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首页> 外文期刊>Journal of Physical Oceanography >The Influence of Wind Forcing on the Chesapeake Bay Buoyant Coastal Current
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The Influence of Wind Forcing on the Chesapeake Bay Buoyant Coastal Current

机译：强迫风对切萨皮克湾浮力海岸流的影响

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Observations of the buoyant coastal current that flows southward from Chesapeake Bay are used to describe how the thickness, width, and propagation speed vary in response to changes in the along-shelf wind stress. Three basic regimes were observed depending on the strength of the wind. For weak wind stresses (from -0.02 to 0.02 Pa), the buoyant coastal current was relatively thin, the front slope was not steep, and the width was variable (1-20 km). For moderate downwelling (southward) wind stresses (0.02-0.07 Pa), wind-driven cross-shelf advection steepened the front, causing the plume to narrow and thicken. For stronger downwelling wind stresses (greater than 0.07 Pa), vertical mixing dominated, bulk Richardson numbers were approximately 0.25, isopycnals were nearly vertical, and the plume front widened but the plume width did not change. Plume thickness and width were normalized by the theoretical plume scales in the absence of wind forcing. Normalized plume thickness increased linearly from 1 to 2 as downwelling wind stresses increased from 0 to 0.2 Pa. Normalized plume widths were approximately 1 for downwelling wind stresses from 0.02 to 0.2 Pa. The observed along-shelf propagation speed of the plume was roughly equal to the sum of the theoretical propagation speed and the wind-driven along-shelf flow.
机译：从切萨皮克湾向南流动的浮力海流的观测数据被用来描述厚度，宽度和传播速度如何响应于沿架风应力的变化而变化。根据风的强度，观察到三个基本状态。对于弱风应力（从-0.02到0.02 Pa），沿海浮力相对较薄，前坡不陡，宽度可变（1-20 km）。对于中等程度的下降（​​向南）风应力（0.02-0.07 Pa），风力驱动的横架对流会使前部变陡，导致羽流变窄和变厚。对于更强的下行风应力（大于0.07 Pa），垂直混合占主导，Richardson散装数大约为0.25，等渗近似于垂直，羽流前端变宽，但羽流宽度没有变化。在没有风力的情况下，通过理论羽尺度将羽厚度和宽度标准化。当下降风向应力从0到0.2 Pa增加时，归一化羽流厚度从1线性增加到2。对于下降风向应力从0.02到0.2 Pa，归一化羽流宽度大约为1。观察到的沿着烟道的沿架子传播速度大致等于理论传播速度和风驱动的沿架流的总和。

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