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| Titel |
Analysis of the nonlinearity of Asian summer monsoon intraseasonal variability using spherical PDFs |
| VerfasserIn |
Nikola Jajcay, Abdel Hannachi |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084382
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| Zusammenfassung |
| The Asian summer monsoon (ASM) is a high-dimensional and highly complex
phenomenon affecting more than one fifth of the world population. The
intraseasonal component of the ASM undergoes periods of active and break
phases associated respectively with enhanced and reduced rainfall over
the Indian subcontinent and surroundings. In this paper the nonlinear
nature of the intraseasonal monsoon variability is investigated using the
leading EOFs of ERA-40 sea level pressure reanalyses field over the ASM
region. The probability density function is then computed in spherical
coordinates using a Epaneshnikov kernel method. Three significant modes
are identified. They represent respectively (i) East - West mode with
above normal sea level pressure over East China sea and below normal
pressure over Himalayas, (ii) mode with above normal sea level
pressure over East China sea (without compensating centre of opposite sign
as in (i)) and (iii) mode with below normal sea level pressure over
East China sea (same as (ii) but with opposite sign).
Relationship to large scale flow are also investigated and discussed. |
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