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Preliminary Analysis of Multi-Typhoon Influence on Hainan Province and Its Circulation Background in Autumn 2020

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DOI: 10.23977/envcp.2022.010103 | Downloads: 20 | Views: 1124

Author(s)

Chenxiao Shi 1,2, Chunxiang Shi 3, Tao Zhang 3, Jianhua Du 1,2, Honghui Zheng 1,2, Zhenli Chen 1,2

Affiliation(s)

1 Hainan Province Meteorological Information Center, Haikou, Hainan, China
2 Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Provinces, Haikou, Hainan, China
3 National Meteorological Information Center, Beijing, China

Corresponding Author

Chunxiang Shi

ABSTRACT

In order to understand some factors that many typhoons will affect the climate background and atmosphere and ocean of Hainan Province in the autumn of 2020, this paper makes a preliminary analysis of the characteristics and circulation background of many typhoons in the autumn of 2020 by using multi-source merged products, China's first generation reanalysis products (CRA-40), satellite data and ground observation data. During the period from October to November in 2021, the location of the subtropical high is east-north compared with previous years, and its intensity was weak. As a result, under the guidance of the southeasterly airstream at the edge of the subtropical high, eight typhoons converged in Hainan Province and western Guangdong, and the vertical velocity over them was basically negative, resulting in a continuous and strong wind and rain process in this area. From October to November, positive SST anomalies near the equatorial western Pacific and the South China Sea provide a steady stream of energy for typhoons in the South China Sea and the western Pacific Ocean, and negative OLR anomalies cause large-scale strong convective activities. Combined with the actual observation, it can be seen that the area of strong convective activity is mainly concentrated in the areas of 5-20°N and 110-150°E, which is the place where the sea temperature is abnormal in 2020 and the place where typhoons originated.

KEYWORDS

Multi-typhoon, circulation background, subtropical high pressure, cold air, SST pleion, OLR negative anomaly area

CITE THIS PAPER

Chenxiao Shi, Chunxiang Shi, Tao Zhang, Jianhua Du, Honghui Zheng, Zhenli Chen, Preliminary Analysis of Multi-Typhoon Influence on Hainan Province and Its Circulation Background in Autumn 2020. Environment and Climate Protection (2022) Vol. 1: 24-37. DOI: http://dx.doi.org/10.23977/envcp.2022.010103.

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