Systemwide Events Calendar

Atmospheric Sciences Seminar: Dr. Esther Widiasih

October 24, 3:30pm - 4:30pm
Mānoa Campus, Marine Sciences Building, MSB 100

MidPleistocene Transition from Budyko's Energy Balance Model

Dr. Esther Widiasih
Assistant Professor
Department of Mathematics
��Ӱҵ at West Oahu

Seminar Date: Wednesday, October 24, 2018
Refreshments: 3:00pm at MSB lanai
Free Cookies, Coffee & Tea Provided
(Please Bring Your Own Cup)
Seminar Time: 3:30pm
Location: Marine Sciences Building, MSB 100

Abstract:
Energy Balance Models (EBMs) arguably are the simplest form of global climate models. They allow for a deeper mathematical analysis to complement the understanding gained from more complex models. In this talk, I will revisit the long-standing question of which dynamical processes are responsible for the Mid Pleistocene Transition (MPT) in light of a low-order, flip-flop model based on Budyko's EBM. Built upon this EBM is a system of three non-smooth ordinary differential equations (ODEs), which admits glacial cycles and has similar characteristics as the proxy records. Furthermore, it can be shown that when a critical bifurcation parameter of the system is linked to key characteristics of benthic 18O records, the model simulates a realistic MPT. Interestingly, the particular bifurcation parameter is one that controls the relationship between temperature and precipitation.