标題：Observation of nucleation mode particle burst and new particle formation events at an urban site in Hong Kong作者：Wang, Dawei; Guo, Hai; Cheung, Kalam; Gan, Fuxing

來源出版物：ATMOSPHERIC ENVIRONMENT 卷：99 頁：196-205 DOI：10.1016/j.atmosenv.2014.09.074 出版年：DEC 2014

摘要：Particle number (PN) concentrations and particle size distributions (PSD) in the size range of 5.5-350 nm were continuously measured from 22 December 2010 to 20 January 2011 at an urban site in Hong Kong when northeastern monsoon prevailed. Apart from the PN peaks appeared in traffic rush hours (i.e. 08:00-09:00 and 17:00-18:00), a distinct peak of PN concentrations in the afternoon (11:00-16:00) was observed during the sampling period. Concurrent measurement data of PSD, ozone (O-3) and proxy sulfuric acid (H2SO4) concentrations revealed that the afternoon peaks observed were likely due to new particle formation (NPF) via photochemical reactions. These NPF events were frequently observed under a clean and dry weather in Hong Kong. The occurrence of NPF was closely associated with high solar radiation (SR), low relative humidity (RH) and low condensation sink (CS) in the atmosphere. Besides the NPF events, we also found four nucleation mode particle burst events, typically with increased number concentrations of nucleation mode particles (N-nuc) without growth to larger size particles. These burst events were generally accompanied by high-level primary air pollutants, i.e. sulfur dioxide (SO2), nitrogen oxide (NOx) and carbon monoxide (CO), low SR and high CS conditions. The very different characteristics of the burst events from those of the NPF events indicated that these nucleation mode particle burst events were not caused by the photochemical reactions, but by the primary emission from the local combustion source(s).

入藏号：WOS:000345804400022

文獻類型：Article

語種：English

作者關鍵詞：Nucleation mode particle, New particle formation, Primary emission, Nucleation burst

擴展關鍵詞：NUMBER SIZE DISTRIBUTIONS; SULFURIC-ACID CONCENTRATION; LARGE ENVIRONMENTAL CHAMBER; YUN-YEN TEMPLE; ULTRAFINE PARTICLES; AIR-POLLUTANTS; VEHICLE EMISSIONS; GROWTH-RATES; NEW-YORK; ON-ROAD

通訊作者地址：Guo, Hai; Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China.

電子郵件地址：ceguohai@polyu.edu.hk

地址：

[Wang, Dawei; Gan, Fuxing] Wuhan Univ, Sch Resource & Environm Sci, Dept Environm Engn*, Wuhan 430072, Peoples R China.

[Wang, Dawei; Guo, Hai; Cheung, Kalam] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China.

[Wang, Dawei; Guo, Hai; Cheung, Kalam] Hong Kong Polytech Univ, Shenzhen Res Inst, Shenzhen, Peoples R China.

研究方向：Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences

ISSN：1352-2310

eISSN:1873-2844