Evidence of a hydrological connection between the ice divide and ice sheet margin in the Aurora Subglacial Basin, East Antarctica
Evidence of a hydrological connection between the ice divide and ice sheet margin in the Aurora Subglacial Basin, East Antarctica
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DOI：
10.1029/2011jf002066
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发表时间：
2012-03
影响因子：
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通讯作者：
A. Wright;D. Young;J. Roberts;D. Schroeder;J. Bamber;J. Dowdeswell;N. Young;A. L. Brocq;R. Wa
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文献类型：
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作者：
A. Wright;D. Young;J. Roberts;D. Schroeder;J. Bamber;J. Dowdeswell;N. Young;A. L. Brocq;R. Wa
东南极洲的冰下水文学知之甚少，但可能对冰流动的方式至关重要。一项新的区域航空地球物理调查(ICECAP)的数据改变了我们对与东南极287,000平方公里的奥罗拉冰下盆地有关的地形和冰川学的理解。利用这些数据，结合冰盖数值模拟，我们提出了一套分析，证明了1000公里长的盆地作为从冰盖内部向冰盖边缘排放冰下水的途径的潜力。我们介绍了我们对基本地形、河床粗糙度和雷达功率反射率的分析结果，以及我们对冰盖流动和基本冰温的模拟结果。虽然在奥罗拉盆地内没有发现明显的冰下湖泊，但观察到数十个类似湖泊的反射体，结合这里报告的其他结果，支持这样的假设，即该盆地是允许从冰穹C分水岭附近的冰下湖泊排放污水通过托滕冰川到达海岸的通道。
Subglacial hydrology in East Antarctica is poorly understood, yet may be critical to the manner in which ice flows. Data from a new regional airborne geophysical survey (ICECAP) have transformed our understanding of the topography and glaciology associated with the 287,000 km2 Aurora Subglacial Basin in East Antarctica. Using these data, in conjunction with numerical ice sheet modeling, we present a suite of analyses that demonstrate the potential of the 1000 km-long basin as a route for subglacial water drainage from the ice sheet interior to the ice sheet margin. We present results from our analysis of basal topography, bed roughness and radar power reflectance and from our modeling of ice sheet flow and basal ice temperatures. Although no clear-cut subglacial lakes are found within the Aurora Basin itself, dozens of lake-like reflectors are observed that, in conjunction with other results reported here, support the hypothesis that the basin acts as a pathway allowing discharge from subglacial lakes near the Dome C ice divide to reach the coast via the Totten Glacier.