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| Titel |
Mesoscale processes for super heavy rainfall of Typhoon Morakot (2009) over Southern Taiwan |
| VerfasserIn |
C.-Y. Lin, H.-M. Hsu, Y.-F. Sheng, C.-H. Kuo, Y.-A. Liou |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 1 ; Nr. 11, no. 1 (2011-01-14), S.345-361 |
| Datensatznummer |
250009074
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| Publikation (Nr.) |
 copernicus.org/acp-11-345-2011.pdf |
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| Zusammenfassung |
| Within 100 h, a record-breaking rainfall, 2855 mm, was brought to Taiwan
by typhoon Morakot in August 2009 resulting in devastating landslides and
casualties. Analyses and simulations show that under favorable large-scale
situations, this unprecedented precipitation was caused first by the
convergence of the southerly component of the pre-existing strong
southwesterly monsoonal flow and the northerly component of the typhoon
circulation. Then the westerly component of southwesterly flow pushed the
highly moist air (mean specific humidity >16 g/kg between 950 and 700 hPa
from NCEP GFS data set) eastward against the Central Mountain Range, and
forced it to lift in the preferred area. From the fine-scale numerical
simulation, not only did the convergence itself provide the source of the
heavy rainfall when it interacted with the topography, but also convective
cells existed within the typhoon's main rainband. The convective cells were
in the form of small rainbands perpendicular to the main one, and propagated
as wave trains downwind. As the main rainband moved northward and reached
the southern CMR, convective cells inside the narrow convergence zone to the
south and those to the north as wave trains, both rained heavily as they
were lifted by the west-facing mountain slopes. Those mesoscale processes
were responsible for the unprecedented heavy rainfall total that accompanied
this typhoon. |
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