Atmosphere Ocean Science Friday Seminar

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Characterizing the Quasi-Biennial Oscillation using Koopman Operator Theory

Speaker: Claire Valva, CAOS

Location: Warren Weaver Hall 1314

Date: Friday, November 5, 2021, 4 p.m.

Notes:

The quasi-biennial oscillation (QBO) is the leading driver of variability of the equatorial stratosphere; it is seen as downward propagating easterly and westerly wind regimes and has a variable period of approximately 28 months. The QBO affects lower stratospheric tropical temperature and water vapor, and is one of the main sources of external variability in the polar stratosphere. It is also thought to influence variability in the troposphere though teleconnections.

I will briefly go over some Koopman operator theory and discuss the spectral decomposition of these operators as an approach for coherent feature extraction in dynamical systems. I will present preliminary results using evolution operator theory to detect and characterize the QBO.