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Titel |
Inversion of the western Pacific subtropical high dynamic model and analysis of dynamic characteristics for its abnormality |
VerfasserIn |
M. Hong, R. Zhang, J. X. Li, J. J. Ge, K. F. Liu |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1023-5809
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Digitales Dokument |
URL |
Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 1 ; Nr. 20, no. 1 (2013-02-18), S.131-142 |
Datensatznummer |
250017735
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Publikation (Nr.) |
copernicus.org/npg-20-131-2013.pdf |
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Zusammenfassung |
Based on time series data of 500 hPa potential field from NCEP/NCAR (National Center for Environmental Forecast of American/National Center for
Atmospheric Research), a novel consideration of empirical orthogonal function (EOF) time–space separation
and dynamic system reconstruction for time series is introduced. This method
consists of two parts: first, the dynamical model inversion and model
parameter optimization are carried out on the EOF time coefficient series
using the genetic algorithm (GA), and, second, a nonlinear dynamic model
representing the subtropical high (SH) activity and its abnormality is
established. The SH activity and its abnormal mechanism is studied using the
developed dynamical model. Results show that the configuration and
diversification of the SH equilibriums have good correspondence with the actual
short–medium term abnormal activity of the SH. Change of SH potential field
brought by the combination of equilibriums is more complex than that by
mutation, and their exhibition patterns are different. The mutation
behavior from high-value to low-value equilibriums of the SH in summer
corresponds with the southward drop of the SH in the observed weather
process. The combination behavior of the two steady equilibriums
corresponds with disappearance of the "double-ridge" phenomenon of the SH.
Dynamical mechanisms of these phenomena are explained. |
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