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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Observations on the relationship between scattering layer and mixedlayer
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Observations on the relationship between scattering layer and mixedlayer

机译：散射层与混合层之间关系的观察

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摘要

High-resolution (stations at every 3 nautical mile interval) physical oceanographic measurements were carried out in the shallow waters (<150 m depth) of northeastern Arabian Sea during December 2003. Temperature and salinity data showed tri-layer structure, i.e. a strong thermocline sandwiched between an upper and a bottom homogeneous layer. Thickness of the surface homogeneous layer varied between 20 and 60 m, while that of the bottom layer varied from 23 to 85 m. Thermocline thickness varied from 7 to 20 m and the respective gradients from 0.12 to 0.4 degree C/m, with maximum gradient coinciding with minimum thickness. The temperature and salinity structure revealed two distinct water-masses in the surface and bottom homogeneous layers, with a strong thermocline in the transition zone. The dynamically unstable conditions in the upper and lower homogeneous layers and highly stable conditions in the thermocline result in the formation of the tri-layer structure in this region. When the thermocline was strong, the scattering layer was well demarked, whereas the layer was not well demarked when the thermocline was weak. Gradient in the thermocline is found to restrict the downward transfer of scatterers across the thermocline. This information can be utilized to estimate the depth of the surface mixed layer from echograms with a good degree of accuracy.
机译：2003年12月，在阿拉伯东北海的浅水区（深度小于150 m）中进行了高分辨率（每3海里间隔的站）物理海洋学测量。温度和盐度数据显示为三层结构，即强温跃层夹在上下均质层之间。表面均匀层的厚度在20至60 m之间变化，而底层的厚度在23至85 m之间变化。跃层厚度从7到20 m不等，各自的梯度从0.12到0.4摄氏度/米不等，最大梯度与最小厚度一致。温度和盐度结构在表面和底部均质层中显示出两个截然不同的水团，在过渡带中有很强的温跃层。上下均质层中的动态不稳定条件和温跃层中的高度稳定条件导致在该区域中形成三层结构。当温度跃迁很强时，散射层的标记效果很好，而当温度跃迁很弱时，散射层的标记效果不好。发现热跃线中的梯度限制了散射体在热跃线上的向下转移。该信息可用于以良好的准确度从回波图估计表面混合层的深度。

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