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一、引言 我国气象工作者对西南太平洋热带风暴的研究甚少,由于远洋活动的需要,有必要对这里的风暴形成规律做些研究,以利于预报服务工作的开展。 7619号风暴是1976年4月25日在珊瑚海西北部热带辐合带(ITCZ)上生成的。它的全部生命史可分为酝酿、形成、发展和消亡四个阶段。各阶段有其清楚的天气学特征,在气压场、高度场、云图和温湿场(θ_(se))的分布上,均可反映出来。 本文着重分析了7619风暴的流场特征,点绘了各阶段中心附近纬向风速空间分布的经向剖面图。计算了该风暴形成前后,流入层平均纬向风速的水平切变值,其中心附近流场纬向风速的垂直切变值,得出了一些可供预报参考的结论。
First, the introduction of China’s meteorological workers on the Southwest Pacific tropical storm research rarely due to the needs of ocean-going activities, it is necessary to do some research on the formation of the storm here in order to facilitate the forecast service. Storm 7619 was generated on April 25, 1976, in the tropical convergence zone (ITCZ) northwest of the Coral Sea. Its entire history of life can be divided into brewing, formation, development and demise of four stages. Each stage has its own clear weather features, which can be reflected in the distribution of pressure field, altitude field, cloud image and temperature and humidity field (θ_ (se)). This paper focuses on analyzing the characteristics of the flow field of the 7619 storm and plots the longitudinal profile of the zonal wind speed near the center of each stage. The horizontal shear values of the mean zonal wind velocity of the inflow layer and the vertical shear values of the zonal wind velocity around the center of the inflow layer are calculated before and after the storm is formed. Some conclusions are drawn for the prediction.