深圳冬季霾日的大气污染特征

2009年1月10日─2月16日,利用在线仪器获得深圳市冬季大气中气态污染物和PM1主要化学组分的高时间分辨率数据,结合气象条件,对非霾日、霾日的大气污染物和PM1主要化学组分浓度水平及其日变化特征进行了研究.结果表明:深圳冬季霾日除O3外,其他气态污染物和PM1主要化学组分的平均质量浓度均明显高于非霾日,增幅均在40%以上;PM1中的有机物是深圳冬季霾的首要污染因子;PM1主要化学组分的日变化趋势不尽相同,但总体上表现出霾日高于非霾日的特征,尤其是午夜至清晨时段,这说明深圳冬季霾日的夜间大气扩散能力显著减弱.

Characteristics of Air Pollution on Hazy Days in Shenzhen in Winter

The gaseous pollutants and main PM1 components were measured using advanced online instruments with high time resolution in Shenzhen from January 10 to February 16,2009.Combined with analysis of the meteorological conditions,the concentrations and diurnal variations of various gaseous pollutants and main PM1 components were compared between hazy and non-hazy days.The results showed that the average concentrations of all gaseous and PM1 pollutants with the exception of O3 increased by over 40% on hazy days,and organic matter in PM1 was the primary contributor to the haze.The average diurnal variations of the PM1 components had different trends,though they generally showed higher concentration levels on the hazy days than on the non-hazy days,especially from midnight to early morning,indicating that the capacity of atmospheric dispersion decreased significantly at night on hazy days in winter in Shenzhen.