What question did this study set out to answer?

This research aims to identify weather regimes in the Pacific using a General Circulation Model (GCM) and explore their dynamical characteristics.

Weather Regimes in the Pacific from a GCM

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Randomized trial examines weather regimes in the Pacific, suggesting fixed points that shape flows.

This research aims to identify weather regimes in the Pacific using a General Circulation Model (GCM) and explore their dynamical characteristics.
Analyzed the 500-mb streamfunction of the UGAMP GCM over a 10-year period at T42 resolution.
Employed five-day low-pass EOFs to study variability and examine pressure patterns in the Northern Hemisphere.
Compared dynamical attracting points with statistical analyses to identify preferred weather patterns.
Identified the PNA pattern as the first EOF, representing 12% variance; increased to 18.5% for Pacific-area-specific EOFs.
Revealed two local minima in the phase space, located around ±PNA regions, suggesting fixed points that promote persistent weather flows.
Statistical analysis corroborated two preferred classes in the ±PNA regions, similar to the dynamical states but closer to climatology.

Haines et al. (1995) studied this question.

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