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| Titel |
Are intraseasonal summer rainfall events micro monsoon-onsets over the western edge of the South-Asian monsoon? |
| VerfasserIn |
Faisal Saeed Syed, Jin Ho Yoo, Heiner Körnlich, Fred Kucharski |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250044694
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| Zusammenfassung |
| A thermodynamic structure leading the active phase (AP) of the Western Edge
of the South-Asian Monsoon (WESAM) is investigated. The APs seems to have
significant contribution in the mean seasonal rainfall in the region. A few
days before APs, the upper level warm anomaly appears over the north HinduKush-
Himalaya (HKH) region and it is reinforced by surface heating yielding the
column average warming. The height anomalies are baroclinic with the low level
anticyclone being located at the east of warming. The low level anticyclone
causes the moisture convergence at the core WESAM region. As the region keeps
warming, the height anomalies and associated low level convergence become
stronger. The AP starts when the low level moisture convergence is strong enough
to overcome the preexisting stable atmospheric condition due to the upper level
warming. The proposed mechanism of APs has some resemblance with large scale south
Asian monsoon onset, whereas conventional south Asian monsoon intraseasonal
oscillations (ISOs) do not show clear relationship with APs of WESAM. |
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