Aerosols
; Carbon
; Condensation
; Optical projectors
; Particle size
; Aerosol concentration
; Aerosol mass spectrometers
; Cloud condensation nuclei
; Ground measurements
; Hygroscopic properties
; New particle formation
; Tandem differential mobility analyzers
; Urban aerosols
; Air pollution
; ammonium nitrate
; ammonium sulfate
; growth factor
; sulfate
; aerosol
; aerosol composition
; atmospheric pollution
; black carbon
; capital city
; cloud condensation nucleus
; concentration (composition)
; ground-based measurement
; hygroscopicity
; megacity
; organic carbon
; urban atmosphere
; aerosol
; air pollution
; analyzer
; Article
; chemical composition
; chemical reaction
; circadian rhythm
; cloud
; cloud condensation nuclei
; concentration (parameters)
; environmental monitoring
; mass spectrometer
; molecular size
; priority journal
; South Korea
; urban area
; volume
; wettability
; Seoul [Seoul (ADS)]
; Seoul [South Korea]
; South Korea
Scopus学科分类:
Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要:
Aerosol physical properties, chemical compositions, hygroscopicity and cloud condensation nuclei (CCN) activities were measured in Seoul, the highly populated capital city of Korea, during the Megacity Air Pollution Studies (MAPS-Seoul) campaign, in May–June 2015. The average aerosol concentration for particle diameters >10�nm was 11787���7421�cm−3with dominant peaks at morning rush hours and in the afternoon due to frequent new particle formation (NPF) events. The average CCN concentration was 4075���1812�cm−3�at 0.6% supersaturation, with little diurnal variation. The average hygroscopicity parameter (κ) value determined using a humidified tandem differential mobility analyzer (HTDMA) ranged 0.17–0.27 for a range of particle diameters (30–150�nm). The κ values derived using the aerosol mass spectrometer (AMS) data with three different methods were 0.32–0.34, significantly higher than those from HTDMA due to the uncertainties in the hygroscopicity values of different chemical compositions, especially organics and black carbon. Factors affecting the aerosol hygroscopicity seemed to be traffic and chemical processes during the NPF events. The CCN concentration predicted based on HTDMA κ data showed very good agreement with the measured one. Because of the overestimation of κ, CCN closure with the predicted CCN concentration based on AMS κ data over-predicted CCN concentration although the linear correlation between measured and predicted CCN concentration was still very good. � 2017 Elsevier Ltd
Department of Atmosphere Sciences, Yonsei University, Seoul, South Korea; Climate and Air Quality Research Department, National Institute of Environment Research, Incheon, South Korea; School of Natural Resources and Environmental Science, Kangwon National University, Gangwon-do, South Korea; Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology, Seoul, South Korea; Environmental Science Division, Hankuk University of Foreign Studies, Yongin, South Korea
Recommended Citation:
Kim N,, Park M,, Yum S,et al. Hygroscopic properties of urban aerosols and their cloud condensation nuclei activities measured in Seoul during the MAPS-Seoul campaign[J]. Atmospheric Environment,2017-01-01,153