摘要
利用2009年12月至2010年11月的上海气象资料、颗粒物资料和后向轨迹聚类分析方法对在此期间的霾日进行统计分析。结果表明，上海霾发生时多盛行由内陆而来的西南和西北气流，且各季有所不同，夏季以西南气流为主、春季比较平均，秋，冬季节则以西北气流为主；较高的相对湿度和较小的风速有利于霾的形成；上海霾的发生受到本地和外部输送两方面因素影响，其中以本地影响为主；细颗粒物对霾的发生贡献很大，上海绝大部分的霾日中，PM2.5／PM10的比值都达到0．5以上；上海霾的产生可能与机动车尾气排放有比较密切的关系。
Based on meteorological information and airborne particulate data of Shanghai in the period of December 2009 through November 2010, a statistic analysis on the haze occurrence was made by using backward trajectory cluster analysis method. Results have shown that haze in Shanghai often happened when southwest and northwest airstreams from interior regions were prevailing whilst the former occurred mainly in summer and the latter did in autumn and winter. Higher relative humidity and slower wind velocity could help form haze. The occurrence of haze in Shanghai was both affected by local and external factors in which the local one was dominant. Fine particulates contributed a lot to haze generation whilst the ratio of contents of PM2.5 to PM10 was greater than 0.5 on most of haze days. The formation of haze in Shanghai was probably closely related to the exhaust emission of motorised vehicles,
出处
《上海环境科学》
CAS
2014年第3期115-118,124,共5页
Shanghai Environmental Sciences
关键词
后向轨迹
相对湿度
风向
颗粒物
影响因素
Backward trajectory Relative humidity Wind direction Particulate matter Affecting factor
