Over recent decades, the West Antarctic Ice Sheet has experienced rapid thinning of its floating ice shelves as well as grounding line retreat across its marine‐terminating glaciers. The transport of warm Modified Circumpolar Deep Water (MCDW) onto the continental shelf, extensively documented along the West Antarctic Peninsula (WAP), and in the Amundsen Sea, has been identified as the key process for inducing these changes. The Bellingshausen Sea sits between the Amundsen Sea and the northern part of the WAP, but its oceanic properties remain remarkably under‐studied compared to surrounding regions. Here, we present observations collected from a hydrographic survey of the Bellingshausen Sea continental shelf in austral summer 2019. Using a combination of ship‐based and glider‐based CTD and lowered ADCP observations, we show that submarine troughs provide topographically steered pathways for MCDW from the shelf break toward deep embayments and ultimately under floating ice shelves. Warm MCDW enters the continental shelf at the deepest part of the Belgica Trough and flows onshore along the eastern side of the trough. Modification of these shoreward‐flowing waters by glacial melt is estimated by calculating meltwater fractions using an optimal multiparameter analysis. Meltwater is found to be elevated at the western edge of both the Latady and Belgica troughs. Meltwater distributions, consistent with other diagnostics, suggest a recirculation in each trough with modified waters eventually flowing westward upon leaving the Belgica Trough. Our results show that the Bellingshausen Sea is a critical part of the larger West Antarctic circulation system, linking the WAP and the Amundsen Sea.

中文翻译：

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贝林斯豪森海的货架环流

在过去的几十年中，南极西部冰原经历了其浮冰架的快速变薄以及跨海底冰川的地线撤退。沿南极西部半岛（WAP）以及在阿蒙森海广泛记录的温暖的改良圆极深水（MCDW）向大陆架的运输已被认为是引起这些变化的关键过程。贝灵斯豪森海位于阿蒙森海和WAP北部之间，但与周围地区相比，其海洋特性仍然被研究不足。在这里，我们展示了从2019年夏季的贝灵斯豪森海陆架水文勘测中收集的观测结果。结合使用基于舰船和滑翔机的CTD以及降低的ADCP观测值，我们表明，海底槽为MCDW提供了从陆架破裂到深处的诱饵，并最终在浮冰架下的地形导向路径。温暖的MCDW进入Belgica槽最深处的大陆架，并沿该槽的东侧向岸上流动。通过使用最佳多参数分析计算融水分数，可以估算出冰川融化作用对这些上流水的影响。发现融水在Latady槽和Belgica槽的西边都升高了。与其他诊断结果一致的融水分布表明，每个槽中都有再循环水，经过修改的水最终在离开Belgica槽后向西流动。我们的结果表明，贝灵斯豪森海是较大的南极环流系统的关键部分，