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Spin-up flow in a cylinder

Ekman pumping is the process by which a liquid interior spin-up to match a differentially rotating crust. Compressibility and buoyancy act to decrease the penetration of the spin-up flow throughout the interior. Movies show the extent to which regions of the interior are spun-up by Ekman pumping for different values of compressibility K and buoyancy N, where gravity is directed vertically towards the central plane.

• K = 1.0, N = 1.0
• K = 0.1, N = 1.0
• K = 0.3, N = 1.0
• K = 3.0, N = 1.0
• K = 10.0, N = 1.0
• K = 1.0, N = 0.1
• K = 1.0, N = 0.3
• K = 1.0, N = 3.0
• K = 1.0, N = 10.0