Characterization of ozone precursors in the Pearl River Delta by time series observation
of non-methane hydrocarbons
Atmospheric Environment 42 (2008) 6233–6246
Jia-Lin Wanga, Chieh-Heng Wanga, Cheng-Hsun Laia, Chih-Chung Changb, Ying Liuc, Yuanhang Zhangc, Shaw Liub, Min Shao
Site description
From 16 October to 5 November in 2004
Guangzhou
• urban center of Guangzhou city
• about 55m above ground
• wind direction : NNE and NNW
Xinken
• rural area
• about 10m height
• wind direction : NE and N
※ ES sea breeze was observed in late afternoon.
Composition of NMHCs
• LPG-related species : propane, n-butane, and iso-butane
• Guangzhou
• 58% of total alkanes , 35% of total VOC
• Xinken
• 42% of total alkanes , 22% of total VOC
conclusion
• Diurnal patterns and correlation between the concentrations of NMHCs, NO, and CO suggest that vehicle exhaust is the dominant source of ozone precursors in Guangzhou.
• A large portion of NMHCs in Guangzhou is found to be related to LPG used as fuel for motor vehicles.
• The use of PCA and E/X as age indicator reveals that the air masses observed in Xinken are well aged and photochemically processed, which explains the high level of ozone frequently observed in the coastal areas of PRD such as Xinken.
Top Related