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首页> 外文期刊>Journal of Physical Oceanography >Surface Circulation At The Tip Of The Antarctic Peninsula From Drifters
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Surface Circulation At The Tip Of The Antarctic Peninsula From Drifters

机译：漂流者在南极半岛尖端的表面循环

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An array of 40 surface drifters, drogued at 15-m depth, was deployed in February 2007 to the east of the tip of the Antarctic Peninsula as part of the Antarctic Drifter Experiment: Links to Isobaths and Ecosystems (ADELIE) project. Data obtained from these drifters and from a select number of local historical drifters provide the most detailed observations to date of the surface circulation in the northwestern Weddell Sea. The Antarctic Slope Front (ASF), characterized by a ～20 cm s~(-1) current following the 1000-m isobath, is the dominant feature east of the peninsula. The slope front bifurcates when it encounters the South Scotia Ridge with the drifters following one of three paths. Drifters (i) are carried westward into Bransfield Strait; (ii) follow the 1000-m isobath to the east along the southern edge of the South Scotia Ridge; or (iii) become entrained in a large-standing eddy over the South Scotia Ridge. Drifters are strongly steered by contours of f/h (Coriolis frequency/depth) as shown by calculations of the first two moments of displacement in both geographic coordinates and coordinates locally aligned with contours of f/h. An eddy-mean decomposition of the drifter velocities indicates that shear in the mean flow makes the dominant contribution to dispersion in the along-f/h; direction, but eddy processes are more important in dispersing particles across contours of f/h. The results of the ADELIE study suggest that the circulation near the tip of the Antarctic Peninsula may influence ecosystem dynamics in the Southern Ocean through Antarctic krill transport and the export of nutrients.
机译：作为“南极漂流者实验：等压线与生态系统”（ADELIE）项目的一部分，2007年2月在南极半岛尖端东部部署了一系列40个表面疏ers器，它们的深度为15 m。从这些漂流者和一定数量的局部历史漂流者获得的数据提供了迄今为止西北魏德海地表环流最详细的观测结果。南极斜坡前缘（ASF）的特征是在半岛以东1000米处有〜20 cm s〜（-1）电流，是该半岛东部的主要特征。当坡道遇到南斯科舍省山脊时，分流器沿着三个路径之一分叉。漂流者（i）向西进入布兰斯菲尔德海峡； （ii）沿南斯科舍脊的南缘向东延伸1000米的等压线；或（iii）在南斯科舍省脊上被卷入一个大型涡流中。 f / h的轮廓（科里奥利频率/深度）强烈地影响了漂移，如地理坐标和与f / h轮廓局部对齐的坐标的前两个位移的计算所示。漂移速度的涡旋均值分解表明，平均流量中的剪切力对沿f / h方向的弥散起主要作用。方向，但涡流过程在将颗粒沿f / h轮廓分布时更为重要。 ADELIE研究的结果表明，南极半岛尖端附近的环流可能通过南极磷虾的运输和养分的输出影响南大洋的生态系统动态。

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