Discovery of a hypersaline subglacial lake complex beneath Devon Ice Cap, Canadian Arctic.
Discovery of a hypersaline subglacial lake complex beneath Devon Ice Cap, Canadian Arctic.
复制标题
DOI：
10.1126/sciadv.aar4353
复制
发表时间：
2018-04
期刊：
影响因子：
13.6
通讯作者：
Young DA
中科院分区：
文献类型：
--
作者：
Rutishauser A;Blankenship DD;Sharp M;Skidmore ML;Greenbaum JS;Grima C;Schroeder DM;Dowdeswell JA;Young DA
一个可能的类似物，在行星冰体上的盐湖潜伏在加拿大北极冰盖之下。冰下湖泊是独特的环境，尽管极端黑暗和寒冷的条件下，已被证明是微生物生命的宿主。在南极洲和格陵兰岛的冰盖下发现了许多冰下湖泊，但没有空间孤立的水体被记录为高盐。我们使用无线电回声测深测量，以确定两个冰下湖泊位于基岩槽附近的冰分水岭的德文郡冰帽，加拿大北极。模拟的湖区基底冰温度不高于−10.5°C，表明这些湖泊由高盐水组成。这种高盐度的含义与周围的地质情况相一致，这表明冰下湖泊位于含有层状盐序列的富含碳酸盐的沉积物单元内，这可能是盐水的溶质来源。我们的研究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冰下湖泊。我们的结论是，这些以前未知的高盐冰下湖泊可能代表了重要的和基本上孤立的微生物栖息地，并在整个太阳系的行星体上的潜在的冰覆盖的盐水湖和透镜引人注目的类似物。
A possible analog for saline lakes on planetary ice bodies lurks beneath a Canadian Arctic ice cap. 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.
登录
查看更多内容
影响因子：
18.3
作者：
Greenbaum, J. S.;Blankenship, D. D.;Siegert, M. J.
通讯作者：
Siegert, M. J.
DOI：
10.1111/j.1365-246x.1978.tb05931.x
发表时间：
1978-01-01
期刊：
GEOPHYSICAL JOURNAL OF THE ROYAL ASTRONOMICAL SOCIETY
影响因子：
--
作者：
PATERSON, WSB;CLARKE, GKC
通讯作者：
CLARKE, GKC
影响因子：
3.4
作者：
Burgess, DO;Sharp, MJ;Benham, TJ
通讯作者：
Benham, TJ
影响因子：
5
作者：
Lyons, WB;Welch, KA;Poreda, RJ
通讯作者：
Poreda, RJ
影响因子：
5.2
作者：
Palmer, Steven J.;Dowdeswell, Julian A.;Siegert, Martin J.
通讯作者：
Siegert, Martin J.