Role of submonthly disturbance and 40-50-day ISO on the extreme rainfall event associated with Typhoon Morakot (2009) in Southern Taiwan.

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Title:	Role of submonthly disturbance and 40-50-day ISO on the extreme rainfall event associated with Typhoon Morakot (2009) in Southern Taiwan.
Authors:	洪志誠;Chi-Cherng Hong;Ming-Ying Lee;Huang-Hsiung Hsu;Jui-Ling Kuo
Contributors:	地球環境暨生物資源學系(含環境教育與資源碩士班)
Keywords:	Typhoon;submonthly disturbancce;submonthly wave pattern;40-50-day ISO;topographic lifting effect
Date:	2010-04
Issue Date:	2014-01-17 19:30:27 (UTC+8)
Abstract:	Typhoon Morakot that made landfall on Taiwan during 7–9 August 2009 caused record-breaking rainfall in Southern Taiwan and nearly 700 deaths from mudslides. It was the most severe natural disaster in Southern Taiwan caused by a typhoon in 50 years. Different from typical typhoon cases, characterized by an isolated vortex, Typhoon Morakot was embedded in a large-scale convection region with monsoon circulation of different time scales in the tropical western North Pacific. Morakot's landing on Taiwan occurred concurrently with the arrival of a large-scale cyclonic circulation in a submonthly wave pattern (10–30-day) during the cyclonic phase of the 40–50-day intraseasonal oscillation. It is suggested that the abundant moisture supply from the southwesterly embedded in the multiscale large-scale circulation and the topographic lifting effect of steep terrain resulted in the record-breaking rainfall in Southern Taiwan.
Relation:	Geophysical Research Letters，Vol. 37, Issue 8，Pages L08805
Appears in Collections:	[Department of Earth and Life Science] Periodical Articles

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