Impacts of Central Pacific and Eastern Pacific El Niños on tropical cyclone tracks over the western North Pacific.

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Title:	Impacts of Central Pacific and Eastern Pacific El Niños on tropical cyclone tracks over the western North Pacific.
Authors:	洪志誠;Chi-Cherng Hong;Yuan-Hsing Li;Tim Li;Ming-Ying Lee
Contributors:	地球環境暨生物資源學系(含環境教育與資源碩士班)
Keywords:	central Pacific El Niño;eastern Pacific El Niño;tropical cyclone (TC) tracks
Date:	2011-08
Issue Date:	2014-01-17 19:30:19 (UTC+8)
Abstract:	This study examines the different impacts of two types of El Niños, the eastern Pacific El Niño (EP-EN) and the central Pacific El Niño (CP-EN), on tropical cyclone (TC) tracks over the western North Pacific (WNP) based on observational data. Whereas TC tracks between CP-EN and EP-EN show a small difference in boreal summer (JJA), they do exhibit a great difference in boreal autumn (SON), that is, TCs recurve northward at a further westward location near the coastline of East Asia during CP-EN. As a consequence, more TCs make landfall to Taiwan and South China during CP-EN. A further observational analysis indicates that the westward shift of the subtropical high and associated steering flow during CP-EN is a key factor that causes the difference in the TC tracks in autumn. Numerical experiments further suggest that the difference of local SST in the WNP between CP-EN and EP-EN accounts for the distinctive differences in the local Hadley circulation, the subtropical high and the TC steering flow.
Relation:	Geophysical Research Letters，Vol. 38, Issue 16，Pages L16712
Appears in Collections:	[Department of Earth and Life Science] Periodical Articles

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