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Inter-decadal shift of the prevailing tropical cyclone tracks over the western North Pacific and its mechanism study

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Abstract

On the basis of observations and results from the combination of a statistical formation model and a trajectory model, the inter-decadal shift of prevailing TC tracks in the western North Pacific (WNP) are examined. The contributions of the changes in large-scale steering flows and tropical cyclone (TC) formation locations to the observed inter-decadal shift are investigated and their relative importance is determined. This study focuses on two periods, 1965–1986 (ID1) and 1987–2010 (ID2), which are determined based on the abrupt change of the annual category 4 and 5 TC frequency derived from the Bayesian change-point detection analysis. It is found that the models can well simulate the primary features of prevailing TC tracks on the inter-decadal timescale. From ID1 to ID2, a significant decrease in the frequency of TC occurrences is observed over the central South China Sea and well simulated by the models. Areas with a remarkable increase in the TC frequency, which extends from the Philippine Sea to the eastern coast of China and in the west of the WNP basin, are also reasonably simulated. Above changes in the prevailing TC tracks are attributed to (1) intensified cyclonic circulation centered over the western part of China and (2) more westward-southward expansion and intensification of the subtropical high over the WNP. Further analysis reveals that the inter-decadal shift in prevailing TC tracks is mainly resulted from the combined effects of changes in large-scale steering flows and TC formation locations. Although both contribute to the inter-decadal shift in the prevailing TC tracks, changes in large-scale steering flows play a more important role compared to changes in TC formation locations.

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Acknowledgments

The author thanks Dr. Liguang Wu and Dr. Pao-Shin Chu for valuable comments on the earlier version of this manuscript. This research was jointly supported by the National Natural Science Foundation of China (41305050), the Natural Science Foundation of China (41275093), the National Natural Science Foundation of China (41375098), the foundation of Key Laboratory of Meteorological Disaster of Ministry of Education (KLME1204) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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  1. Pacific Typhoon Research Center, Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Haikun Zhao & Liguang Wu

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  1. Haikun Zhao
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Correspondence to Haikun Zhao.

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Responsible editor: C. Simmer.

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Zhao, H., Wu, L. Inter-decadal shift of the prevailing tropical cyclone tracks over the western North Pacific and its mechanism study. Meteorol Atmos Phys 125, 89–101 (2014). https://doi.org/10.1007/s00703-014-0322-8

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