EGU21-11077
https://doi.org/10.5194/egusphere-egu21-11077
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Extreme sea level oscillations in the Sea of Japan caused by typhoons Maysak and Haishen in September 2020

Daria Smirnova1, Igor Medvedev2,3, Alexander Rabinovich2,4, and Jadranka Šepić5
Daria Smirnova et al.
  • 1Lomonosov Moscow State University, Geography, Oceanology, Moscow, Russian Federation (dasha@a-smirnov.com)
  • 2Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russian Federation
  • 3Fedorov Institute of Applied Geophysics, Moscow, Russian Federation
  • 4Institute of Ocean Sciences, Sidney, British Columbia, Canada
  • 5Institute of Oceanography and Fisheries, Split, Croatia

Two hazardous typhoons, Maysak and Haishen, in September 2020 produced extreme sea level oscillations in the Sea of Japan. These typhoons generated three different types of sea level variations: 1) storm surges (with typical periods from several hours to 1.5 days), 2) extreme seiches (with periods from a few minutes to several tens of minutes), and 3) storm-generated infragravity waves (with periods up to 3-5 min). The data from eleven tide gauges on Russian, Korean, and Japanese coasts were used to examine the properties of these oscillations. The relative contribution of the three separate sea level components and their statistical characteristics (duration, wave heights, and periods) were estimated. The periods of the main eigen modes of individual bays and harbours in the Sea of Japan were estimated based on spectral analysis of longterm background records at the corresponding sites. The results of wavelet analysis show the frequency properties and the temporal evolution of individual sea level components. We found that high-frequency sea level oscillations at stations Preobrazheniye and Rudnaya Pristan have a “white noise” spectrum, caused by the dominance of infragravity waves. A high correlation was detected between the variance of high-frequency sea level oscillations at these stations and the significant wind wave height evaluated from ERA5 for this water area.

How to cite: Smirnova, D., Medvedev, I., Rabinovich, A., and Šepić, J.: Extreme sea level oscillations in the Sea of Japan caused by typhoons Maysak and Haishen in September 2020, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-11077, https://doi.org/10.5194/egusphere-egu21-11077, 2021.

Displays

Display file