Study on objective classification of extratropical storm surge induced by cold-front along Tianjin coast

Wang Wanjun; Dou Cewei; Yin Haitao; Shen Yuefeng

doi:10.3969/j.issn.0253-4193.2020.05.004

Volume 42 Issue 5

Nov. 2020

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Wang Wanjun，Dou Cewei，Yin Haitao, et al. Study on objective classification of extratropical storm surge induced by cold-front along Tianjin coast[J]. Haiyang Xuebao，2020, 42(5)：31–40，doi:10.3969/j.issn.0253−4193.2020.05.004

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Study on objective classification of extratropical storm surge induced by cold-front along Tianjin coast

doi: 10.3969/j.issn.0253-4193.2020.05.004

1.
Tianjin Binhai New Area Meteorological Bureau, Tianjin 300457, China
2.
Tianjin Jinghai Meteorological Bureau, Tianjin 301600, China

Received Date: 2019-03-11
Rev Recd Date: 2019-09-11

Available Online: 2020-11-18

Publish Date: 2020-05-25

Abstract

Abstract

A total of 126 cases of storm surge along Tianjin coast from 1956 to 2016 were selected. Based on statistical data to study its occurrence, and classify these cases according to weather circulation situation. Extratropical storm surge induced by cold-front accounted for more than 60% of all cases, with an average of 1.28 times per year, and there is a significant increase in 2013−2016. Using Lamb-Jenkinson (L-J) objective typing method, extratropical storm surges induced by cold-front from 2003 to 2016 were objectively classified, and calculated five circulation indices. The results of objective typing showed that: except for one case which can not be classified, the other processes can be classified objectively. Among all 27 types of circulation, circulation situations of extratropical storm surges induced by cold-front are mainly concentrated in 12 types. Types of co-influence of anticyclone and eastward airflow, types of co-influence of anticyclone and northeaster airflow and types of influence of easterly airflow occurred many times, accounting for 58.8% of the total. These three types of objective circulation situation occur more frequently and increase more storm surge elevation. It can be concluded extratropical storm surges induced by cold-front can be subdivided into three types again according to objective classification. 80% of these three main circulation types are concentrated in autumn and winter. By comparing and analyzing the sea-level pressure field of typical processes, these results of objective circulation typing can be used to distinguish the direction of the cold front and the location of the center of the cold high in the circulation situation affecting the Bohai Sea. The strength of circulation index roughly indicates the strength of storm surge process. The objective circulation type and circulation index can provide objective basis for comparative analysis of storm surge cases.
- extratropical storm surge,
- cold-front,
- L-J objective typing,
- circulation indices

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References(19)

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