摘要
2016年5月16-19日期间桂林市监测到一次轻度污染天气过程,通过分析颗粒污染物PM_(10)和PM_(2.5)的质量浓度变化特征及对应时间段的气象因子变化特征,探讨该次污染成因。结果表明:桂林市空气质量为轻度污染,污染期间近地面颗粒物质量浓度出现升高现象,其中粗颗粒物升高较为明显。16日和17日均监测到外来污染输入现象,18日出现了降水现象,气象条件有利于污染物的扩散,近地面颗粒物质量浓度显著下降。结合卫星火点图和HYSPLIT后向轨迹模拟结果可知,污染输入是从西北方向输送而来,且该地区西北方向火点图较为密集,外来污染输送可能与该方向秸秆焚烧有关。
A typical air pollution event occurred during May 16th to 19th, 2015 in Guilin, Guangxi, was monitored to ana-lyze the variation of mass concentration of PM（10） and PM（2.5）, and the meteorological impact factor which may lead to the pollution case. The result demonstrated that the air quality of Guilin was light polluted, with the particulate as the major cause of the air pollution and increasing significantly. The regional transmissions were monitored in both May 16th and 17th and a rainfall was monitored in May 18th. The meteorological conditions were beneficial to the diffusion of pollution and the mass concentration of ground layer particulate decreased significantly. Combining the result of satellite images and backward trajec-tory simulation, it was concluded that the input of pollution was transported from northwestern direction, the point figure of northwestern direction was quite intensive, and the external pollution may be associated with the straw burning.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2017年第12期165-169,共5页
Environmental Science & Technology
基金
广西重点研发项目(桂科AB16380292)
广西自然科学基金项目(2015GXNSFBA139203)
院科技创新基金(HKYCX-2015-1):南方典型旅游城市大气复合污染特征与控制对策研究
广西大气复合污染研究实验室(筹)
关键词
颗粒物污染
气溶胶激光雷达
灰霾污染
垂直分布
particulates pollution
aerosol lidar
haze pollution
vertical distribution
