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Comparison of velocity shear with Turbulence Reduction Driven by Biasing in a Simple Cylindrical Slab Plasma

Plasma Science and Technology 2010年第4期12卷 391-396页

作者： K.W.GENTLE K.LIAO K.LEE W.L.ROWAN Institute of Fusion Studies University of Texas at Austin

In an experimental realization of the sheared cylindrical slab, the level of plasma turbulence is strongly reduced by application of a sufficient bias potential difference in the radial direction. Density fluctuation levels △nrms/n decrease by more than a factor of five. The ion flow velocity profile is measured spectroscopically from the Doppler shift of an argon ion line. Comparison of the shearing rates with the turbulent amplitudes as a function of bias show no relation between the shearing rate and turbulence reduction, contrary to expectations.

关键词： turbulence suppression shear stabilization velocity shear bias

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Eddy generation and evolution in the North Pacific Subtropical Countercurrent(NPSC) zone

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Chinese Journal of Oceanology and Limnology 2010年第5期28卷 968-973页

作者：康霖王凡陈永利 Institute of Oceanology Chinese Academy of Sciences Key Laboratory of Circulation and Waves Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

The seasonal generation and evolution of eddies in the region of the North Pacific Subtropical Countercurrent remain poorly understood due to the scarcity of available *** used TOPEX/POSEIDON altimetry data from 1992 to 2007 to study the eddy field in this *** found that velocity shear between this region and the neighboring North Equatorial Current contributes greatly to the eddy ***,the eddy kinetic energy level(EKE) shows an annual cycle,maximum in April/May and minimum in December/*** of the temporal and spatial distributions of the eddy field revealed clearly that the velocity shear closely related to baroclinic instability *** eddy field seems to be more zonal than meridional,and the energy containing length scale shows a surprising lag of 2-3 months in comparison with the 1-D and 2-D EKE level.A similar phenomenon is observed in individual eddies in this *** results show that in this eddy field band,the velocity shear may drive the EKE level change so that the eddy field takes another 2-3 months to grow and interact to reach a relatively stable *** explains the seasonal evolution of identifiable eddies.

关键词： TOPEX/POSEIDON altimetry eddy field EKE velocity shear North Pacific SubtropicalCountercurrent

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