Baroclinic Instability Looking at a three-dimensional current

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Water tank the same tank as experiment no. 3.   Working fluid Salt water (specific gravity matched to the specific gravity of the nylon balls)   Visualization 3mm diameter nylon balls floating neutrally (mid-depth)   Experimental process Using a mirror, the view from above was recorded on the same shot as the view from the side, and the coordinates of the ball at set intervals were read on a television screen.