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Multiple flow regimes in the Northern Hemisphere winter. I - Methodology and hemispheric regimes. II - Sectorial regimes and preferred transitionsMultivariate pdfs in the phase space of large-scale atmospheric motions are examined in order to identify recurrent and persistent flow patterns. The extent to which intraseasonal variablity can be described and understood in terms of multiple flow regimes is clarified. It is shown that the synoptically intriguing and statistically significant inhomogeneities exhibited by the 2D phase plane on the periphery of the distribution are due to the existence of persistent and recurrent anomaly patterns. It is argued that these inhomgeneities are obscured when PDFs are examined in a smaller-dimensional subspace than dynamically desired. A synoptic characterization of onsets and breaks for the flow regimes is given by compositing. In situ evolutions of anomaly patterns, slow westward shifts of high-latitude anomaly centers, and successive downstream increase of anomaly magnitudes are the typical signatures of such events.
Document ID
19940033556
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kimoto, Masahide
(Japan Meteorological Agency, Meteorological Research Inst. Tsukuba, United States)
Ghil, Michael
(California Univ. Los Angeles, United States)
Date Acquired
August 16, 2013
Publication Date
August 15, 1993
Publication Information
Publication: Journal of the Atmospheric Sciences
Volume: 50
Issue: 16
ISSN: 0022-4928
Subject Category
Meteorology And Climatology
Accession Number
94A10211
Funding Number(s)
CONTRACT_GRANT: NOAA-A90AADMC076
CONTRACT_GRANT: NAG5-713
CONTRACT_GRANT: NSF ATM-90-13217
Distribution Limits
Public
Copyright
Other

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