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首页> 外文期刊>Journal of Physical Oceanography >Loop Current Variability as Trigger of Coherent Gulf Stream Transport Anomalies
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Loop Current Variability as Trigger of Coherent Gulf Stream Transport Anomalies

机译：环流变化是相干海湾流传输异常的触发因素

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Satellite observations and output from a high-resolution ocean model are used to investigate how the Loop Current in the Gulf of Mexico affects the Gulf Stream transport through the Florida Straits. We find that the expansion (contraction) of the Loop Current leads to lower (higher) transports through the Straits of Florida. The associated surface velocity anomalies are coherent from the southwestern tip of Florida to Cape Hatteras. A simple continuity-based argument can be used to explain the link between the Loop Current and the downstream Gulf Stream transport: as the Loop Current lengthens (shortens) its path in the Gulf of Mexico, the flow out of the Gulf decreases (increases). Anomalies in the surface velocity field are first seen to the southwest of Florida and within 4 weeks propagate through the Florida Straits up to Cape Hatteras and into the Gulf Stream Extension. In both the observations and the model this propagation can be seen as pulses in the surface velocities. We estimate that the Loop Current variability can be linked to a variability of several Sverdrups (1Sv = 10(6) m(3) s(-1)) through the Florida Straits. The exact timing of the Loop Current variability is largely unpredictable beyond a few weeks and its variability is therefore likely a major contributor to the chaotic/intrinsic variability of the Gulf Stream. However, the time lag between the Loop Current and the flow downstream of the Gulf of Mexico means that if a lengthening/shortening of the Loop Current is observed this introduces some predictability in the downstream flow for a few weeks.
机译：卫星观测和高分辨率海洋模型的输出用于调查墨西哥湾的环流如何影响通过佛罗里达海峡的海湾流运输。我们发现回路电流的膨胀（收缩）导致通过佛罗里达海峡的运输量降低（更高）。从佛罗里达州的西南端到哈特拉斯角，相关的表面速度异常是连贯的。一个简单的基于连续性的论点可用于解释环流与下游湾流之间的联系：随着环流加长（缩短）其在墨西哥湾的路径，从墨西哥湾流出的流量减少（增加） 。表面速度场的异常首先出现在佛罗里达州的西南部，并在4周内通过佛罗里达海峡传播到哈特拉斯角并进入墨西哥湾流扩展。在观测值和模型中，这种传播都可以看作是表面速度的脉冲。我们估计环路电流的可变性可以与通过佛罗里达海峡的几个Sverdrups（1Sv = 10（6）m（3）s（-1））的可变性相关。环路电流变化的确切时间在几周后基本上无法预测，因此其变化可能是造成墨西哥湾流混沌/本征变化的主要原因。但是，回路电流与墨西哥湾下游流之间的时间差意味着如果观察到回路流延长/缩短，则会在下游流中引入一些可预测性，持续数周。

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