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A Multiple-Regime Approach to Atmospheric Zonal-Flow Vacillation (2000)
BibTeX
@MISC{Robertson00amultiple-regime,
author = {Andrew W. Robertson and Michael Ghil and J. Atmos Sci and By Seongjoon Koo and Seongjoon Koo},
title = {A Multiple-Regime Approach to Atmospheric Zonal-Flow Vacillation},
year = {2000}
}
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Abstract
Zonal-flow vacillation in an idealized two-layer, global, primitive-equation model is studied in the context of multiple regimes. The spatial structure of vertically and zonally averaged zonal-flow variability resembles that observed in the Southern Hemisphere, with dipolar anomalies centered at 40 o and 60 o . The probability density function (PDF) of the model's zonal flow is studied in the subspace of its two leading principal components. The PDF exhibits multiple regimes consisting of a pronounced central peak with two distinct shoulders attached to it. All three features are statistically significant at the 95% confidence level against the null hypothesis of a two-dimensional Markov process of order one. Flow composites for the two shoulders show meteorologically significant differences from climatology and similarities with observed Southern Hemisphere flow patterns. In the low-latitude regime the narrow jet's maximum lies equatorward of the climatological mean position, whi...
Keyphrases
atmospheric zonal-flow vacillation multiple-regime approach multiple regime significant difference climatological mean position spatial structure dipolar anomaly zonal flow pronounced central peak probability density function idealized two-layer distinct shoulder observed southern hemisphere flow pattern narrow jet zonal-flow variability resembles primitive-equation model confidence level two-dimensional markov process null hypothesis low-latitude regime leading principal component southern hemisphere zonal-flow vacillation
