Glacierized headwater streams as aquifer recharge corridors, subarctic Alaska
Glacierized headwater streams as aquifer recharge corridors, subarctic Alaska
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冰川源头溪流作为含水层补给走廊，亚北极阿拉斯加
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
T. Douglas
中科院分区：
文献类型：
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作者：
A. Liljedahl;A. Gädeke;S. O’Neel;T. Gatesman;T. Douglas
近几十年来，北极河流的排放量有所增加，但来源和机制仍有争议。大量的文献记录了过去几十年来冻土融化和山地冰川萎缩。在这里，我们链接冰川径流含水层补给，通过在亚北极内陆阿拉斯加失去源头流。在贾维斯溪（634平方公里），塔纳纳河和育空地区河流的一个子流域的实地测量显示，冰川融水径流作为一个大的组成部分（15-28%），总的年径流量，尽管低冰川覆盖（3%）。每年约有一半的水源流量流入含水层（38%至56%）。冰川含水层补给的估计长期变化超过了塔纳纳河基流的观测增加。我们的研究结果表明，冰川损耗，含水层补给沿着沿河源流走廊，和低地冬季排放之间的联系。因此，在半干旱气候条件下，冰川化的源头河床可能是主要的含水层补给区，因此有助于低地河流的全年基流。
Arctic river discharge has increased in recent decades although sources and mechanisms remain debated. Abundant literature documents permafrost thaw and mountain glacier shrinkage over the past decades. Here we link glacier runoff to aquifer recharge via a losing headwater stream in subarctic Interior Alaska. Field measurements in Jarvis Creek (634 km2), a subbasin of the Tanana and Yukon Rivers, show glacier meltwater runoff as a large component (15–28%) of total annual streamflow despite low glacier cover (3%). About half of annual headwater streamflow is lost to the aquifer (38 to 56%). The estimated long‐term change in glacier‐derived aquifer recharge exceeds the observed increase in Tanana River base flow. Our findings suggest a linkage between glacier wastage, aquifer recharge along the headwater stream corridor, and lowland winter discharge. Accordingly, glacierized headwater streambeds may serve as major aquifer recharge zones in semiarid climates and therefore contributing to year‐round base flow of lowland rivers.