摘要
选取1956-2016年共126例天津沿岸风暴潮个例,基于统计资料研究其发生规律,并按照天气形势将之分类。冷锋型温带风暴潮个例占据全部风暴潮个例的60%以上,其平均每年发生1.28次,2013-2016年有明显增多的趋势。利用Lamb-Jenkinson(L-J)客观分型方法,对2003-2016年的冷锋型温带风暴潮个例进行客观分型,并计算5个环流指数。分型结果表明:除有1例无法归类外,其余均可进行客观分类。在全部分型的27类环流类型中,冷锋型温带风暴潮个例的环流主要集中在12类之中。其中反气旋混合偏东气流型、反气旋混合东北气流型、偏东气流型均发生较多次数,共占据了总数的58.8%。此3类出现次数多,产生的增水大,可认为冷锋型温带风暴潮个例依据客观分型再次细分为此3种主要类型。3种主要的客观环流类型80%集中出现在秋、冬季节。利用典型过程的海平面气压场进行对比分析,其客观分型结果可以对影响渤海的冷锋走向和冷高压中心位置进行区分。环流指数的强弱粗略的表示了风暴潮过程的强弱。客观环流类型和环流指数,可以为风暴潮个例对比分析提供客观依据。
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.
作者
王万筠
窦策伟
殷海涛
沈岳峰
Wang Wanjun;Dou Cewei;Yin Haitao;Shen Yuefeng(Tianjin Binhai New Area Meteorological Bureau,Tianjin 300457,China;Tianjin Jinghai Meteorological Bureau,Tianjin 301600,China)
出处
《海洋学报》
CAS
CSCD
北大核心
2020年第5期31-40,共10页
基金
滨海新区突发公共事件预警信息发布系统(二期)“滨海新区智慧气象平台”(津滨审批投准[2016]1482号)。
关键词
温带风暴潮
冷锋型
L-J客观分型
环流指数
extratropical storm surge
cold-front
L-J objective typing
circulation indices
