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- W2469859097 abstract "The role of different chemical compounds, particularlyorganics, involved in the new particle formation (NPF)and its consequent growth are not fully understood. Therefore,this study was conducted to investigate the chemicalcomposition of aerosol particles during NPF events in anurban subtropical environment. Aerosol chemical compositionwas measured along with particle number size distribution(PNSD) and several other air quality parameters atfive sites across an urban subtropical environment. An Aerodynecompact Time-of-Flight Aerosol Mass Spectrometer(c-ToF-AMS) and a TSI Scanning Mobility Particle Sizer(SMPS) measured aerosol chemical composition (particlesabove 50 nm in vacuum aerodynamic diameter) and PNSD(particles within 9–414 nm in mobility diameter), respectively.Five NPF events, with growth rates in the range 3.3–4.6 nm, were detected at two of the sites. The NPF eventshappened on relatively warmer days with lower condensationsink (CS). Temporal percent fractions of organics increasedafter the particles grew enough to have a signifi-cant contribution to particle volume, while the mass fractionof ammonium and sulfate decreased. This uncovered theimportant role of organics in the growth of newly formedparticles. Three organic markers, factors f43, f44 and f57,were calculated and the f44 vs. f43 trends were comparedbetween nucleation and non-nucleation days. K-means clusteranalysis was performed on f44 vs. f43 data and it wasfound that they follow different patterns on nucleation dayscompared to non-nucleation days, whereby f43 decreased forvehicle-emission-generated particles, while both f44 and f43decreased for NPF-generated particles. It was found for thefirst time that vehicle-generated and newly formed particlescluster in different locations on f44 vs. f43 plot, and this findingcan be potentially used as a tool for source apportionmentof measured particles." @default.
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- W2469859097 date "2014-01-01" @default.
- W2469859097 modified "2023-09-25" @default.
- W2469859097 title "Insights into the growth of newly formed particles in a subtropical urban environment" @default.
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