[ACG34-P05] Global Climatology of Baroclinicity and its Variations: Role or Air-Sea Interactions
Keywords:Atmosphere, Ocean, Sea Surface Temperature and Fronts
We present a global climatology of baroclinicity for summer and winter, measured by the slope of isentropic surfaces. As expected, the storm tracks are clearly visible in the mean baroclinicity, as well as their seasonal progression. Furthermore, the previously claimed self-maintenance of storm tracks is confirmed, with the diabatic tendencies balancing the adiabatic tendencies in the time mean, where the diabatic tendencies are mostly associated with extratropical cyclones and act to increase baroclinicity. In addition, we highlight certain differences between the Atlantic and Pacific storm tracks in terms of their maintenance by the aforementioned processes. We also contrast the two main storm tracks in the Northern Hemisphere to the storm track in the Southern Hemisphere. We will also shed light on the potential role of sea surface temperature and fronts and land-sea contrasts in this framework for baroclinicity.