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Discovery of a hypersaline subglacial lake complex beneath Devon Ice Cap, Canadian Arctic.
Science Advances ( IF 13.6 ) Pub Date : 2018-Apr-01 , DOI: 10.1126/sciadv.aar4353
Anja Rutishauser 1 , Donald D. Blankenship 2 , Martin Sharp 1 , Mark L. Skidmore 3 , Jamin S. Greenbaum 2 , Cyril Grima 2 , Dustin M. Schroeder 4, 5 , Julian A. Dowdeswell 6 , Duncan A. Young 2
Affiliation  

Subglacial lakes are unique environments that, despite the extreme dark and cold conditions, have been shown to host microbial life. Many subglacial lakes have been discovered beneath the ice sheets of Antarctica and Greenland, but no spatially isolated water body has been documented as hypersaline. We use radio-echo sounding measurements to identify two subglacial lakes situated in bedrock troughs near the ice divide of Devon Ice Cap, Canadian Arctic. Modeled basal ice temperatures in the lake area are no higher than -10.5°C, suggesting that these lakes consist of hypersaline water. This implication of hypersalinity is in agreement with the surrounding geology, which indicates that the subglacial lakes are situated within an evaporite-rich sediment unit containing a bedded salt sequence, which likely act as the solute source for the brine. Our results reveal the first evidence for subglacial lakes in the Canadian Arctic and the first hypersaline subglacial lakes reported to date. We conclude that these previously unknown hypersaline subglacial lakes may represent significant and largely isolated microbial habitats, and are compelling analogs for potential ice-covered brine lakes and lenses on planetary bodies across the solar system.

中文翻译:

在加拿大北极的德文郡冰帽下发现了一个高盐下冰河湖综合体。

冰河下湖泊是独特的环境,尽管极端黑暗和寒冷的条件下,已经证明它们具有微生物的生命。在南极洲和格陵兰岛的冰盖下发现了许多冰下湖,但没有记录到空间上孤立的水体为高盐度。我们使用无线电回波探测技术来确定位于加拿大北极圈德文郡冰帽冰区附近基岩槽中的两个冰河湖。湖泊地区基础冰的模拟温度不高于-10.5°C,这表明这些湖泊由高盐度水组成。高盐度的含义与周围的地质情况相吻合,这表明冰下湖位于富含蒸发盐的沉积物单元中,该沉积物单元包含层状盐序列,这很可能是盐水的溶质源。我们的结果揭示了加拿大北极地区冰下湖泊的第一个证据,以及迄今为止报道的第一个高盐度冰下湖泊。我们得出的结论是,这些先前未知的高盐下冰川湖可能代表着重要且很大程度上是孤立的微生物栖息地,并且是潜在的冰覆盖盐湖和整个太阳系行星体上透镜的引人注目的类似物。
更新日期:2018-04-12
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