Abstract
The behaviors of idealized geostrophic and ageostrophic circulations forced by differential heating and parameterized eddy mixing in the absence of boundary drag are examined for a range of mixing values and boundary conditions, using a nonlinear version of Holton's (1986) channel model. It was found that geostrophic and ageostrophic flows can have fundamentally different behaviors. This may have important implications for the circulation and trace gas distributions in the stratosphere. It is shown that, as eddy forcing vanishes, an ageostrophic system is not constrained to approach radiative equilibrium and may tend to the limit of an inviscid diabatic circulation under a range of boundary conditions.
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