Vertical Structure of Current Velocity Shears in the Main Pycnocline of the Black Sea Based on the in situ Data in 2016

IF 0.7 Q4 OCEANOGRAPHY Physical Oceanography Pub Date : 2018-12-01 DOI:10.22449/0233-7584-2018-6-515-522
A. Morozov
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引用次数: 1

Abstract

The characteristic features of the averaged vertical structure of the current velocity shears are discussed based on the analysis of the LADCP/CTD data collected in three expeditions of the R/V “Professor Vodyanitsky” in the northern Black Sea in 2016: the 87 th cruise (June, 30 – July, 18); the 89 th cruise (September, 30 – October, 20) and the 91 st cruise (November, 16 – December, 5). The maximum of the shear average profile is noted in the main pycnocline layer in the vicinity of the buoyancy frequency maximum. The ratio of the shear mean square to the buoyancy frequency mean square increases almost monotonously with depth from 0.1 to 0.4 in the layer 50–350 m that can indicate (at a qualitative level) relative intensification of turbulent vertical mixing in the lower part of the main pycnocline. The mean profiles of the shear vector rotation angle relative to its direction on the horizon 15 m are given. On the average, the shear vector rotates clockwise and makes about two rotations in the main pycnocline layer. The revealed rotation of the shear vector is due to influence of the internal waves propagating downward at the close to inertial frequency. The hodographs of the current velocity shear exhibiting a well-pronounced rotation with depth are shown. Considered is the example of calculating the parameters of a near-inertial internal wave using the current velocity shear and deformation based on the data of one of the stations.
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基于2016年实测数据的黑海主斜斜洋流速度切变垂向结构
通过对2016年“Vodyanitsky教授”号在黑海北部进行的第87次巡航(6月30日至7月18日)所收集的LADCP/CTD数据的分析,讨论了当前速度切变的平均垂直结构特征;第89次(20年9月30日至10月)和第91次(11月16日至12月5日)。剪切平均剖面的最大值出现在浮力频率最大值附近的主斜层。在50 ~ 350 m层,剪切均方与浮力频率均方之比几乎随深度单调增加,从0.1增加到0.4,可以定性地表明主斜下部湍流垂直混合的相对增强。给出了在15 m水平面上相对于其方向的剪切矢量旋转角的平均剖面图。平均而言,剪切矢量在主斜斜层中顺时针旋转约两次。剪切矢量显示的旋转是由于内波以接近惯性频率向下传播的影响。显示了当前速度切变随深度的明显旋转。本文考虑了基于其中一个台站数据,利用当前速度、剪切和变形计算近惯性内波参数的实例。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Oceanography
Physical Oceanography OCEANOGRAPHY-
CiteScore
1.80
自引率
25.00%
发文量
8
审稿时长
24 weeks
期刊最新文献
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