What question did this study set out to answer?

To identify persistent, recurrent large-scale flow regimes across the Pacific and Atlantic-Eurasian sectors during Northern Hemisphere winter and examine the dynamical pathways of transition between them.

August 1, 1993Journal of the Atmospheric Sciences

Multiple Flow Regimes in the Northern Hemisphere Winter. Part II: Sectorial Regimes and Preferred Transitions

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Authors

MKMasahide KimotoShinshu University MGMichael GhilCentre National de la Recherche Scientifique

Discussion

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Implication

Observational analysis identifies distinct Pacific and Atlantic winter circulation regimes and preferred transition pathways, suggesting underlying extratropical oscillatory dynamics.

Key Points

To identify persistent, recurrent large-scale flow regimes across the Pacific and Atlantic-Eurasian sectors during Northern Hemisphere winter and examine the dynamical pathways of transition between them.
Analyzed 37 years of daily Northern Hemisphere 700-mb geopotential height anomaly records.
Identified regime patterns using a nonparametric angular probability density function and iterative bump hunting in leading empirical orthogonal function (EOF) phase space.
Modeled inter-regime transitions using a Markov chain and characterized regime onsets and breaks through synoptic compositing.
Classified atmospheric circulation into seven Pacific and six Atlantic-Eurasian distinct persistent flow regimes, including zonal, blocked, and wave train patterns.
Demonstrated that transitions between regimes follow highly favored and disfavored pathways within a Markov chain, separated by transient, unclassifiable states.
Identified characteristic signatures during regime onsets and breaks, including in situ anomaly growth, slow westward shifts in high latitudes, and downstream amplification.

Cite This Study

Kimoto et al. (1993) studied this question.

synapsesocial.com/papers/6a1e7bb940bc8a3dd768f505 https://doi.org/10.1175/1520-0469(1993)050<2645:mfritn>2.0.co;2

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Implication

Observational analysis identifies distinct Pacific and Atlantic winter circulation regimes and preferred transition pathways, suggesting underlying extratropical oscillatory dynamics.

Multiple Flow Regimes in the Northern Hemisphere Winter. Part II: Sectorial Regimes and Preferred Transitions

Discussion

Member takes

Implication

Key Points

Cite This Study

Multiple Flow Regimes in the Northern Hemisphere Winter. Part II: Sectorial Regimes and Preferred Transitions

Discussion

Member takes

Implication

Key Points

Cite This Study

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