Impacts of central Pacific and eastern Pacific El Niños on tropical cyclone tracks over the western North Pacific

Details Impacts of central Pacific and eastern Pacific El Niños on tropical cyclone tracks over the western North Pacific Impacts of central Pacific and eastern Pacific El Niños on tropical cyclone tracks over the western North Pacific

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3816712h&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 16, CiteID L16712

Physics

Atmospheric Processes: Tropical Cyclones, Atmospheric Processes: Tropical Meteorology, Paleoceanography: El Nino (4522)

Scientific paper

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.

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