海口市重污染天气潜在源分析研究

Potential source analysis of heavy pollution weather in Haikou

在进入冬半年后,海口市受弱冷空气或较强下沉气流控制时,易出现污染天气,对2013—2015年当年10月至翌年1月的气团轨迹进行了聚类分析、潜在源贡献因子分析(Potential Source Contribution Function,PSCF)和重轨迹分析(Concentration Weighted trajectory,CWT),结果表明:在污染时段内,海口大多受到来自中国华南和华东的东北向气流影响。PSCF和CWT分析表明,广东、福建、江西的大部分地区,以及湖南东部、广西东部等地区,是对海口地区污染天气污染物浓度的潜在贡献大值区。在进行预报时,可参考主要天气影响系统,和一些关键区域的外源影响以及本地污染的堆积情况。

After entering the winter half year,pollution weather of Haikou is easily caused by the weak cold air or downdraft.Using cluster analysis,PSCF and CWT methods,the potential source of heavy pollution weather from October to January during 2013-2015 was analyzed.The result shows that Haikou′s air quality is mainly influenced by the northeast air stream from south china and east china during the studied period.The analysis results of PSCF and CWT methods indicate that the most areas of Guangdong,Fujian and Jiangxi province as well as the east of Hunan and Guangxi province are potential areas contributing pollutant for the pollution weather of Haikou.In addition,the main weather system causing air pollution,the exotic impacting from the key area and the accumulation condition of local pollutant should be considered in pollution forecast.