Zonal flow generation:
the local turbulence view.
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CHM becomes 2D Euler equation in the limit
β
→
0,
k
ρ
→
°
. Hence expect similarities to 2D turbulence.
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Inverse energy cascade and direct cascade of potential
enstrophy (Fj
¯
rtoftÕ53 argument).
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Inverse cascade leads to energy condensation at large scales.
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These are round(ish) vortices in Euler.