Nocturnal new particle formation events in urban environments
作者： Farhad Salimi , Md. Mahmudur Rahman , Sam Clifford , Zoran Ristovski , Lidia Morawska
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摘要: Abstract. Few studies have investigated nocturnal new particle formation (NPF) events, and none of them were conducted in urban environments. Nocturnal NPF can potentially be a significant source particles areas, studying would improve our understanding nucleation mechanisms. To address this, study was an environment to investigate the physical characteristics with particular focus on events differences between daytime events. Particle number size distribution (PNSD) measured for 2 weeks at each 25 sites across environment. A method proposed automatically categorise based growth rate (GR) order remove bias related manual procedure. Out 219 observed 118 101 categorised into class I II respectively 73 happened during nighttime which included more than 30 % GR condensation sink (CS) calculated slight negative relationship CS observed. displayed higher GRs compared daylight ones average about 10 %. Back trajectory analysis also estimate locations sources precursors. While precursors originated from different no pattern, back-trajectory showed many air masses associated transported over ocean. Overall, found studied and/or
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