Equatorial Jets in Decaying Shallow-Water Turbulence on a Rotating Sphere
نویسندگان
چکیده
منابع مشابه
The emergence of jets and vortices in freely evolving, shallow-water turbulence on a sphere
Results from a series of simulations of unforced turbulence evolving within a shallow layer of fluid on a rotating sphere are presented. Simulations show that the turbulent evolution in the spherical domain is strongly dependent on numerical and physical conditions. The independent effects of ~1! ~hyper!dissipation and initial spectrum, ~2! rotation rate, and ~3! Rossby deformation radius are c...
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Coherent jets, such as the Jovian banded winds, are a prominent feature of rotating turbulence. Shallowwater turbulence models capture the essential mechanism of jet formation, which is systematic eddy momentum flux directed up the mean velocity gradient. Understanding how this systematic eddy flux convergence is maintained and how the mean zonal flow and the eddy field mutually adjust to produ...
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The large-scale motions of planetary atmospheres and oceans, constrained by strong stable stratification and rapid rotation, are characterized in part by quasi-two dimensional turbulent motion and in part by coherent structures, such as vortices, zonal jets, and low-frequency waves. These motions are intimately linked and understanding their complex and multiscale interactions presents a comple...
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Rotation modulates turbulence causing columnar structuring of a turbulent flow in case of sufficiently strong rotation. This yields significant changes in the flow characteristics and dispersion properties, which makes rotational turbulence modulation particularly relevant in the context of atmospheric and oceanic flows. Here we investigate the canonical flow of turbulence in a periodic box, su...
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Rotating grid turbulence experiments have been carried out in a stably stratified fluid for relatively large Reynolds numbers (mesh Reynolds numbers up to 18 000). Under the combined effects of rotation and stratification the flow degenerates into quasihorizontal motions. This regime is investigated using a scanning imaging velocimetry technique which provides time-resolved velocity fields in a...
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ژورنال
عنوان ژورنال: Journal of the Atmospheric Sciences
سال: 2007
ISSN: 1520-0469,0022-4928
DOI: 10.1175/jas4015.1