Abstract

During cruise 43 of the R/V Akademik Nikolaj Strakhov (September 21–October 9, 2019), new data were obtained on the bottom relief, sedimentation, and hydrological regime of the Discovery Gap (eastern North Atlantic). It was shown that the upper limit of the Antarctic Bottom Water in the study area follows the 2.05°C isotherm and 34.91 PSU isohaline at depths of 4400–4700 m. A digital elevation model of the Discovery Gap relief was obtained. Three acoustic facies have been identified, which characterize dense bottom sediments and low sedimentation rates. Sediment cores ANS-43003, ANS-43004, and ANS-43006 are represented by light brown silty clays with foraminiferal sands and bioturbation. Strong dissolution of foraminifera was found in core ANS-43006, which indicates the formation of sediments below the calcium carbonate compensation depth.

中文翻译：

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R / V Akademik Nikolaj Strakhov巡游43期间发现间隙（东北大西洋）的综合海洋学研究

摘要

在R / V Akademik Nikolaj Strakhov的第43巡航期间（2019年9月21日至10月9日），获得了有关发现峡（北大西洋东部）的底部起伏，沉积和水文状况的新数据。结果表明，研究区南极底水的上限在4400–4700 m深度处遵循2.05°C等温线和34.91 PSU等盐线。获得了Discovery Gap浮雕的数字高程模型。已经确定了三个声相，它们表征了稠密的底部沉积物和低沉积速率。沉积物岩心ANS-43003，ANS-43004和ANS-43006以浅棕色粉质粘土为代表，这些土壤带有有孔虫砂和生物扰动。在核心ANS-43006中发现有孔虫强烈溶解，这表明在碳酸钙补偿深度以下形成了沉积物。