Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-162
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
13 Apr 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Diurnal and day-to-day characteristics of ambient particle mass size distributions from HR-ToF-AMS measurements at an urban site and a suburban site in Hong Kong
Berto P. Lee1, Hao Wang2, and Chak K. Chan1,2 1School of Energy and Environment, City University of Hong Kong, Hong Kong, China
2Division of Environment, Hong Kong University of Science and Technology, Hong Kong, China
Abstract. Mass concentration based particle size distributions measured by a high-resolution aerosol mass spectrometer were systematically analyzed to assess long and short-term temporal characteristics of ambient particle size distributions sampled at a typical urban environment close to emission sources and a suburban coastal site representing a regional and local pollution receptor location in Hong Kong. Measured distributions were bimodal and deconvoluted into submodes which were analyzed for day-to-day variations and diurnal variations. Traffic and cooking emissions at the urban site contributed substantially to particle mass in both modes, while notable decreases in mass median diameters were limited to the morning rush hour. Inorganic particle components displayed varying diurnal behavior, including nocturnal nitrate formation and daytime photochemical formation evident in both modes. Suburban particle size distributions exhibited notable seasonal disparities with differing influence of local formation, particularly in spring and summer, and transport which dominated in the fall season leading to notably higher sulfate and organic accumulation mode particle concentrations. Variations in particle mixing state were evaluated by comparison of inter-species mass median diameter trends at both measurement sites. Internal mixing was prevalent in the accumulation mode in spring at the urban site, while greater frequency of time periods with external mixing of particle populations comprising different fractions of organic constituents was observed in summer. At the suburban site, sulfate and nitrate in the accumulation mode more frequently exhibited differing particle size distributions in all seasons signifying a greater extent of external mixing. At the urban site, periods of greater submicron inorganic mass concentrations were more likely to be caused by increases in both Aitken and accumulation mode particle mass in summer, while at the suburban receptor location organic and nitrate Aitken mode particle mass contributed more regularly to higher total submicron species mass concentrations in most seasons (spring, summer and winter).

Citation: Lee, B. P., Wang, H., and Chan, C. K.: Diurnal and day-to-day characteristics of ambient particle mass size distributions from HR-ToF-AMS measurements at an urban site and a suburban site in Hong Kong, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-162, in review, 2017.
Berto P. Lee et al.
Berto P. Lee et al.
Berto P. Lee et al.

Viewed

Total article views: 230 (including HTML, PDF, and XML)

HTML PDF XML Total Supplement BibTeX EndNote
162 62 6 230 52 2 9

Views and downloads (calculated since 13 Apr 2017)

Cumulative views and downloads (calculated since 13 Apr 2017)

Viewed (geographical distribution)

Total article views: 230 (including HTML, PDF, and XML)

Thereof 228 with geography defined and 2 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 28 Apr 2017
Publications Copernicus
Download
Short summary
The size of atmospheric particles is an important physical property that determines environmental and health effects. We measured the size and chemical composition of particles in two locations in Hong Kong impacted by different predominant sources of particulate air pollutants to characterize how particle size and particle composition varies over different time frames, from changes within a day to long-term changes over weeks, and which processes and sources may have played important roles.
The size of atmospheric particles is an important physical property that determines...
Share