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Research Article. On memory, dimension, and atmospheric teleconnections by Terence. J. O’Kane; Didier P. Monselesan; James S. Risbey; Illia Horenko; Christian L. E. Franzke is a scholarly article available to read on EtoBox.

What is Research Article. On memory, dimension, and atmospheric teleconnections about?

Using reanalysed atmospheric data and applying a data-driven multiscale approximation to nonstationary dynamical processes, we undertake a systematic examination of the role of memory and dimensionality in de ning the quasi-stationary states of the troposphere over the recent decades. We focus on the role of teleconnections characterised by either zonally-oriented wave trains or meridional dipolar structures. We consider the impact of various strategies for dimension reduction based on principal component analysis, diagonalization and truncation. We include the impact of memory by consideration of Bernoulli, Markovian and non-Markovian processes. We a priori explicitly separate barotropic and baroclinic processes and then implement a comprehensive sensitivity analysis to the number and type of retained modes. Our results show the importance of explicitly mitigating the deleterious impacts of signal degradation through ill-conditioning and under sampling in preference to simple strategies based on thresholds in terms of explained variance. In both hemispheres, the results obtained for the dominant tropospheric modes depend critically on the extent to which the higher order modes are

Author

Terence. J. O’Kane; Didier P. Monselesan; James S. Risbey; Illia Horenko; Christian L. E. Franzke

Publisher

Portico

Published

2017

Language

EN