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| Titel |
Isomap nonlinearity analysis and bimodality of the Asian summer monsoon |
| VerfasserIn |
A. Hannachi |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066235
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| Zusammenfassung |
| Isomap nonlinear dimensionality reduction is applied to 1958-2001 ERA-40 SLP
anomalies to study nonlinearity of the Asian summer monsoon intraseasonal
variability. Using a two-dimensional Isomap space, the probability density
function is shown to be bimodal. A bivariate Gaussian mixture model is then
applied to identify the monsoon phases; the obtained regimes represent
respectively the active and break phases. The relationship with the
large-scale seasonal mean monsoon indicates that the frequency of monsoon
regime occurrence is significantly perturbed in agreement with conceptual
ideas. Trend analysis suggests that if the actual trend is to continue then
we may witness a shift toward break conditions over India and more active
conditions over east China. |
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