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首页> 外文期刊>Journal of Physical Oceanography >On the Nature of the Mesoscale Variability in Denmark Strait
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On the Nature of the Mesoscale Variability in Denmark Strait

机译：丹麦海峡中尺度变率的性质

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Time series data from a mooring in the center of Denmark Strait and a collection of shipboard hydrographic sections occupied across the sill are used to elucidate themesoscale variability of the dense overflowwater in the strait. Two dominant, reoccurring features are identified that are referred to as a bolus and a pulse. A bolus is a large, weakly stratified lens of overflow water associated with cyclonic rotation and a modest increase in alongstream speed of 0.1ms(-1). When a bolus passes through the strait the interface height of the overflow layer increases by 60m, and the bottom temperature decreases by 0.4 degrees C. By contrast, a pulse is characterized by anticyclonic rotation, a strong increase in along-stream speed of >0.25ms(-1), a decrease in interface height of 90m, and no significant bottom temperature signal. It is estimated that, on average, boluses (pulses) pass through the strait every 3.4 (5.4) dayswith no seasonal signal to their frequency. Both features have the strongest along-stream signal in the overflow layer, while the strongest cross-stream velocities occur above the Denmark Strait overflow water (DSOW). In this sense neither feature can be characterized as a simple propagating eddy. Their dynamics appear to be similar to that ascribed to the mesoscale variability observed downstream in the deep western boundary current. Strong correlation of bottom temperatures between the mooring in Denmark Strait and a downstream array, together with a match in the frequency of occurrence of features at both locations, suggests a causal relationship between the mesoscale variability at the sill and that farther downstream.
机译：来自丹麦海峡中部的一个系泊的时间序列数据和整个船槛占据的船上水文断面的集合被用来阐明海峡中稠密溢流的主尺度变化。确定了两个主要的重复出现特征，称为推注和脉冲。推注是与旋风旋转相关的溢流水的大的，薄弱分层的晶状体，其沿流速度适度增加了0.1ms（-1）。推注通过海峡时，溢流层的界面高度增加60m，底部温度降低0.4摄氏度。相比之下，脉冲的特征在于反气旋旋转，沿流速度> 0.25的强烈增加ms（-1），界面高度降低90m，并且没有明显的底部温度信号。据估计，平均每隔3.4（5.4）天，团块（脉冲）通过海峡一次，而频率没有季节性信号。这两个特征在溢流层中都具有最强的沿流信号，而最强的横流速度则发生在丹麦海峡溢流水（DSOW）之上。从这个意义上讲，任何一个特征都不能被描述为简单的传播涡流。它们的动力学似乎类似于在深西部边界流下游观察到的中尺度变化。丹麦海峡系泊设备与下游阵列之间底部​​温度的强烈相关性，以及两个位置特征出现频率的匹配，都表明门槛和下游更远的中尺度变化之间存在因果关系。

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