台风“鲇鱼”的热力场结构特征分析

Analysis on Thermal Field Structure of Typhoon Megi

利用欧洲中心era-interim提供的再分析资料,分析了2010年西北太平洋台风"鲇鱼"(Megi)的热力场结构特征。得到了如下主要结论:台风Megi存在一个中心位于300 h Pa的暖心结构和一个中心位于100 h Pa的冷心结构。台风Megi在初始阶段会在300 h Pa左右高度上首先出现高层暖心,随着发展,暖心不断增强,该高度上沿径向方向的温度距平梯度也有所增加。在初始阶段100 h Pa高度上就可以看到一个较弱的冷心,随着发展成熟,冷心的温度距平增加,垂直厚度和水平半径增加。在台风的减弱消亡期,暖心和冷心开始减弱但仍然存在。

The thermal field structure characteristics of typhoon Megi in the northwestern Pacific in 2010 were analyzed ,by using the reanalysis provided by the European Center . The main conclusions were as follows： there was a warm center structure in the center of typhoon Megi at 100 hPa and a cold core structure in 300 hPa. In the initial stage of typhoon Megi, the top warm heart would appear first around 300 hPa. With the development, the warm heart was increasing, and the temperature gradient along the radial direction was also increased.At the initial stage, a weaker cold core could be seen on the 100 hPa height. As the development matures, the temperature difference of the cold core increased, and the vertical thickness and the horizontal radius increased.During the decline and extinction of typhoon, warm heart and cold heart began to weaken, but still existed.