Volume 2016, Issue 1 5829162
Research Article
Open Access

Latitudinal Change of Tropical Cyclone Maximum Intensity in the Western North Pacific

Jae-Won Choi

Jae-Won Choi

National Institute of Meteorological Research, Jeju, Republic of Korea nimr.go.kr

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Yumi Cha

Yumi Cha

National Typhoon Center, Korea Meteorological Administration, Jeju, Republic of Korea kma.go.kr

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Hae-Dong Kim

Corresponding Author

Hae-Dong Kim

Department of Global Environment, Keimyung University, Daegu, Republic of Korea kmu.ac.kr

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Sung-Dae Kang

Sung-Dae Kang

Green Simulation, Co., Ltd., SK HUB-SKY, 1523 Jungangdae-ro, Dongrae-gu, 102-3004 Busan, Republic of Korea

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First published: 24 December 2015
Citations: 13
Academic Editor: Xiaofeng Li

Abstract

This study obtained the latitude where tropical cyclones (TCs) show maximum intensity and applied statistical change-point analysis on the time series data of the average annual values. The analysis results found that the latitude of the TC maximum intensity increased from 1999. To investigate the reason behind this phenomenon, the difference of the average latitude between 1999 and 2013 and the average between 1977 and 1998 was analyzed. In a difference of 500 hPa streamline between the two periods, anomalous anticyclonic circulations were strong in 30°–50°N, while anomalous monsoon trough was located in the north of South China Sea. This anomalous monsoon trough was extended eastward to 145°E. Middle-latitude region in East Asia is affected by the anomalous southeasterlies due to these anomalous anticyclonic circulations and anomalous monsoon trough. These anomalous southeasterlies play a role of anomalous steering flows that make the TCs heading toward region in East Asia middle latitude. As a result, TCs during 1999–2013 had higher latitude of the maximum intensity compared to the TCs during 1977–1998.

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