日本以南海域一次锋面雾过程分析

摘要

利用4种观测资料及HYSPLIT-4模式对2012年6月17-19日发生在日本以南海域严重影响船舶航行安全的一次海雾过程进行了观测分析及数值模拟.结果表明:(1)此次海雾事件为典型的锋面雾过程,雾区始终处在副热带高压后部、大槽前部.前期雾区范围与锋面的发展移动密切相关,后期台风外围的卷吸作用是海雾消散的主要因素;(2)海雾发生前气海温差值约为2℃,为海雾形成提供了有利条件,近地面逆温层的存在也为海雾的发生提供了助力;(3) HYSPLIT-4模式对气粒的追踪结果表明,此次海雾过程的水汽来自东南方向,水汽向北输送过程中受副热带高压的影响不断下沉,在稳定层结条件下最终凝结成雾.%Using 4 kinds of observational data and HYSPLIT-4 model,a dense sea fog event happened in the south of Japanese sea from 17 to 19 June 2012 is investigated.The results show that:(1)It's a frontal fog occurred between trough and subtropical high.The area of the fog changes with the moving of frontal surface.The entrainment of typhoon is a main factor for fog dissipation;(2)T temperature difference between the air and sea surface is about 2°C,which provide a favorable condition for the sea fog formation.;(3)The simulated results from HYSPLIT-4 indicates that the water vapor come from the south east area and dropped under the influence of subtropical high when moving to the north,and the sea fog is formed under the stable stratification condition.