杭州市大气超细颗粒数浓度谱季节性特征

Study on Number Concentration Distribution of Atmospheric Ultrafine Particles in Hangzhou

利用快速迁移率粒径谱仪(fast mobility particle sizer,FMPS)对杭州市大气超细颗粒进行监测,并对杭州市2011～2012年大气超细颗粒物的数浓度、粒径分布的季节变化及其与气象之间的关系进行研究.结果表明,杭州市超细颗粒数浓度呈对数双峰分布,季节变化特征为冬季>夏季>春季>秋季,12月值最高,为3.56×104cm-3,10月最低,为2.51×104cm-3.CMD(count medium diameter)季节变化特征为春>冬>秋>夏,4月最高,为53.51 nm;6月最低,为16.68 nm.气象因素对超细颗粒数浓度有一定影响.

Atmospheric ultrafine particles（UFPs） were measured with fast mobility particle sizer（FMPS） in Hangzhou,during March 2011 to February 2012.The number concentration and size distribution of UFPs associated with meteorology were studied.The results showed that the number concentration of UFPs was logarithmic bi-modal distribution,and the seasonal levels presented wintersummerspringautumn.The highest monthly average concentration was 3.56×104 cm-3 in December and the lowest was 2.51×104 cm-3 in October.The seasonal values of count medium diameter（CMD） were springwinterautumnsummer.The highest monthly average CMD was 53.51 nm in April and the lowest was 16.68 nm in June.Meteorological factors had effects on concentration of UFPs.