(Table 1) Ice thickness of new subglacial lakes identified in the ICECAP RES data and of previously known subglacial lakes

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 km**2 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.东南极洲的冰下水文（Subglacial hydrology）研究尚未得到充分开展，但其对冰盖流动模式或有关键影响。新的区域航空地球物理探测（airborne geophysical survey）项目ICECAP所获数据，彻底革新了我们对东南极洲28.7万平方千米奥罗拉冰下盆地（Aurora Subglacial Basin）相关地形与冰川学特征的认知。依托该数据集并结合数值冰盖模拟（numerical ice sheet modeling），我们开展了一系列分析工作，证实该长达1000千米的盆地具备作为冰下径流通道的潜力，可将冰盖内部的冰下水流输送至冰盖边缘。我们展示了针对基底地形（basal topography）、床面粗糙度（bed roughness）与雷达功率反射率（radar power reflectance）的分析结果，以及冰盖流动与冰床温度（basal ice temperatures）的模拟结果。尽管奥罗拉盆地内部未发现清晰可辨的冰下湖（subglacial lakes），但观测到数十处类湖反射特征；结合本文报道的其他研究结果，该观测结果支持如下假说：该盆地可作为径流通道，使穹顶C冰盖分水岭（Dome C ice divide）附近的冰下湖水经托滕冰川（Totten Glacier）抵达沿海区域。