Yft fnfn t vtyn

Fig. 13. Same as Fig. 10 but for northward track type from October to January.

M < < \ WWVsNJ»" ■-"ss f r y \ \

10m/s

10m/s

Fig. 13. Same as Fig. 10 but for northward track type from October to January.

The wind fields display the corresponding circulation flow and potential effective local weather systems. In this study, the West Pacific Subtropical High of winter-time may be the critical modulator of TC tracks in this region, specifically during post-winter-monsoon period. Moreover, such strong weather system is associated with Northeast Trade Wind and East Asia Winter Monsoon. How westward this system extends is partly result in whether TC in BOB moves westward or not. Thus, mechanism and causal relationship between the West Pacific Subtropical High as well as possible modulated systems will be investigated in the future.

4. Acknowledgments

This research was supported by National 973 projects (No. 2011CB403505), the Natural Science Foundation of China (Grants U0733002), Natural Science Foundation Guangdong, China (Team Research Project 8351030101000002), and the Postdoctoral Fund of China (No. 20090450911).

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