Location for direct access to subglacial Lake Ellsworth: An assessment of geophysical data and modeling
Location for direct access to subglacial Lake Ellsworth: An assessment of geophysical data and modeling
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DOI：
10.1029/2010gl042884
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发表时间：
2010-06
影响因子：
5.2
通讯作者：
J. Woodward;A. Smith;N. Ross;M. Thoma;H. Corr;E. King;Matt A. King;K. Grosfeld;M. Tranter;M. Siegert
中科院分区：
文献类型：
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作者：
J. Woodward;A. Smith;N. Ross;M. Thoma;H. Corr;E. King;Matt A. King;K. Grosfeld;M. Tranter;M. Siegert
冰下埃尔斯沃思湖已被提议作为直接测量和采样的候选者，以识别微生物生命并提取沉积气候记录。我们通过地球物理调查对这个冰下湖的地貌进行了详细的描述，从而可以建立水深测量和地貌环境。埃尔斯沃斯湖长 14.7 公里 × 3.1 公里，面积 28.9 平方公里。湖水下游深度由52 m增至156 m，水体体积1.37 km3。冰的厚度表明了一种不寻常的热力学特征，临界压力边界与湖相交。水循环的数值模型可以估计基底冰的积聚。我们整理了这些地形和建模信息，以确认埃尔斯沃思湖是直接进入的理想选择，并提出了最佳钻探地点。还评估了湖泊和钻孔之间溶解气体交换的可能性。
Subglacial Lake Ellsworth has been proposed as a candidate for direct measurement and sampling, to identify microbial life and extract sedimentary climate records. We present a detailed characterization of the physiography of this subglacial lake from geophysical surveys, allowing bathymetry and geomorphic setting to be established. Lake Ellsworth is 14.7 km × 3.1 km with an area of 28.9 km2. Lake depth increases downlake from 52 m to 156 m, with a water body volume of 1.37 km3. The ice thickness suggests an unusual thermodynamic characteristic, with the critical pressure boundary intersecting the lake. Numerical modeling of water circulation has allowed accretion of basal ice to be estimated. We collate this physiographic and modeling information to confirm that Lake Ellsworth is ideal for direct access and propose an optimal drill site. The likelihood of dissolved gas exchange between the lake and the borehole is also assessed.