期刊
JOURNAL OF MARINE SYSTEMS
卷 89, 期 1, 页码 30-47出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmarsys.2011.07.009
关键词
Aegean; Mixing; Turbulence; Scattering; Hydraulic jump
资金
- U.S. Office of Naval Research
Intensive microstructure sampling over the southern slope of the Cycladic Plateau found very weak mixing in the pycnocline, centered on a thin minimum of diapycnal diffusivity with K(rho) = 1.5 x 10(-6) m(2) s(-1), Below the pycnocline, K(rho) increased exponentially in the bottom 200 m, reaching 1 x 10(-4) m(2) s(-1) a few meters above the bottom. Near-bottom mixing was most intense where the bottom slope equaled the characteristic slope of the semi-diurnal internal tide. This suggests internal wave scattering and/or generation at the bottom, a conclusion supported by near-bottom dissipation rates increasing following rising winds and with intensifying internal waves. Several pinnacles on the slope were local mixing hotspots. Signatures included a vertical line of strong mixing in a pinnacle's wake, an hydraulic jump or lee wave over a downstream side of the summit, and a 'beam' sloping upward at the near-inertial characteristic slope. Because dissipation rate averages were dominated by strong turbulence. epsilon/nu N(2)> 100, the effect on K(rho) of alternate mixing efficiencies proposed for this range of turbulent intensity is explored. (C) 2011 Elsevier B.V. All rights reserved.
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