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首页> 外文期刊>Journal of Physical Oceanography >Lagrangian Observations of the Middepth and Deep Velocity Fields of the Northeastern Atlantic Ocean
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Lagrangian Observations of the Middepth and Deep Velocity Fields of the Northeastern Atlantic Ocean

机译：拉格朗日对东北大西洋中深层速度场的观测

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摘要

The circulation of the northeastern Atlantic Ocean at intermediate depths is characterized by watermass transformation processes that involve Iceland-Scotland Overflow Water (ISOW) from the northeast, Labrador Sea Water (LSW) from the west, and Mediterranean Water from the south. Field observations were carried out with 89 eddy-resolving floats (RAFOS and MARVOR types). The data coverage achieved is remarkably high and enables a comprehensive study of the eastern basins between Iceland and the Azores. The trajectories show typical pathways of the water masses involved and the role that the complex bottom topography plays in defining them. The ISOW paths tend to lean against the slopes of the Reykjanes Ridge and Rockall Plateau. Westward escapes through multiple gaps in the ridge are possible, superimposed on a sustained southward flow in the eastern basin along the Mid-Atlantic Ridge. LSW pathways leading to the eastern basins are subject to high variability in flow direction and eddy activity. In addition to a selection of characteristic trajectories, maps of the horizontal distributions of Lagrangian eddy kinetic energy and integral time scales are presented. These reveal distinct areas of intensified mixing in the Iceland Basin, as well as the sharp contrast between the subpolar and subtropical dynamics. A self-contained eddy detection scheme is applied to obtain statistics on individual eddy properties and their abundance. It is suggested that much of the intensified mixing can be related to cyclonic activity, particularly in the subpolar region.
机译：东北大西洋中深度的环流特征是水质转化过程，其中包括东北的冰岛-苏格兰溢水（ISOW），西部的拉布拉多海水（LSW）和南部的地中海水。使用89个旋涡浮子（RAFOS和MARVOR类型）进行了实地观察。取得的数据覆盖率非常高，可以对冰岛和亚速尔群岛之间的东部盆地进行全面研究。这些轨迹显示了所涉水团的典型路径，以及复杂的底部地形在定义水团方面所起的作用。 ISOW路径倾向于倚靠在雷克雅尼斯山脊和Rockall高原的斜坡上。可能会通过山脊中的多个缝隙向西逃逸，同时又会沿着中大西洋海脊在东部盆地不断向南流动。通往东部盆地的LSW路径在流动方向和涡流活动方面变化很大。除了选择特征轨迹外，还提供了拉格朗日涡动能水平分布图和积分时标。这些揭示了冰岛盆地强烈混合的不同区域，以及亚极和亚热带动力学之间的鲜明对比。应用独立的涡流检测方案来获得有关单个涡流特性及其丰度的统计信息。有人认为，许多强化混合可能与气旋活动有关，特别是在亚极地区。

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