Decadal change in relationship between western North Pacific tropical cyclone frequency and the tropical Pacific SST

Sang Wook Yeh, Sok Kuh Kang, Ben P. Kirtman, Joo Hong Kim, Min Ho Kwon, Cheol Ho Kim

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

In this study, we examine the relationship between the number of tropical cyclones (TCs) in the western North Pacific and the tropical Pacific sea surface temperature (SST) during the main TC season (July-November) for the period of 1965-2006. Results show that there are periods when TC frequency and the tropical Pacific SST are well correlated and periods when the relationship breaks down. Therefore, decadal variation is readily apparent in the relationship between the TC frequency and the SST variations in the tropical Pacific. We further examine the oceanic and atmospheric states in the two periods (i. e., 1979-1989 vs. 1990-2000) when the marked contrast in the correlation between the TC frequency and the tropical Pacific SST is observed. Before 1990, the analysis indicates that oceanic conditions largely influenced anomalous TC frequency, whereas atmospheric conditions had little impact. After 1990, there the reverse appears to be the case, i. e., atmospheric conditions drive anomalous TC frequency and oceanic conditions are relatively unimportant. A role of atmosphere and ocean in relation to the TC development in the western North Pacific changes, which is consistent with the change of the correlations between the TC frequency and the tropical Pacific SST.

Original languageEnglish (US)
Pages (from-to)179-189
Number of pages11
JournalMeteorology and Atmospheric Physics
Volume106
Issue number3-4
DOIs
StatePublished - Jan 28 2010

ASJC Scopus subject areas

  • Atmospheric Science

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