Different impacts of two kinds of Pacific Ocean warming on tropical cyclone frequency over the western North Pacific

The present study examines the relationship of ENSO Modoki and canonical ENSO, respectively, with the tropical cyclone (TC) frequency over the western North Pacific (WNP) for the period 1960–2008. The TC frequency is significantly positively correlated with ENSO Modoki index. The Niño‐3 index has a...

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Bibliographic Details
Published in:Geophysical research letters 2010-01, Vol.37 (1), p.n/a
Main Authors: Chen, Guanghua, Tam, Chi-Yung
Format: Article
Language:English
Subjects:
Anomalies
Atmospheric sciences
Circulation
Climate change
Climate science
Correlation
Cyclones
Earth
Earth sciences
Earth, ocean, space
El Nino
Exact sciences and technology
Geobiology
Heating
Marine
Modulation
Ocean warming
Pacific Ocean
tropical cyclone frequency
Tropical cyclones
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Summary:The present study examines the relationship of ENSO Modoki and canonical ENSO, respectively, with the tropical cyclone (TC) frequency over the western North Pacific (WNP) for the period 1960–2008. The TC frequency is significantly positively correlated with ENSO Modoki index. The Niño‐3 index has a markedly negative (positive) correlation with the TC frequency in the northern (southeastern) portion of the WNP. In response to heating source related to El Niño Modoki, a large‐scale cyclonic anomaly forms over the WNP. In contrast, during the canonical El Niño years, zonally‐elongated heating source and sink exhibit a meridional dipole pattern, which induces an anticyclonic anomaly in the subtropics and a cyclonic anomaly near the equatorial central Pacific. Numerical experiments under the realistic mean state and heating profiles validate that the anomalous circulation responses to heating play essential roles in different modulations of two kinds of Pacific Ocean warming on the TC frequency.
ISSN:0094-8276
1944-8007
DOI:10.1029/2009GL041708