摘要
为了研究石家庄冬季霾过程的形成原因及污染物变化特征,对2015年12月17—26日一次持续性霾过程中地面气象要素、天气背景场、PM(PM_(2.5)和PM_(10))、气态污染物(SO_2、CO、NO_2和O_3)、边界层垂直结构和数浓度垂直分布进行了综合观测分析.结果表明,华北上空稀疏的等压线和均压场结构、地面小风、高湿度的气象条件为这次霾污染的发生和持续提供了有利的动力和水汽条件.霾过程中PM_(2.5)、PM_(10)、SO_2、NO_2、O_3和CO的平均浓度分别为208.1、299.4、75.3、81.9、13.1μg·m^(-3)和4.2 mg·m^(-3),分别是清洁天的5.8、4.5、1.4、2.4、0.5和4.7倍.逆温层的存在阻碍了近地层气溶胶粒子向高层的传输.逆温层上部层边界层内<0.3μm和0.3~2.5μm的气溶胶数浓度分别减少了25%~40%和63%~85%.在<200 m高度内,<0.3、0.3~0.5、0.5~1.0和1.0~2.5μm的气溶胶在霾天的平均数浓度分别为503.0、295.7、103.9和8.9 cm^(-3),分别是清洁天的2.8、17.8、31.9和24.4倍.
The meteorological parameter,synoptic background,PM（ PM2.5and PM10）,gaseous pollutants（ SO2,CO,NO2 and O3）,boundary layer structure and vertical distribution of aerosol number concentration data were used to investigate the characteristics and formation mechanism of a longlasting haze episode in Shijiazhuang during 17—26 December 2015. Result showed that Shijiazhuang was under the control of sparse isobar and uniform pressure field,small surface wind speed and high humidity which provided favorable dynamic and moisture conditions for the occurrence of haze episode.The average concentrations of PM2.5,PM10,SO2,NO2,O3 and CO were 208.1,299.4,75.3,81.9,13.1 μg·m^-3and 4.2 mg·m^-3,respectively,and5.8,4.5,1.4,2.4,0. 5 and 4. 7 times those on clean days. The existence of inversion layer suppressed vertical transport of surface pollutant. Aerosol number concentrations with diameters〈 0.3 μm and 0.3 -2.5 μm were reduced by 25% -40% and 63% -85% above the inversion layer,respectively. The average number concentrations of aerosols with diameters〈 0.3,0.3 -0.5,0.5 -1.0 and 1.0 -2.5 μm in haze days were 503.0,295.7,103.9 and 8.9cm^-3,respectively,2.8,17.8,31.9 and 24.4 times those on clean days within 200 m height.
作者
杨洋
王红磊
侯雪伟
董晓波
朱莉莉
范根昌
赵有龙
YANG Yang WANG Honglei HOU Xuewei DONG Xiaobo ZHU Lili FAN Genchang ZHAO Youlong(Weather Modification Office of Hebei Province, Shijiazhuang 050021 Key Laboratory of Meteorological Disaster, Ministry of Education（ KLME）, Joint International Research Laboratory of Climate and Environment Change （ILCEC）, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science ＆ Technology, Nanjing 210044 Handan Meteorology Service, Handan 056001)
出处
《环境科学学报》
CAS
CSCD
北大核心
2017年第3期824-832,共9页
Acta Scientiae Circumstantiae
基金
河北省气象局科研开发项目(No.15ky36)
国家自然科学基金(No.91544229,41275143)
江苏省环保科研课题(No.2014021)
江苏高校优势学科建设工程资助项目(PAPD)~~
关键词
霾
PM2.5
气溶胶
数浓度
垂直分布
石家庄
haze
PM2.5
aerosol
number concentration
vertical distribution
Shijiazhuang
