Have GRACE satellites overestimated groundwater depletion in the Northwest India Aquifer?
Have GRACE satellites overestimated groundwater depletion in the Northwest India Aquifer?
复制标题
GRACE 卫星是否高估了印度西北部含水层的地下水枯竭程度？
DOI：
10.1038/srep24398
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发表时间：
2016-04-14
影响因子：
4.6
通讯作者：
Yang W
中科院分区：
文献类型：
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作者：
Long D;Chen X;Scanlon BR;Wada Y;Hong Y;Singh VP;Chen Y;Wang C;Han Z;Yang W
印度西北部含水层（NWIA）已被证明具有全球最高的地下水枯竭率（GWD），威胁着作物生产和地下水资源的可持续性。重力恢复和气候实验卫星已成为利用辅助数据评估全球变暖的有力工具。然而，由于GRACE数据处理的不确定性，精确的GWD估计是具有挑战性的。我们使用多种方法评估了西北工业区的GWD速率，包括新开发的约束正演模型，得出2005年1月至2010年12月的GWD速率为3.1 ± 0.1 cm/a（或14 ± 0.4 km 3/a），与地下水位监测数据的GWD速率（2.8 cm/a或12.3 km 3/a）一致。已发表的研究（例如，4 ± 1cm/a或18 ± 4.4km ~ 3/a）可能高估了该区的GWD。这项研究强调了GWD估计的不确定性，以及将先验信息用于改进GRACE信号空间模式的重要性，这些空间模式在地下水资源管理中可能更有用，需要在未来的研究中更加关注。
The Northwest India Aquifer (NWIA) has been shown to have the highest groundwater depletion (GWD) rate globally, threatening crop production and sustainability of groundwater resources. Gravity Recovery and Climate Experiment (GRACE) satellites have been emerging as a powerful tool to evaluate GWD with ancillary data. Accurate GWD estimation is, however, challenging because of uncertainties in GRACE data processing. We evaluated GWD rates over the NWIA using a variety of approaches, including newly developed constrained forward modeling resulting in a GWD rate of 3.1 ± 0.1 cm/a (or 14 ± 0.4 km3/a) for Jan 2005–Dec 2010, consistent with the GWD rate (2.8 cm/a or 12.3 km3/a) from groundwater-level monitoring data. Published studies (e.g., 4 ± 1 cm/a or 18 ± 4.4 km3/a) may overestimate GWD over this region. This study highlights uncertainties in GWD estimates and the importance of incorporating a priori information to refine spatial patterns of GRACE signals that could be more useful in groundwater resource management and need to be paid more attention in future studies.