南京大学学报(自然科学版) ›› 2010, Vol. 46 ›› Issue (3): 284295.
年 瑶, 方 娟**
Nian Yao, Fang Juan
摘要: 本文利用 NCEP(1? 1?) 逐 6 h 分析资料、 FY?2C 卫星云图资料和常规气象观测资料, 从环流背景、 锋面垂直结构、 大气层结条件、 动力抬升等方面入手, 对 2008 年 1 月 25日- 29 日浙闽山区雨雪冰
冻天气过程进行了天气形势分析和天气学诊断分析. 得到如下几点结论: 1)2008 年 1 月初极地环流异常, 亚洲上空出现持久的极涡且中心明显偏强, 与此次雨雪冰冻天气关系极为密切; 东亚倒 ? 流型长时
间稳定维持, 有利于冷空气不断补充南下; 2) 南支槽活跃, 西南暖湿气流为浙闽山区输送了大量的水汽,维持在低空 850hPa 上的切变线为冷暖空气的交汇和中尺度锋生提供了条件; 3) 由于浙闽山区地形影
响, 冷空气在南下过程中受阻, 东侧冷锋越山南下与西段冷锋迎面会合, 发生锢囚, 锢囚结构在准地转 Q矢量场上表现较为明显; 4)中低空深厚锋面逆温层的存在和低于 0 ! 的地表温度为冻雨天气的发生提
供了必要条件, 大气层呈低空冷、 中间暖、 高层冷的结构对冻雨的形成非常重要, 说明冻雨天气与大气垂直结构密切相关.
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