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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >The evolution of a thin phytoplankton layer in strong turbulence
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The evolution of a thin phytoplankton layer in strong turbulence

机译：强湍流中浮游植物薄层的演化

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摘要

Simultaneous and collocated spatial measurements of turbulence, fine structure, and chlorophyll a fields were made from the Autonomous Underwater Vehicle T-REMUS as a part of the Layered Organization in the Coastal Ocean (LOCO) experiment. The T-REMUS was operated in a cycling 51 yo-yo mode. Deployments were of 8 h duration and consisted of a series of across isobath legs, each of 2.5km in extent. From the suite of sensors onboard the T-REMUS vehicle we are able to measure directly the turbulent eddy velocity, we 1/4 ffieffiffi=ffiffiNffiffiffiffi p , and turbulent Reynolds number, Reb 1/4 (e/vN2), in the vicinity of a thin chlorophyll a layer. Using the turbulent eddy velocity, we develop criteria for when phytoplankton will behave as passive Lagrangian tracers. The turbulent Reynolds number is used as an indicator of turbulence strength, with the criterion of Reb 1/4 200 the boundary between weak and strong turbulence. We present data for the case of a spatially extensive thin layer being advected into the T-REMUS LOCO site. Using the above criterion, we observe that thin chlorophyll a layers can exist and be embedded as passive Lagrangian tracers in both weak and strong turbulent conditions. During a time period of weak turbulence Rebo200 little diffusion occurs and the thin layer remains compact. Under strong turbulence Reb4200 the thin layer weakens and diffuses as it is advected through the experimental site.
机译：湍流，精细结构和叶绿素a场的同时并置空间测量是从自主水下航行器T-REMUS进行的，作为沿海海洋分层组织（LOCO）实验的一部分。 T-REMUS以循环51 yo-yo模式运行。展开时间为8小时，由一系列跨等压线腿组成，每条腿长2.5公里。通过T-REMUS车辆上的传感器套件，我们能够直接测量湍流涡流速度，即1/4 ffieffiffi = ffiffiNffiffiffiffi p，以及湍流雷诺数Reb 1/4（e / vN2）。薄薄的叶绿素一层。利用湍流的涡流速度，我们为浮游植物何时充当被动拉格朗日示踪剂制定了标准。湍流雷诺数用作湍流强度的指标，以Reb 1/4 200的标准为弱湍流和强湍流之间的边界。我们提供的数据是将空间扩展薄层平移到T-REMUS LOCO站点中的情况。使用上述标准，我们观察到薄薄的叶绿素a层可以存在，并且在弱和强湍流条件下都可以作为被动拉格朗日示踪剂嵌入。在Rebo200湍流较弱的时期，几乎没有扩散发生，并且薄层保持致密。在强烈的湍流下，Reb4200的薄层在通过实验点对流时会减弱并扩散。

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