E-122 傾圧波動と安定成層の間の相互作用の実験的観測

概要

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A radial temperature difference is imposed on the water near a flat bottom of a rotating annulus to produce a baroclinic lower layer and the water surface is heated to create a stable upper layer. Sufficiently stable stratification is necessary for steady flows to emerge in the lower layer. Upward fluid motions make the baroclinic flow permeate into the upper layer. The stable stratification, however, suppresses the upward motions so that the zonal fluid velocity decreases with height. In fact, its maximum appears at the top level of the baroclinic lower layer. According to the thermal wind balance, then the sign of the radial temperature gradient changes there so that it is warmer on the inner side of the annulus in the upper layer. A meridional fluid eirculation mixing both layers reflects this virtual temperature structure. In the upper layer, there exists a critical level below and above which wave flows have a phase shift of a half wavelength and opposite jets directions.
日本流体力学会の論文
2003-07-28