Seasonal behavior of carbonyls and source characterization of formaldehyde (HCHO) in ambient air

K. H. Lui, Steven Sai Hang Ho, Peter K.K. Louie, C. S. Chan, Shuncheng Lee, Di Hu, P. W. Chan, Jeffrey Chi Wai Lee, K. F. Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)

Abstract

Effective photochemical pollution control strategies demand a thorough understanding of photochemical oxidation precursors, making differentiation between sources of primary and secondary generated HCHO inevitable. Spatial and seasonal variations of airborne carbonyls based on two years of measurements (2012–2013), coupled with a correlation-based HCHO source apportionment analysis, were determined for three sampling locations in Hong Kong (denoted HT, TC, and YL). Formaldehyde and acetaldehyde were the two most abundant compounds of the total quantified carbonyls. Pearson's correlation analysis (r > 0.7) implies that formaldehyde and acetaldehyde possibly share similar sources. The total carbonyl concentration trends (HT < TC < YL) reflect location characteristics (urban > rural). A regression analysis further quantifies the relative primary HCHO source contributions at HT (∼13%), TC (∼21%), and YL (∼40%), showing more direct vehicular emissions in urban than rural areas. Relative secondary source contributions at YL (∼36%) and TC (∼31%) resemble each other, implying similar urban source contributions. Relative background source contributions at TC could be due to a closed structure microenvironment that favors the trapping of HCHO. Comparable seasonal differences are observed at all stations. The results of this study will aid in the development of a new regional ozone (O3) control policy, as ambient HCHO can enhance O3production and also be produced from atmospheric VOCs oxidation (secondary HCHO).
Original languageEnglish
Pages (from-to)51-60
Number of pages10
JournalAtmospheric Environment
Volume152
DOIs
Publication statusPublished - 1 Mar 2017

Keywords

  • Ambient air
  • Carbonyl
  • Correlation analysis
  • Seasonal variation
  • Source apportionment analysis

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science

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