Abstract
A series of numerical experiments on two-dimensional decaying turbulence are performed for a non-divergent fluid on a rotating sphere, with attention focused on scaling properties of spontaneous circumpolar jets. The numerical calculations show that strong circumpolar westward (retrograde) jets emerge clearly in high latitudes at a large rotation rate Ω . A scaling theory is proposed for the jet width proportional to Ω - 1 / 4 , and the jet strength to Ω 1 / 4 , which agrees well with the numerical results. A noteworthy asymptotic feature is that kinetic energy is entirely concentrated on the circumpolar jets under large rotation rates.
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