Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session H46: Multi-Scale Flows and Pathways in the Climate System
2:30 PM–5:18 PM,
Tuesday, March 6, 2018
LACC Room: 506
Sponsoring Units: GPC DFD
Chair: Hussein Aluie, Rochester University
Abstract: H46.00010 : Reduced-Order Models for the Large-Scale Atmospheric Turbulence*
5:06 PM–5:18 PM
Identifying the key spatio-temporal characteristics of the large-scale atmospheric turbulence plays an important role in understanding the multi-scale dynamics of the large-scale circulation. In this study, we aim at extracting these key characteristics using data-driven reduced-order modeling techniques. We apply methods that are based on the Fluctuation-Dissipation Theorem, Koopman spectral analysis, and Green’s functions to data from idealized global circulation models and reanalysis to develop a robust and accurate reduced-order modeling framework for the large-scale atmospheric turbulence. We discuss the connections of the extracted spatio-temporal characteristics to those obtained using the conventional empirical orthogonal function analysis. We further demonstrate how the calculated reduced-order models can be used to quantify eddy-mean flow interactions in the large-scale atmospheric circulation by computing the eddy-jet feedback in the extratropical low-frequency variability.
*This work is supported by grants NASA-80NSSC17K0266 and NSF AGS-1552385.
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