ELFT HÍRADÓ

[StatFizSzeminar <statfiz AT glu.elte.hu>]

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                            ELTE TTK Fizikai Intézet
               STATISZTIKUS FIZIKAI SZEMINÁRIUM

                              Extraordinary seminar

                                    June 12th, 2017
                                     Monday, 11.00 

                          ELTE TTK Northern Building, 0.87

                                     Michael Ghil

                   Ecole Normale Supérieure, Paris, and
                   University of California, Los Angeles

                 "The Physics of Climate Sensitivity:
A Tale of Deterministic and Stochastic Dynamical Systems"

The climate system is a nonlinear, heterogeneous and complex
physical system that exhibits variability on many scales of 
time and space. Its dynamical behavior results from a plethora
of physical, chemical and biological processes. Hence, it is 
typically studied across a hierarchy of models, from low-
dimensional systems of ordinary differential equations to infinite-
dimensional systems of partial and functional differential 
equations. The theory of differentiable dynamical systems (DDS) has
provided a road map for climbing this hierarchy and for 
comparing theoretical results with observations.

The climate system is also subject to time-dependent forcing, both
natural and anthropogenic, e.g. solar luminosity variations, volcanic 
eruptions and changing greenhouse gas concentrations. Hence 
increased attention has been paid recently to applications of the theory 
of non-autonomous and random dynamical systems in order to describe
 the way that this complex system changes on time scales comparable 
to a human lifetime and longer. This talk will review the road from 
the classical applications of DDS theory to low-dimensional climate
models with no explicit time dependence to current efforts at applying
non-autonomous and random dynamical systems theory to high-end 
climate models governed by partial and functional differential 
equations, deterministic as well as stochastic.

M. Ghil, 2017: The wind-driven ocean circulation: Applying dynamical systems
theory to a climate problem, Discr. Cont. Dyn. Syst. A, 37(1), 189-228

     1117, Budapest, Pázmány P. sétány 1/A, Északi tömb 
                honlap: http://glu.elte.hu/~statfiz

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