Intensive rainfall recharges tropical groundwaters
Intensive rainfall recharges tropical groundwaters
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DOI：
10.1088/1748-9326/10/12/124015
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发表时间：
2015-12
影响因子：
6.7
通讯作者：
S. Jasechko;R. Taylor
中科院分区：
文献类型：
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作者：
S. Jasechko;R. Taylor
在热带地区，对地下水的依赖预计将大幅度增加，到2050年，全世界人口的一半以上预计将在热带地区居住。充值是由于超过阈值的大降雨而发生的不成比例。通过将热带降水（15个地点）中O和H的稳定相异位比率与当地地下水的可用长期记录联系起来，我们揭示了热带地区的地下水充电几乎是均匀的（14/15个地点）每月降雨，通常超过70次强度，我们的结果表明，全球变暖带来的降水强度有利于热带的地下水。将密集的降雨传输到地下水系统，并增强温暖世界中热带地下水储存的弹性，尚不清楚。
Dependence upon groundwater to meet rising agricultural and domestic water needs is expected to increase substantially across the tropics where, by 2050, over half of the world’s population is projected to live. Rare, long-term groundwater-level records in the tropics indicate that groundwater recharge occurs disproportionately from heavy rainfalls exceeding a threshold. The ubiquity of this bias in tropical groundwater recharge to intensive precipitation is, however, unknown. By relating available long-term records of stable-isotope ratios of O and H in tropical precipitation (15 sites) to those of local groundwater, we reveal that groundwater recharge in the tropics is near-uniformly (14/15 sites) biased to intensive monthly rainfall, commonly exceeding the ∼70th intensity decile. Our results suggest that the intensification of precipitation brought about by global warming favours groundwater replenishment in the tropics. Nevertheless, the processes that transmit intensive rainfall to groundwater systems and enhance the resilience of tropical groundwater storage in a warming world, remain unclear.