Systematic metastable atmospheric regime identification in an AGCM

In this study we apply a recently developed clustering method for the systematic identification of metastable atmospheric regimes in high-dimensional data sets generated by atmospheric models. The novelty of this approach is that it decomposes the phase space in, possibly, over-lapping clusters and simultaneously estimates the most likely switching sequence amongst the clusters. The parameters of the clustering and switching are estimated by a Finite Element approach. The switching amongst the clusters can be described by a Markov transition matrix. Possible metastable regime behavior is assessed by inspecting the eigenspectrum of the associated transition probability matrix. Here we apply the recently introduced metastable data-analysis method to high-dimensional data sets produced by a barotropic model and a comprehensive atmospheric General Circulation Model (GCM). We are able to successfully identify significant and dynamically relevant metastable regimes in both models. The metastable regimes in the barotropic model correspond to blocked and zonal states. Similar regime states were already previously identified in highly reduced phase spaces of just one- and two-dimensions in the same model. Next the clustering method is applied to a comprehensive atmospheric GCM where 7 significant flow regimes are identified. The spatial structures of the regimes correspond amongst others to both phases of the Northern Annular Mode and Pacific blocking. The regimes are maintained predominantly by transient eddy fluxes of low-pass filtered anomalies. It is demonstrated how the dynamical description of the slow process switching between the regimes can be acquired from the analysis results and an investigation of the resulting simplified dynamical model with respect to predictability is performed. A predictability study shows that a simple Markov model is able to predict the regimes up to 6 days ahead, which is comparable to the ability of high resolution state-of-the-art numerical weather prediction models to accurately predict the onset and decay of blockings. The implications of our results for the derivation of reduced models for extended-range predictability are discussed.

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