Impacts of EL NIÑO-Southern oscillation on tropical cyclone activity over the coastal zones of Vietnam

Co Nguyen Thanh; Thuy Hoang Luu Thu; Manh Dinh Van; Thuy Trinh Thi Thu

doi:10.15625/2615-9783/20094

Author affiliations

Authors

Nguyen Thanh Co Institute of Mechanics, Vietnam Academy of Science & Technology, Hanoi, Vietnam
Hoang Luu Thu Thuy Institute of Geography, Vietnam Academy of Science & Technology, Hanoi, Vietnam
Dinh Van Manh VNU University of Engineering and Technology, Hanoi, Vietnam
Trinh Thi Thu Thuy Institute of Mechanics, Vietnam Academy of Science & Technology, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/20094

Keywords:

ENSO, Vietnam coastal zones, Tropical Cyclone, intensity, frequency.

Abstract

The activity of El Niño - Southern Oscillation (ENSO) has been found to alter the characteristics of tropical cyclones (TCs) worldwide. This paper examines how ENSO influences the active time, occurence frequencies, and intensities of TCs over the coastal zones of Vietnam. The study uses Best Track Data in the Western North Pacific region from 1961 to 2020. The wind speed fields of all TCs over the coastal zones are calculated using a semi-empirical model with a square grid of 0.05° resolution. The results show that the frequencies of TCs over the coastal zones decrease during El Niño years, whilethe TC intensities increase significantly compared to those in Neutral years. Meanwhile, TC intensities over all coastal zones during La Niña years, and some coastal zones during El Niño years, decrease significantly compared to those in Neutral years. The magnitudes of both the increase and decrease in TC frequencies and intensities over the coastal zones vary significantly. Moreover, the active time of TCs during La Niña years in some coastal zones is shorter and occurs later than during the Neutral years.

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