石家庄市周边秸杆焚烧导致云凝结核变化的特征  

Characteristics of CCN concentration change caused by straw burning around Shijiazhuang City

作　　者：张晶[1,2] 郑有飞[1] 李云川[2,3] 侯瑞钦 刘宏举[5] 董晓波[3] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,江苏南京210044 [2]河北省气象与生态环境重点实验室,河北石家庄050021 [3]河北省人工影响天气办公室,河北石家庄050021 [4]河北省气象台,河北石家庄050021 [5]河北省气象科技服务中心,河北石家庄050021

出　　处：《大气科学学报》2011年第3期343-350,共8页Transactions of Atmospheric Sciences

基　　金：科技部农业科技成果转化项目(2008GB24160441)

摘　　要：利用DMTCCN仪定点观测的云凝结核(cloud condensation nuclei,CCN)粒子浓度资料,对2007年6月11—13日石家庄市出现的一次空气质量和能见度均十分差的灾害性极端天气事件进行了分析。结果表明,这次极端事件与周边地区焚烧秸杆的人为活动密切相关;对流层中、高层维持的下沉气流,迫使烟雾聚集在近地面层而使得CCN粒子数相对增加;垂直湍流交换微弱抑制了近地面层烟雾的垂直扩散,从而加剧低能见度的恶化,并导致霾天气形成;逆温层的厚度和地面静风、风速偏小同样使形成的烟雾在特殊地形作用下聚集。Based on the fixed-point observation data of CCN（cloud condensation nuclei） concentration from DMT（Droplet Measurement Technologies）,an extreme disastrous weather occurred during June 11—13,2007 in Shijiazhuang,with the air quality and visibility being both bad,is analyzed.Results show that the extreme weather is closely related to the straw burning（one of the human activities） around Shijiazhuang City.The persistent downward flow in the middle and high troposphere forces the smog to gather near the ground layer,and makes the number of CCN particles increases.The weak exchange of vertical turbulence restrains the vertical diffusion of smog near the ground layer,which makes the visibility much worse and leads to the formation of haze weather.The thickness of temperature inversion and the low wind velocity on the ground jointly enable the smog to accumulate over the special terrain

关 键 词：秸杆焚烧 空气质量 CCN数浓度 霾 

分 类 号：P426.3[天文地球—大气科学及气象学]