河北中东部一次大雾天气诊断分析  

A Diagnosis and Analysis on Foggy Weather in Middle and Eastern Hebei

作　　者：徐义国[1] 于洋 马鸿青[1] 王亚婷 XU Yiguo;YU Yang;MA Hongqing;WANG Yating

机构地区：[1]保定市气象局,河北保定071000 [2]民航华北地区空中交通管理局河北分局,河北石家庄050000

出　　处：《山西科技》2019年第6期101-104,共4页Shanxi Science and Technology

摘　　要：利用NCEP1°×1°资料、国家观测站数据对2018年11月12—14日河北中东部持续大雾天气的成因进行了诊断分析。结果表明:本次大雾分为辐射雾、平流辐射雾2个过程;晴空背景下的夜间辐射冷却作用对大雾的形成和前期维持非常有利;前期湿度的增加为大雾的发生和维持提供了有利条件,后期水汽平流补充,雾的性质转变为平流辐射雾;前期风力微弱,利于辐射雾发生,后期地面风速基本维持在0.5 m/s^2 m/s,有利于雾的维持;大气层结稳定为大雾提供了有利的层结条件。NCEP1°×1°data and data from the national observatory station were used to diagnose and analyze the causes of the persistent heavy fog in east and central Hebei from November 12 to 14,2018.The results show that the fog is divided into two processes:radiation fog and advection radiation fog.The cooling effect of radiation at night under clear sky is very beneficial to the formation and early maintenance of fog.The increase of humidity in the early stage provided favorable conditions for the occurrence and maintenance of fog.Later stage,the advection of water vapor was supplemented,and the character of fog changed into advection radiation fog.In the early stage,the wind is weak,which is conducive to the occurrence of radiation fog.In the later stage,the ground wind speed is basically maintained at 0.5 m/s^2 m/s,which is conducive to the maintenance of fog.Atmospheric stratification stabilization provides favorable stratification conditions for fog.

关 键 词：大雾天气 辐射雾 平流雾 湿度 大气层结 河北中东部 

分 类 号：P458.3[天文地球—大气科学及气象学]