（2），主要开采浅层地下水）和中东部平原（ECP，类似于86，000 km（2），主要开采深层地下水）非均质地下水储量（GWS）变化的探测能力。结果表明，GRACE数据（2003-2013年）估算的全球变暖距平与现场观测（2005-2010年）估算的全球变暖距平（R-2=0.91）和全球变暖距平（R-2=0.75）吻合较好。PP浅层GWS（2003-2013）下降速度（-46.56.8mm/yr）快于ECP深层GWS（-16.91.9mm/yr）。然而，浅GWS在PP恢复更快，特别是在2008-2011年干旱期间。尽管其较低的幅度，GRACE派生的全球变暖枯竭在ECP揭示了过度开发的深层全球变暖。该研究表明，GRACE在小于典型GRACE足迹（200，000 km（2））的次区域尺度上可以潜在地检测到异质性GWS变化。
This study explores the capability of Gravity Recovery and Climate Experiment (GRACE) to detect heterogeneous groundwater storage (GWS) variations in two subregions of the North China Plain: the Piedmont Plain (PP, similar to 54,000km(2), mainly exploiting shallow groundwater) and East Central Plain (ECP, similar to 86,000km(2), mainly exploiting deep groundwater). Results show that the GWS anomalies estimated from GRACE data (2003-2013) agree well with those estimated from in situ observations (2005-2010) for both PP (R-2=0.91) and ECP (R-2=0.75). The shallow GWS (2003-2013) in PP declines faster (-46.56.8mm/yr) than the deep GWS in ECP (-16.91.9mm/yr). However, the shallow GWS in PP recovered more quickly especially during the 2008-2011 drought period. Despite its lower magnitude, the GRACE-derived GWS depletion in ECP reveals the overexploitation of deep GWS. This study demonstrated that the heterogeneous GWS variations can potentially be detected by GRACE at the subregional scale smaller than the typical GRACE footprint (200,000km(2)).