深圳市两次霾天气过程分析

Analysis of Two Haze Processes in Shenzhen

利用深圳国家基本气象站常规气象资料、大气成分监测数据和深圳市环境监测中心站的空气质量资料,对2010年12月20～21日、28～29日发生在深圳市的两次霾天气过程的空气污染、环流形势、气象要素、大气成分以及Hysplit模式反演等特征。结果表明:这两次霾天气过程的首要污染物是二氧化氮(NO2)。大尺度天气系统稳定为霾的发生提供了有利的大气环流条件。地面受弱高压脊控制,气压梯度小,风场弱,有利于污染物的累积和霾的维持。大气成分站数据分析发现,NO2的日变化曲线呈双峰型,峰值出现在上下班高峰期,表明NO2浓度的增加与汽车尾气排放密切相关。Hysplit模式反演污染物的后向轨迹表明这两次污染过程中均有外来污染物的输入,来自广州、东莞、惠州、河源等。

According to meteorological observation data and atmospheric composition data from Shenzhen National basic meteorological stations as well as air pollution data from Shenzhen Environmental Monitoring Center, the cause of two haze processes were analyzed, happened on Dec. 20~21 and Dec. 28~29, 2010. The results show that: The first pollutants was nitrogen dioxide(NO 2 )in these two haze processes. Large scale weather system provided a relatively stable atmospheric circulation conditions for the processes. The weak ground high pressure ridge、small pressure gradient and weak wind speed were beneficial to the accumulation of pollutants and the maintenance of haze. Analysis of atmospheric composition data found that NO 2 changes on the curve of the twin peaks in the rush hour. It showed that the increasing of the NO 2 was closely related with car exhaust emission. Hysplit model retrieved the spread of pollutants track show the two pollution processes includes foreign pollutants from Guangzhou, Dongguan, Huizhou, Heyuan, etc.