黑海两层涡旋分解模式中的能量转换

IF 0.7 Q4 OCEANOGRAPHY
A. Pavlushin, N. B. Shapiro, E. N. Mikhailova
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引用次数: 0

摘要

目的。本文旨在对切向风应力作用下黑海大尺度环流在两层涡解析模式框架内的数值模拟实验结果进行能量分析,并确定黑海大尺度环流和中尺度涡形成过程中能量转换的方向和量级。方法与结果。分析是在统计平衡期进行的,在此期间,模型计算的所有特性的平均值随时间保持恒定。根据运动尺度,雷诺兹平均法允许将能量特性(机械能及其转换)分为与大尺度流动有关的和与漩涡有关的。大尺度海流被定义为某一选定时间间隔内的平均流量,与之相偏离的海流被认为是涡旋。分析了能量特性随时间和/或空间的平均值。在统计平衡期间,计算了大尺度流和涡旋对总机械能的贡献,以及能量转换的大小和方向的能量图。构造了同一时期能量分量和参与能量平衡的力的时均场。结论。结果表明,大尺度流动的斜压不稳定性是造成环流曲流的主要原因,并且由于涡流的斜压不稳定性,能量向底层传递。研究表明,大部分风能落在海东,而能量损失发生在盆地的西部和西北部。能量耗散的基本部分是由于摩擦力在上层界面与底部相交区域的下边界上做功而产生的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Energy Transitions in the Two-Layer Eddy-Resolving Model of the Black Sea
Purpose. The present article is aimed to carry out the energy analysis of the numerical experiment results obtained from modeling of the large-scale circulation in the Black Sea within the framework of a two-layer eddy-resolving model under the tangential wind stress forcing, and also to determine directions and magnitudes of the energy transitions accompanying formation of the large-scale flows and mesoscale eddies in the sea. Methods and Results. The analysis is carried out for the period of statistical equilibrium in which the average values of all the characteristics calculated in the model remain constant in time. According to the motion scales, the Reynolds averaging method permits to divide the energy characteristics (mechanical energy and its transitions) into those relating to the large-scale flows and – to the eddies. The large-scale currents are defined as average flows over a certain selected time interval, and the deviations from them are considered to be the vortices. The energy characteristics averaged over time and/or space, are analyzed. For the period of statistical equilibrium, calculated are the energy diagrams showing contribution of the large-scale currents and the vortices to the total mechanical energy, to the magnitudes and directions of energy transitions. The time-averaged fields both of the energy components and the forces involved in the energy balance were constructed for the same period. Conclusions. It is shown that baroclinic instability of a large-scale flow is the main cause of the Rim Current meandering, and the energy is transferred to the bottom layer due to baroclinic instability of the eddies. It has been revealed that a large portion of wind energy falls on the eastern part of the sea, whereas the energy losses take place in the western and northwestern regions of the basin. The basic part of energy dissipation takes place due to the friction forces’ work on the lower boundary of the upper layer in the area where the layer interfaces intersect the bottom.
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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
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