Brine beneath Taylor Glacier has been proposed to enter the proglacial west lobe of Lake Bonney (WLB) as well as from Blood Falls, a surface discharge point at the Taylor Glacier terminus. The brine strongly influences the geochemistry of the water column of WLB. Year-round measurements from this study are the first to definitively identify brine intrusions from a subglacial entry point into WLB. Furthermore, we excluded input from Blood Falls by focusing on winter dynamics when the absence of an open water moat prevents surface brine entry. Due to the extremely high salinities below the chemocline in WLB, density stratification is dominated by salinity, and temperature can be used as a passive tracer. Cold brine intrusions enter WLB at the glacier face and intrude into the water column at the depth of neutral buoyancy, where they can be identified by anomalously cold temperatures at that depth. High-resolution measurements also reveal under-ice internal waves associated with katabatic wind events, a novel finding that challenges long-held assumptions about the stability of the WLB water column.

中文翻译：

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南极洲邦尼湖的冰下盐水流动和风致内波

泰勒冰川下的盐水被提议进入邦尼湖 (WLB) 的前冰川西叶，以及来自泰勒冰川终点的表面排放点血瀑布。盐水强烈影响 WLB 水柱的地球化学。这项研究的全年测量结果首次明确确定了从冰下入口点进入 WLB 的盐水入侵。此外，当没有开水护城河阻止地表盐水进入时，我们通过关注冬季动态排除了血瀑布的输入。由于WLB化学跃层以下盐度极高，密度分层以盐度为主，温度可作为被动示踪剂。冷盐水侵入在冰川面进入 WLB 并在中性浮力深度侵入水柱，它们可以通过该深度的异常低温来识别。高分辨率测量还揭示了与下沉风事件相关的冰下内波，这是一项新发现，挑战了长期以来关于 WLB 水柱稳定性的假设。