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We investigate how the meridional circulation and baroclinic eddies changewith insolation and rotation rate, under high and zero obliquity setups, usinga general circulation model. The total circulation is considered assuperposition of circulations driven by different physics processes, such asdiabatic and adiabatic processes. We decompose the meridional circulation intodiabatic and adiabatic components, in order to understand their differentresponses to changes of insolation and rotation rate. As insolation or rotationperiod increases, the meridional circulation tends to become more diabaticallydominant, regardless of the obliquity. The low obliquity circulation is alwaysdominated by diabatic processes, while the high obliquity configuration has twocirculation regimes: an adiabatic-dominant regime in the limit of lowinsolation and fast rotation, and a diabatic-dominant regime in the oppositelimit. This regime transition may be observable via its signature on the upperatmospheric zonal wind and the column cloud cover. The momentum-drivencirculation, the dominant circulation component in the weak-insolation andfast-rotating regimes is found to resemble that in a dry dynamic model forcedby a reversed meridional temperature gradient, indicating the relevance ofusing a dry dynamic model to understand planetary general circulations underhigh obliquity.

Regime transition between eddy-driven and moist-driven circulation on High Obliquity Planets