Evidence for wind-induced Ekman layer resonance based on rotating tank experiments

被引:3
作者
Vincze, M. [1 ,2 ]
Fenyvesi, N. [2 ]
Klein, M. [3 ]
Sommeria, J. [4 ]
Viboud, S. [4 ]
Ashkenazy, Y. [5 ]
机构
[1] Hungarian Acad Sci, ELTE Theoret Phys Res Grp, Pazmany Peter S 1-A, H-1117 Budapest, Hungary
[2] Eotvos Lorand Univ, von Karman Lab Environm Flows, Pazmany Peter S 1-A, H-1117 Budapest, Hungary
[3] Brandenburg Tech Univ Cottbus, Dept Numer Fluid & Gas Dynam, D-03046 Cottbus, Germany
[4] Univ Grenoble Alpes, LEGI, CNRS, CS 40700, F-38058 Grenoble 9, France
[5] Ben Gurion Univ Negev, Blaustein Inst Desert Res, Dept Solar Energy & Environm Phys, Sede Boger Campus, IL-84990 Sede Boqer, Israel
关键词
NEAR-INERTIAL ENERGY; MOVING STORM; VERTICAL STRUCTURE; OCEAN SURFACE; DEEP-OCEAN; GENERATION; CURRENTS; PROPAGATION; MOTIONS; WAVES;
D O I
10.1209/0295-5075/125/44001
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The temporal variability of wind stress acting on the ocean surface may have a significant impact on the energy transfer between the surface ocean and the abyssal ocean. In particular, the surface ocean layer is expected to deepen when the wind's frequency matches the inertial (Coriolis) frequency, through "Ekman layer resonance". Here, we report on laboratory experiments conducted in the large circular rotating tank of the LEGI Coriolis platform (13 m in diameter and 0.5 m in depth) to investigate the effect of oscillating horizontal shear imposed at the water surface. The analysis of the flow structure by means of particle image velocimetry (PIV) reveals a resonant thickening of the top Ekman layer and a marked increase in the kinetic energy of the flow occurs when the forcing frequency coincides with the Coriolis frequency of the rotating tank. The findings are in agreement with the theoretical expectations and constitute evidence for the existence of the Ekman layer resonance (or near inertial resonance) phenomenon in an ocean-like configuration. Copyright (C) EPLA, 2019.
引用
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页数:7
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