Moist Convection Schemes on the Responses of Tropical Cyclone Intensity and Structure to Local Surface Coolings

In this study, the Geophysical Fluid Dynamics Laboratory/NOAA hurricane model is used to investigate the responses of tropical cyclone to local surface coolings with different moist convection schemes. The moist convection schemes selected are of different emphasis on the role of local surface fluxes and large-scale moisture convergence in producing and maintaining deep moist convections. We first compare the scheme-caused difference in the effects of idealized axisymmetric local surface flux reductions, which bears similarities to a stationary tropical cyclone on a f-plane, focusing on the possible hurricane structure/size and intensity differences. Detailed analysis of the environmental state and the surface inflow layer is done to see the possible mechanisms for the differences. We then, with the different schemes, investigate the effects of some asymmetric realistic local surface coolings, such as those with tropical cyclone-ocean interaction, tropical cyclone-land surface water interaction, and rainfall feedbacks over land. The results will be reported at the meeting.