乐亭海岸带大雾统计分析及监测

利用乐亭2001~2010年大雾监测地面观测资料,对乐亭大雾日、持续时间、雾的生、消时刻等进行统计.结果显示:近10a大雾日年际变化不大,但具有明显的日、月变化,其中以10~12月大雾日数最多;一年四季大雾生、消的最多时刻随着季节的转换日出时间的不同而有所差异,春、夏季生成时刻以05:00~06:00最多,秋、冬季以06:00~07:00为多.大雾的生成是多种气象条件和大气环流形势共同作用的结果,通过分析发现乐亭沿海东到偏东南风有利于暖平流和水汽的输送,弱的均压场有利于大气层结的稳定,适宜的海温均有利于产生大雾天气.对乐亭沿海大雾气候特征的分析及监测方法的探究,目的在于为沿海大雾天气的预报、预防、监测及更好的开展雾的预警服务工作提供基本依据.

Statistical analysis and monitoring on heavy fog in Leting coastal zone

According to the surface observation data of Leting station from 2001 to 2010,the number of foggy days,duration,start and end time are counted up.The results show that annual foggy days have changed litter in recent 10 years with obvious diurnal and monthly variation.The number of fog days is the most from October to December.The moment of fog emergence varies according to seasonal transition and the time of sunrise.The fog appears most from 5 am to 6 am in spring and summer while from 6 am to 7 am in autumn and winter.The generation of fog is the result of a variety of weather conditions and atmospheric circulation.The analysis finds that winds from east to southeast in Leting coast help to the transportation of warm advection and vapor,the weak average pressure fields help to the atmospheric stability and appropriate sea surface temperature is conducive to the fog.The analysis of climate characteristics in Leting coastal zone and exploring the monitoring methods are aimed at providing the basic foundation for the coastal heavy fog forecast,prevention,monitoring and better development of services to fog warning.