内蒙古兴安盟一次大雾天气过程特征  

Characteristics of a Fog Process in Eastern Inner Mongolia

作　　者：高宇 刘艳平 高红霞 

机构地区：[1]内蒙古兴安盟气象局,乌兰浩特137400

出　　处：《气象科技》2015年第2期289-294,共6页Meteorological Science and Technology

基　　金：内蒙古兴安盟气象局科研开发项目"兴安盟雾霾天气特征和预报技术研究"资助

摘　　要：2013年10月21—22日内蒙古兴安盟大部分地区出现了能见度不足1000m的雾,本文利用MICAPS系统下常规资料、探空资料以及NCEP2.5°×2.5°再分析资料对这次大雾过程做了分析。结果表明:此次大雾天气过程共持续2天,在21日白天和22日白天强度最强,能见度最差,最小能见度不足100m。大雾是发生在500hPa西南气流,850hPa暖脊中,地面则表现为低压前部和弱高压场中。东南气流的暖湿空气输送和逆温层的稳定存在为大雾的维持提供了有利条件。高空冷涡前部强上升运动区,使近地面层的湿度条件减弱是大雾消散的主要原因。A heavy fog event with visibility less than 1000 meters covering most parts of Hinggan League on 21 and 22 October 2013 is analyzed. The conventional data on the MICAPS system, radiosonde data, and NCEP 2.5°× 2.5° reanalysis data are used to diagnose and analyze this fog process. The results show that： the foggy weather process lasted two days. The strongest fog occurred in the day time of 21 and 22 October with the minimum visibility less than 100 meters. The fog occursred in the southwest airflow at 500 hPa and the warm ridge at 850 hPa, and the forehead of a low-pressure field and a weak high pressure field are manifested on the ground. A stable existence of an inversion layer and southeast warm transportation provided favorable conditions for fog maintenance. The decreasing of ground humidity caused by the strong ascending air in the front of the high-altitude cold vortex is the main reason for the dissipation of the fog.

关 键 词：大雾 逆温 温度平流 

分 类 号：P458.122[天文地球—大气科学及气象学]