The Influence of Typhoon “MITAG” on Waves and Currents in Zhoushan Sea Area, China

Bin Xue,Yun Ye,Yuqian Niu,Mantravadi Venkata Subrahmanyam,Biyun Guo

doi:10.3390/atmos12081027

Abstract

Typhoon “MITAG” was generated at the end of September 2019 and landed briefly in Zhoushan on October 1. Based on reanalysis data provided by ERA5 and NCEP, this paper analyzes the characteristics of wave and current during “MITAG”. The variation rule of waves and currents in different periods during the influence of “MITAG” was found. The results are as follows: The variation of significant wave height and mean wave period is related to its waveform. The single waveform has a long wave period and the correlation between wave height and wave period reaches 0.87 during the wind wave period. The wave period of the mixed waveform is shorter. The Ekman pumping of the ocean by “MITAG” is concentrated on the right side of the typhoon path when it is away from land; however, Ekman pumping is on the land side when the typhoon is close to the land. The sea surface height of the coastal sea area changes regularly with the distance of “MITAG”. The area which has a strong current is consistent with higher wave height.

Highlights

Typhoon is a strong air–sea interaction process which affects the coastal area
During 1949–2018, a total of 2999 typhoons were generated in the Northwest Pacific Ocean (NPO), among which 627 landed over the coastal area of China [1]
Xiao L. et al [12], based on FVCOM, simulated the response process of the upper ocean in the period of typhoons “RAMMASUN” and “MATMO”, and the results indicate that the variety in the current field can reach 0.4 ms−1 during a typhoon

Summary

Introduction

Typhoon is a strong air–sea interaction process which affects the coastal area. During 1949–2018, a total of 2999 typhoons were generated in the Northwest Pacific Ocean (NPO), among which 627 landed over the coastal area of China [1]. 32.8 typhoons were generated in NPO per year, and nine typhoons caused landfall over the China coast. Su et al [1] analyzed the characteristics of typhoons that landed in China from 1949 to 2018. A large number of clouds will be produced when typhoon transits, and ordinary remote sensing methods, cannot penetrate the clouds. Zhu et al [7], analyzed the influence of typhoon on marine dynamic environment by microwave remote sensing. Typhoon produces strong wind and heavy rainfall. A strong deep typhoon low pressure system is a prerequisite for rainfall [9]

Methods

Discussion

Conclusion