Atmosphere Ocean Science Friday Seminar

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(WZ) A simplified entrainment model based on shallow water equation and (CP) Acceleration and Deceleration of tropical cyclogenesis in idealized simulations

Speaker: Wenjun Zhao and Chaohao Pan, PhD Candidates, Courant Institute

Location: Warren Weaver Hall 1314

Date: Friday, November 9, 2018, 3:45 p.m.

Synopsis:

Wenjun:

A simplified entrainment model based on shallow water equation

In the 30-minute talk, I will introduce a simple ocean mixing model based on 1D two-layer shallow water equations and its numerical realization, which is the motivation of an ongoing project in the interdisciplinary of ocean dynamics and machine learning.

 

Chaohao:

Acceleration and Deceleration of tropical cyclogenesis in idealized simulations

In an idealized cloud resolving model, generation of tropical cyclones is observed under the condition of Rotational Radiative Convective Equilibrium (RRCE). From initially homogeneous environment with minor random noise, convection aggregates spontaneously in approximately 3 weeks, and then develops into a hurricane. During this process, feedbacks related to surface flux exchange, in particular Wind Induced Surface Heat Exchange (WISHE), is believed to play a significant role. To verify this role, the surface flux feedback is turned off in the simulation, and the cyclogenesis progress indeed slows down. After 50 days of run, instead of a mature hurricane, two weak low pressure areas occur in the domain. From this point, what will happen if the simulation is restarted with the surface flux feedback turned back on? Will the tropical cyclogenesis be accelerated or not? We will discuss these during the talk.