Effects of Hallasan Mountain in Jeju Island on Typhoon’s Track and Intensity

Se-Won Do; Il-Ju Moon

doi:10.4217/OPR.2024004

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2024 Vol.46, Issue 1 Preview Page Next Page

Article

Effects of Hallasan Mountain in Jeju Island on Typhoon’s Track and Intensity 태풍의 진로와 강도에 있어 제주도 한라산의 영향

30 March 2024. pp. 1-15

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Abstract

This study examines the influence of Hallasan Mountain (Hallasan) on the track and intensity of two Typhoons, Soulik in 2018 and Chaba in 2016, which passed to the left and right of Hallasan, respectively, using a coupled ocean-atmosphere model. We designed three experiments: one with Hallasan's actual altitude, another with the mountain removed, and a third where Hallasan's altitude was doubled. Results showed that Hallasan had a negligible impact on the tracks of both typhoons. Regarding intensity, however, the central pressure of both typhoons increased (indicating weakening) by up to 2 hPa due to Hallasan; the maximum wind speeds initially increased (Soulik by 1 m/s, Chaba by 3 m/s) and then decreased (Soulik by 1 m/s, Chaba by 5 m/s). These results show that Hallasan does not significantly weaken the intensity of typhoons approaching the Korean Peninsula, but considering the average intensity change (–3.45 hPa) of past typhoons that passed to the left of Jeju Island in terms of central pressure, Hallasan makes a noteworthy contribution. Additionally, this study reveals that changes in typhoon winds due to the wind convergence caused by Hallasan's topography can alter ocean vertical mixing and sea surface cooling, further impacting typhoon intensity. This finding underscores the importance of using a coupled ocean-atmosphere model when studying the impact of topography on typhoons.

Keywords

Hallasan Mountain

typhoon

topographic effect

coupled ocean-atmosphere model

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국문 참고자료의 영문표기 English translation / Romanization of references originally written in Korean

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Information

Publisher :Korea Institute of Ocean Science and Technology
Publisher(Ko) :한국해양과학기술원
Journal Title :Ocean and Polar Research
Journal Title(Ko) :Ocean and Polar Research
Volume : 46
No :1
Pages :1-15
Received Date : 2024-01-10
Revised Date : 2024-02-05
Accepted Date : 2024-02-05
DOI :https://doi.org/10.4217/OPR.2024004

Ocean and Polar Research ISSN:2234-7313(Online) Ocean and Polar Research

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국문 참고자료의 영문표기 English translation / Romanization of references originally written in Korean