Exchange of Water Between the Ross Gyre and ACC Assessed by Lagrangian Particle Tracking

Exchange of Water Between the Ross Gyre and ACC Assessed by Lagrangian Particle Tracking
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通过拉格朗日粒子追踪评估罗斯环流和 ACC 之间的水交换

DOI:
10.1029/2018jc014845
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发表时间:
2019
期刊:
Journal of Geophysical Research: Oceans
影响因子:
--
通讯作者:
Speer, Kevin
Speer, Kevin
中科院分区:
--
文献类型:
--
作者:
Roach, Christopher J.;Speer, Kevin

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为了到达南大洋季节性海冰覆盖深处的上升流和下降流区域,水团必须穿过南极绕极流并通过包括罗斯环流、威德尔环流和南极坡流在内的洋流系统。在这项研究中,我们将注意力集中在罗斯环流与周围洋流系统之间的拉格朗日交换。我们使用来自南大洋状态估计的五天 3D 速度场和粒子跟踪包进行了数值实验,以确定海水从南极海岸边缘附近或南极绕极流移动到罗斯环流内部的路径,并确定与这些路径相关的变化的时间尺度。来自南极边缘附近的海水沿着环流的西部和北部边界进入罗斯环流,直到环流在断裂带附近与太平洋-南极海脊分离。此时,南极绕极流衍生的流入量主导了到达南极边缘的跨环流输送。计算与流量的不同时间平均分量相关的传输和交换,以确定高频、低频和时间平均分量的相对贡献。
To reach upwelling and downwelling zones deep within the Southern Ocean seasonal sea ice cover, water masses must move across the Antarctic Circumpolar Current and through current systems including the Ross Gyre, Weddell Gyre, and Antarctic Slope Current. In this study we focus our attention on the Lagrangian exchange between the Ross Gyre and surrounding current systems. We conducted numerical experiments using five‐day 3‐D velocity fields from the Southern Ocean State Estimate with a particle tracking package to identify pathways by which waters move from near the Antarctic coastal margins or Antarctic Circumpolar Current into the interior of the Ross Gyre, and to identify the time scales of variability associated with these pathways. Waters from near the Antarctic margins enter the Ross Gyre along the western and northern boundaries of gyre until the gyre separates from the Pacific‐Antarctic Ridge near fracture zones. At this juncture, Antarctic Circumpolar Current‐derived inflow dominates the across‐gyre transport up to the Antarctic margin. Transport and exchange associated with different time‐average components of flow are calculated to determine the relative contributions of high‐ and low‐frequency and time‐mean components.
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