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DOI	10.1016/j.dynatmoce.2019.03.005
	Generation of oceanic internal gravity waves by a cyclonic surface stress disturbance
	Voelker G.S.; Myers P.G.; Walter M.; Sutherland B.R.
发表日期	2019
ISSN	03770265
起始页码	116
结束页码	133
卷号	86
英文摘要	Atmospheric cyclones with strong winds significantly impact ocean circulation, regional sea surface temperature, and deep water formation across the global oceans. Thus they are expected to play a key role in a variety of energy transport mechanisms. Even though wind-generated internal gravity waves are thought to contribute significantly to the energy balance of the deep ocean, their excitation mechanisms are only partly understood. The present study investigates the generation of internal gravity waves during a geostrophic adjustment process in a Boussinesq model with axisymmetric geometry. The atmospheric disturbance is set by an idealized pulse of cyclonic wind stress with a Rankine vortex structure. Strength, radius and duration of the forcing are varied. The effect upon wave generation of stratification with variable mixed-layer depth is also examined. Results indicate that internal gravity waves are generated after approximately one inertial period. The outward radial energy flux is dominated by waves having structure close to vertical mode-1 and with frequency close to the inertial frequency. Less energetic higher mode waves are observed to be generated close to the sea floor underneath the storm. The total radiated energy corresponds to approximately 0.02% of the wind input. Deeper mixed-layer conditions as well as weaker stratification reduce this fraction. The low energy transfer rates suggest that other processes that drive vertical motion like surface heat fluxes, turbulent motion, mixed region collapse and storm translation are essential for significant energy extraction by internal gravity waves to occur. © 2019 The Authors
英文关键词	Air-sea coupling; Boussinesq approximation; Geostrophic adjustment; Internal gravity waves; Ocean modeling
语种	英语
scopus关键词	Atmospheric structure; Energy transfer; Gravity waves; Heat flux; Oceanography; Storms; Surface properties; Surface waters; Water waves; Air-sea coupling; Boussinesq approximations; Geostrophic adjustment; Internal gravity waves; Ocean model; Coastal engineering; atmosphere-ocean coupling; Boussinesq equation; cyclone; energy balance; geostrophic flow; gravity wave; internal wave; ocean wave; stratification; wave generation; wind stress
来源期刊	Dynamics of Atmospheres and Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178374
作者单位	MARUM – Center for Marine Environmental Sciences, University of Bremen, Germany; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada; Department of Physics, University of Alberta, Edmonton, Alberta, Canada
推荐引用方式 GB/T 7714	Voelker G.S.,Myers P.G.,Walter M.,et al. Generation of oceanic internal gravity waves by a cyclonic surface stress disturbance[J],2019,86.
APA	Voelker G.S.,Myers P.G.,Walter M.,&Sutherland B.R..(2019).Generation of oceanic internal gravity waves by a cyclonic surface stress disturbance.Dynamics of Atmospheres and Oceans,86.
MLA	Voelker G.S.,et al."Generation of oceanic internal gravity waves by a cyclonic surface stress disturbance".Dynamics of Atmospheres and Oceans 86(2019).