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首页> 外文期刊>Journal of Physical Oceanography >Persistent Lagrangian Transport Patterns in the Northwestern Gulf of Mexico
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Persistent Lagrangian Transport Patterns in the Northwestern Gulf of Mexico

机译：墨西哥西北海湾的持久拉格朗日运输模式

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摘要

Persistent Lagrangian transport patterns at the ocean surface are revealed from climatological Lagrangian coherent structures (cLCSs) computed from daily climatological surface current velocities in the northwestern Gulf of Mexico (NWGoM). The climatological currents are computed from daily velocities produced by an 18-yr-long free-running submesoscale-permitting Nucleus for European Modelling of the Ocean (NEMO) simulation of the Gulf of Mexico. Despite the intense submesoscale variability produced by the model along the shelf break, which is found to be consistent with observations and previous studies, a persistent mesoscale attracting barrier between the NWGoM shelf and the deep ocean is effectively identified by a hook-like pattern associated with persistent strongly attracting cLCSs. Simulated tracer and satellite-tracked drifters originating over the shelf tend to be trapped there by the hook-like pattern as they spread cyclonically. Tracers and drifters originating beyond the shelf tend to be initially attracted to the hook-like pattern as they spread anticyclonically and eventually over the deep ocean. The findings have important implications for the mitigation of contaminant accidents such as oil spills.
机译：通过从墨西哥西北湾（NWGoM）的每日气候面当前流速计算出的气候学Lagrangian相干结构（cLCS）可以揭示海洋表面的持久性Lagrangian运移模式。根据由墨西哥湾的欧洲海洋模拟（NEMO）模拟的18年自由运行的亚中尺度许可核产生的每日速度来计算气候流。尽管该模型沿架子断裂产生了强烈的亚中尺度变化，这与观测和先前的研究一致，但通过与之相关的钩状模式，可以有效地识别出西北太平洋高架架子和深海之间的持久中尺度吸引壁垒。持续强烈吸引cLCS。起源于架子的模拟示踪剂和卫星跟踪的漂流器在旋风传播时往往被钩状图案困住。起源于架子以外的示踪剂和漂流物最初以钩状图案吸引，因为它们呈反圈状扩散并最终扩散到深海。这些发现对于减轻诸如石油泄漏等污染事故具有重要意义。

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