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Direct Measurements of the Malvinas Current Velocity Structure

机译：直接测量Malvinas Current Velocity结构

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Direct velocity measurements of the Malvinas Current (MC) were carried out on multiple occupations of five transects across the flow using a Shipborne Acoustic Current Profiler (SADCP) on the R/V Akademik Sergey Vavilov and Akademik Mstislav Keldysh. These data are used to determine local features of the three-dimensional velocity field of the current. The occupations covered the northern branch of the Antarctic Circumpolar Current (ACC) and the southern part of the MC. Five transects across the flow were located at 350-550 km from each other from the Drake Passage to the western Argentine Basin at 46°S. The new observations reveal that the current is organized in two branches, namely, an inshore branch extending to a depth of 200-300 m and a main offshore branch, which flows approximately over the 1,400 m isobath. This two-branch structure is observed on each of the cross-flow transects. The observed velocities of the inshore branch exceed 40 cm/s on each studied crossing of the current. The MC is a cold western boundary current that follows the Subantarctic Front. This flow originates as an offshoot of the northern branch of the ACC and continues over the Falkland/Malvinas Plateau and along the western slope of the Argentine Basin. Volume transports of the upper 700 m of the MC calculated for each crossing range between 1.4 and 4.4 Sv for the inshore branch and between 21.2 and 25.5 Sv for the offshore (main) branch.
机译：使用R / V Akademik Sergey Vavilov和Akademik Mstislav Keldysh和Akademik Mstislav Keldysh对流量的五个横断面的多个横断面的多个途径的直接速度测量。这些数据用于确定电流的三维速度场的本地特征。职业覆盖了南极环球电流（ACC）和MC的南部的北部分支。流动的五个横断面位于46°S的德雷克通道彼此的350-550公里。新的观察结果表明，电流在两个分支中组织，即延伸到200-300米的深度和主要海上分支的近孔分支，其大约超过1,400米的isobath。在每个交叉流转换上观察到该两个分支结构。观察到的近孔分支的速度超过了每次研究电流的交叉的40厘米/秒。 MC是遵循小提治局前面的冷氏界界电流。这种流量源于ACC的北部分支机构，并继续沿着福克兰/马尔维纳斯高原和阿根廷盆地的西坡。 MC的上部700米的体积输送为近岸分支为1.4和4.4秒之间的每个交叉范围，为海上（主要）分支的21.2和25.5 SV。

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  • 来源
    《Oceanographic Literature Review》 |2021年第6期|1187-1187|共1页
  • 作者

    D.I. Frey; A.R. Piola; V.A. Krechik;

  • 作者单位

    Shirshov Institute of Oceanology Russian Academy of Sciences Moscow Russian Federation;

    Shirshov Institute of Oceanology Russian Academy of Sciences Moscow Russian Federation;

    Shirshov Institute of Oceanology Russian Academy of Sciences Moscow Russian Federation;

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