We are thankful to be welcome on these lands in friendship. The lands we are situated on are covered by the Williams Treaties and are the traditional territory of the Mississaugas, a branch of the greater Anishinaabeg Nation, including Algonquin, Ojibway, Odawa and Pottawatomi. These lands remain home to many Indigenous nations and peoples.

We acknowledge this land out of respect for the Indigenous nations who have cared for Turtle Island, also called North America, from before the arrival of settler peoples until this day. Most importantly, we acknowledge that the history of these lands has been tainted by poor treatment and a lack of friendship with the First Nations who call them home.

This history is something we are all affected by because we are all treaty people in Canada. We all have a shared history to reflect on, and each of us is affected by this history in different ways. Our past defines our present, but if we move forward as friends and allies, then it does not have to define our future.

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February 28, 2013

Speaker: Greg Lewis, Ontario Tech University

Title: A Dynamical Systems Approach to Geophysical Fluid Dynamics

Abstract: Geophysical Fluid Dynamics is the study of fluid systems for which rotation and differential heating play a dominant role. Examples of geophysical fluids include the Earth’s atmosphere and ocean. Such fluids exhibit complex nonlinear behaviour that is not well understood. In principle, bifurcation analysis can be used to gain insight into the nature of these complex dynamics. However, the models describing geophysical fluid flow are systems of nonlinear PDEs, based on the Navier-Stokes equations, and usually do not offer the possibility of fully analytical analysis. Furthermore, the most common numerical bifurcation techniques are designed for low-dimensional systems, and therefore are inappropriate in this context. In this talk, I will discuss some of the interesting nonlinear phenomena that have been observed in various geophysical fluid systems, and discuss the analytical and special numerical methods for large-dimensional systems that have been used to study them.