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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：作为连贯的海湾流传输异常的触发器环电流可变性

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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：高分辨率海洋模型的卫星观测和输出用于调查墨西哥湾的环流如何影响佛罗里达州海峡的海湾溪流运输。我们发现环流的扩展（收缩）通过佛罗里达州海峡导致较低（更高）的运输。相关的表面速度异常是从佛罗里达州西南尖端到哈特拉斯的连贯的。可以使用简单的基于连续性的参数来解释环路电流和下游海湾流程传输之间的联系：随着环路电流长度（缩短）其路径在墨西哥湾的路径中，墨西哥湾的流量减少（增加） 。表面速度场中的异常将首先看到佛罗里达西南部，在4周内通过佛罗里达海峡飞往哈特拉斯，进入海湾流延伸。在这两种观察和模型中，这种传播可以被视为表面速度的脉冲。我们估计环电流可变性可以通过佛罗里达州海峡（1SV = 10（6）次）（3）秒）的可变性链接到通过佛罗里达州海峡。环路电流可变性的确切定时在很大程度上不可预测，超过几周，因此其变异性可能是海湾流的混沌/固有变异性的主要因素。然而，环电流与墨西哥湾下游的流动之间的时间滞后意味着如果观察到环电流的延长/缩短，则这在下游流动中引入了几周的一些可预测性。

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