8.1 Feedbacks on ITCZ migrations from atmosphere-ocean coupling

Wednesday, 28 June 2017: 10:30 AM
Salon F (Marriott Portland Downtown Waterfront)
Tapio Schneider, California Institute of Technology, Pasadena, CA

It is now well established that the remote changes in the atmosphere energy balance can affect the position of the ITCZ. For example, high-latitude warming or cooling in one hemisphere generally shifts the ITCZ into the differentially warming hemisphere. It is also well-established that the wind-driven ocean circulation in low latitudes, which dominates the oceanic energy transport, is tightly coupled to the atmospheric Hadley cells through Ekman balance. Here I discuss implications of this coupling for ITCZ migrations. Theoretical arguments (Schneider et al. 2014) show that the atmosphere-ocean coupling generally dampens ITCZ migrations. Further developments of these arguments indicate how strong this oceanic damping is and how it depends on the climate state.
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