Abstract

Boreal Summer Intraseasonal Oscillation Impact on Western North Pacific Typhoons and Rainfall in Taiwan

Highlights

  • The Madden-Julian Oscillation (MJO; Madden and Julian 1971, 1972, 1994) is an eastward moving intraseasonal phenomenon that has broad impacts on weather and climate including precipitation, surface temperature, tropical cyclones, and monsoons (Jones et al 2004; Zhang 2005; Donald et al 2006)

  • The positive typhoon frequency anomalies gradually move northwestward and the typhoon active region shifts into the Taiwan area during phases 3 - 5. These results show that the typhoon activity over the western North Pacific (WNP) is related to the BSISO2 mode and linked with the local rainfall patterns in the Philippines, Taiwan, and Okinawa areas

  • In order to verify the connection among the heavy Taiwan rainfall, the boreal summer intraseasonal oscillation (BSISO) and WNP typhoons, a detailed analysis is provided in the following

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Summary

Introduction

The Madden-Julian Oscillation (MJO; Madden and Julian 1971, 1972, 1994) is an eastward moving intraseasonal phenomenon that has broad impacts on weather and climate including precipitation, surface temperature, tropical cyclones, and monsoons (Jones et al 2004; Zhang 2005; Donald et al 2006). The first two principle components (PCs) from the EOF analysis are used to derive the RMM index (hereafter, the MJO index) This index can represent the boreal winter MJO well, the northward/northwestward propagating variability with the period of intraseasonal time scale during the boreal summer in the Asian summer monsoon region is not fully captured. The contribution from the BSISO2 will be discussed

BSISO2 and the WNP typhoons
BSISO2 and the summer rainfall in Taiwan
Heavy rainfall cases in Taiwan associated with BSISO and WNP typhoons
Findings
Conclusion
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