Turbulence and Mixing in a Shallow Shelf Sea From Underwater Gliders
Turbulence and Mixing in a Shallow Shelf Sea From Underwater Gliders
复制标题
水下滑翔机在浅陆架海中的湍流和混合
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Carpenter
中科院分区：
文献类型：
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作者：
L. K. Schultze;L. Merckelbach;J. Carpenter
季节性温跃层在浅海陆架海作为边界产生的湍流的天然屏障，阻尼标量传输到水柱的上部区域，并在一定程度上控制初级生产。为了更好地了解湍流和温跃层内的混合条件，两个独特的12和17天的数据集，连续测量的湍流动能（e）的耗散率的自主水下滑翔机收集分层良好的混合条件下。一个高度间歇性的e信号中观察到的分层温跃层区，这主要是由静态流（湍流活动指数低于7）的特点。的速率diapycnal混合保持相对恒定的大部分时间与较高的通量，负责底部混合层温度的增加大部分的峰值。水柱主要保持强烈分层，整个温跃层的大部分理查森数远高于2。湍流强度、切变强度和层结强度之间存在正相关关系，湍流强度与体Richardson数之间的趋势相对较弱，但表明e随体Richardson数的增大而增大。研究结果还强调了在定量湍流温跃层通量的解释困难，以及负责的机制。
The seasonal thermocline in shallow shelf seas acts as a natural barrier for boundary-generated turbulence, damping scalar transport to the upper regions of the water column, and controlling primary production to a certain extent. To better understand turbulence and mixing conditions within the thermocline, two unique 12- and 17-day datasets with continuous measurements of the dissipation rate of turbulent kinetic energy (e) collected by autonomous underwater gliders under stratified to well-mixed conditions are presented. A highly intermittent e signal was observed in the stratified thermocline region, which was mainly characterized by quiescent flow (turbulent activity index below 7). The rate of diapycnal mixing remained relatively constant for the majority of the time with peaks of higher fluxes that were responsible for much of the increase in bottom mixed layer temperature. The water column stayed predominantly strongly stratified, with a bulk Richardson number across the thermocline well above 2. A positive relationship between the intensity of turbulence, shear and stratification was found. The trend between turbulence levels and the bulk Richardson number was relatively weak, but suggests that e increases as the bulk Richardson number approaches 1. The results also highlight the interpretation difficulties in both quantifying turbulent thermocline fluxes, as well as the responsible mechanisms.
影响因子：
2.8
作者：
M. Palmer;G. R. Stephenson;M. Inall;C. Balfour;A. Düsterhus;J. Green
通讯作者：
M. Palmer;G. R. Stephenson;M. Inall;C. Balfour;A. Düsterhus;J. Green
影响因子：
3.5
作者：
Burchard, Hans;Rippeth, Tom P.
通讯作者：
Rippeth, Tom P.