The effects of overshooting convection on mixing within the tropical tropical tropopause layer in idealised climate states

Tuesday, 19 April 2016
Plaza Grand Ballroom (The Condado Hilton Plaza)
Hamish A. Ramsay, Monash Univesity, Clayton, Australia; and S. C. Sherwood and M. S. Singh

A series of cloud-resolving simulations are performed to study the impact of spatial/and or temporal inhomogeneity of tropical deep convection, in particular convective overshoots that penetrate into the tropical tropopause layer, on upper tropospheric/lower stratospheric (UTLS) temperature structure and trends under surface warming. Two sets of simulations are studied: one in which the sea surface temperature (SST) is increased uniformly, and a second in which convective updrafts are intensified periodically by introducing an island-like surface with a fixed-diurnal cycle while the surrounding SST is unchanged. All simulations are run to radiative-convective equilibrium so as to capture the mean-state response at larger time scales. We discuss the implications of our results for the interpretation of observed and modelled trends in the UTLS.
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