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- Title
Strong Seasonal Transition and Complex Sources of Volatile Organic Compounds at an Urban Site in Guangzhou, China.
- Authors
Huang, Weichao; Yu, Xiaofang; Deng, Hui; Chen, Bingna; Cheng, Peng; Yang, Wenda; Li, Mei; Yuan, Bin; Wang, Ming; Gong, Yucheng
- Abstract
We report observations of non‐methane volatile organic compounds (VOCs) at an urban site in Guangzhou, China, and analyzed the seasonally contrasting composition, diurnal patterns, and sources of VOCs driven by the Asian Monsoon weather. In July, southerly low‐level jets and coastal recirculation coincided with a large enhancement of light alkanes and alkenes along with methyl tert‐butyl ether from urban transportation. Diurnal profiles of propanal and methyl vinyl ketone followed isoprene and O3, suggesting a common biogenic origin and fast photochemical production. In October, dominating northerly descending dry air mass led to a 10‐fold increase in acetone and methyl ethyl ketone, suggesting a large free tropospheric reservoir and abundant precursors of these ketones. Enhanced source apportionment aided by a comprehensive emission speciation data set identified five classes of VOCs from a much larger pool of local and regional emission sources than reported from previous studies. Seasonal transition of VOCs offers unique natural constraint for the chemistry and sources of VOCs in this and other similar regions, which warrants future long term measurements and advanced modeling and analysis. Plain Language Summary: Volatile organic compounds (VOCs) are essential ingredients in the formation of O3 and PM2.5 air pollution. Their emission sources and chemistry are very complex, making them very challenging to study and control. We analyzed data from an urban site in Guangzhou, China in two different seasons, and show some very interesting seasonal and diurnal patterns of these compounds that provide direct and natural evidence about their sources and chemistry. We further demonstrate that it is challenging yet feasible to link chemical speciation profiles of complex emission sources to atmospheric observations of VOCs. Key Points: Monsoon weather transition brought contrasting volatile organic compoundsSeasonal and diurnal patterns naturally reveal different sources of ketonesEmissions of overlapping tracers confound attribution of complex sources
- Subjects
METHYL vinyl ketone; VOLATILE organic compounds; METHYL ethyl ketone; URBAN transportation; AIR masses
- Publication
Journal of Geophysical Research. Atmospheres, 2024, Vol 129, Issue 17, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2024JD040890