北京地区低能见度区域分布初探  

A Study on Regional Distribution of Low Horizontal Visibility in Beijing Area

作　　者：赵习方[1] 徐晓峰[1] 王淑英[1] 孟燕军[1] 

机构地区：[1]北京市气象科学研究所,北京100089

出　　处：《气象》2002年第11期55-57,F003,共4页Meteorological Monthly

基　　金：北京市科委"高速公路大气能见度监测;预报方法研究"项目资助

摘　　要：选用了水平能见度小于 10 0 0m的低能见度作为影响城市交通运输的一个指标 ,并研究了低能见度在北京地区时空分布特征。按水平能见度小于 10 0 0m的出现频率 ,多年日均变化曲线及全年日均、月均、季均变化特征 ,将北京地区划分为 3个区 ,即东南部平原地区、西北部山区及东北～西南部过渡区。同时讨论了雾、浮尘等天气现象对北京地区低能见度的影响 ,得出影响北京地区低能见度的主要因子是雾。The temporal and spatial distribution characteristics of the low horizontal visibility (lower than 1000 m) in Beijing are studied, which is chosen as an index that would affect urban traffic and transportation. According to both mean daily variation over many years and mean daily, monthly and seasonal variation in a year of low visibility frequency, Beijing is divided into three different parts, the southeastern plain area, the northwestern mountainous area, and northeastern to southwestern transitional area. The effect of some synoptic phenomena, such as fog, fly ash, and so on, upon the low visibility in Beijing is also discussed. It is shown that fog is the main factor affecting visibility.

关 键 词：北京 能见度 能见度等级 出现频率 区域分布 雾 浮尘 

分 类 号：P427.22[天文地球—大气科学及气象学]