Abstract: The Pacific weather regimes found by Haines and Hannachi from a GCM perpetual January 10-year run, identified as ±Pacific?North American (PNA), are examined for stability both within a model-derived EOF phase space and the ...

Abstract: Sectorial and planetary-scale winter circulation regimes are studied and the relationship between them is investigated in order to find how much the simultaneous occurrence of sectorial regimes contributes to the occurrence ...

Abstract: General circulation models (GCMs) can be used to develop diagnostics for identifying weather regimes. The author has looked for three-dimensional (3D) weather regimes associated with a 10-yr run of the U.K. UGAMP GCM with ...

Abstract: Investigation of preferred structures of planetary wave dynamics is addressed using multivariate Gaussian mixture models. The number of components in the mixture is obtained using order statistics of the mixing proportions, ...

Abstract: A new spectral-based approach is presented to find orthogonal patterns from gridded weather/climate data. The method is based on optimizing the interpolation error variance. The optimally interpolated patterns (OIP) are ...

Abstract: Motivated by the need to understand the nature of the remote atmospheric climate signal associated with El Niño?Southern Oscillation (ENSO), the question is addressed of estimating the nonlinear atmospheric response to ...

Abstract: AbstractConventional analysis methods in weather and climate science (e.g., EOF analysis) exhibit a number of drawbacks including scaling and mixing. These methods focus mostly on the bulk of the probability distribution ...

Abstract: Weather regimes have been sought by examining the 500-mb streamfunction of the UGAMP GCM run for 10 yr at T42 resolution with perpetual January forcing. Five-day low-pass EOFs provide a low-order phase space in which to ...

Abstract: Nonlinearity in the Northern Hemisphere?s wintertime atmospheric flow is investigated from both an intermediate-complexity model of the extratropics and reanalyses. A long simulation is obtained using a three-level ...

Abstract: Seasons are the complex nonlinear response of the physical climate system to regular annual solar forcing. There is no a priori reason why they should remain fixed/invariant from year to year, as is often assumed in climate ...