Abstract

The results of quasi-synchronous satellite and experimental field observations of two submesoscale eddy dipoles in the coastal zone of the southeastern Baltic Sea near the coast of Kaliningrad Region are presented. The parameters of eddy dipole dynamics, namely, the duration of the process in the sea water and its propagation velocity and direction, as well as atmospheric conditions favorable for the occurrence of eddy dipoles, are determined from consecutive satellite images of high resolution. The characteristics of the three-dimensional structure of eddy dipoles are determined using the data of an acoustic current profiler and a hydrological probe obtained concurrently with satellite survey. The depth of vortical motion penetration into the water column is discussed and it is shown that such processes are not purely surface phenomena but have their influence down to a depth of 20 m and more. Direct measurements of current velocities and directions within particular parts of an eddy dipole demonstrate significantly greater dynamics of waters inside such formations compared to their displacement velocity. The differences in the anticyclonic and cyclonic parts of the dipoles are evaluated. Hydrological observations show the influence of the active cyclonic part of a dipole on surrounding waters manifested in both capture (rise) of deeper water and accumulation of surfactants within it.

中文翻译：

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波罗的海东南部沿岸涡偶极子的三维结构和动力学：2021年夏季遥感和海洋实验结果

摘要

介绍了波罗的海东南部靠近加里宁格勒地区海岸的两个亚介尺度涡偶极子的准同步卫星和实验现场观测结果。涡偶极子动力学参数，即该过程在海水中的持续时间及其传播速度和方向，以及有利于涡偶极子发生的大气条件，是由连续的高分辨率卫星图像确定的。利用与卫星测量同时获得的声流剖面仪和水文探测器的数据来确定涡偶极子的三维结构特征。讨论了旋涡运动渗透到水柱中的深度，结果表明这种过程并不纯粹是表面现象，而是对 20 m 或更深的深度产生影响。对涡偶极子特定部分内的水流速度和方向的直接测量表明，与位移速度相比，此类地层内部的水动力明显更大。评估偶极子的反气旋部分和气旋部分的差异。水文观测表明，偶极子的活跃气旋部分对周围水域的影响表现为深层水的捕获（上升）和表面活性剂在其中的积累。