[세미나] Dr. Bidyut Bikash Goswami

Beyond the shallow water equation: Convective parameterization … and beyond.

Dr. Bidyut Bikash Goswami (New York University Abu Dhabi)

2019년 2월 13일 (수) 15:00

과학관 553호

Abstract

Beyond the shallow water equation: Convective parameterization … and beyond.

Earth’s atmosphere is nothing but fluid and the Navier-Stokes equations simplified for a shallow water system is good enough to understand the large scale features of it. However, to represent and simulate the behavior of the small scale disturbances of the atmosphere hiding behind the approximations while deriving the shallow water equations, we need convective parameterization. The fact that the biases due to inappropriate representation of the small scale disturbances can grow and eventually contaminate the large scale atmospheric circulations makes the issue of convective parameterization even more crucial. Convective parameterization has been a long standing issue in simulating the global climate. Traditionally based on the quasi equilibrium assumption, it has evolved beyond the traditional approach in recent times. Two such approaches are super-parameterization (SP) and stochastic multi-cloud model (SMCM) approach. In this seminar, I shall talk on why we need convective parameterization, problems of traditional convective parameterization approaches and the need for approaches like SP and SMCM and see some of the results from climate simulations made using SP and SMCM.