Extreme Sea Level Variations in the Sea of Japan Caused by the Passage of Typhoons Maysak and Haishen in September 2020
- Authors: Smirnova D.A.1,2, Medvedev I.P.2
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Affiliations:
- Lomonosov Moscow State University
- Shirshov Institute of Oceanology, Russian Academy of Sciences
- Issue: Vol 63, No 5 (2023)
- Pages: 718-732
- Section: Физика моря
- URL: https://journals.rcsi.science/0030-1574/article/view/140441
- DOI: https://doi.org/10.31857/S0030157423050179
- EDN: https://elibrary.ru/VCYZBI
- ID: 140441
Cite item
Abstract
This study investigates extreme sea level variations recorded by tide gauges in the Sea of Japan during the passages of typhoons Maysak and Haishen in September 2020. Specific focus is on storm surges, seiches and infragravity waves identified in the records using tidal and statistical analyses. At most locations, storm surges, formed through the combined effect of atmospheric pressure changes and strong winds, were the major contributors to the extreme sea level events. For the Russian and Japanese coasts, the first typhoon, Maysak, turned out to have the greatest impact, while for the southeastern coast of the Korean Peninsula, the largest sea level variations were caused by the second typhoon, Haishen. At all sites, the passing storms induced eigen oscillations in the respective bays and harbours. Pronounced high-frequency oscillations with periods of two to seven minutes, which appear to be associated with infragravity waves, were recorded, reaching a maximum range of 2 m at Preobrazheniye. The observed differences in component content and associated characteristics of the observed sea level variations arise from differences in the topographic features of the corresponding coastal sites. Statistical analysis of the atmospheric pressure and wind speed series taken from weather stations and from the ERA5 reanalysis shows that atmospheric pressure is reproduced by reanalysis with high accuracy, whereas wind speed at different stations has significant discrepancies related to differences in orographic features.
Keywords
About the authors
D. A. Smirnova
Lomonosov Moscow State University; Shirshov Institute of Oceanology, Russian Academy of Sciences
Author for correspondence.
Email: moscowdadas@gmail.com
Russia, Moscow; Russia, Moscow
I. P. Medvedev
Shirshov Institute of Oceanology, Russian Academy of Sciences
Email: moscowdadas@gmail.com
Russia, Moscow
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