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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-Chu ng Changb, Ying Liuc, Yuanhang Zhangc, Shaw Liub, Min Shao
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Atmospheric Environment 42 (2008) 6233–6246

Jan 17, 2016

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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. - PowerPoint PPT Presentation
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Page 1: Atmospheric Environment 42 (2008) 6233–6246

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

Page 2: Atmospheric Environment 42 (2008) 6233–6246

Guangzhou (urban) and Xinken (rural) in the Pearl River Delta, China.

Page 3: Atmospheric Environment 42 (2008) 6233–6246

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.

Page 4: Atmospheric Environment 42 (2008) 6233–6246

Instrumentation

Page 5: Atmospheric Environment 42 (2008) 6233–6246

Guangzhou : Time-series observation of propane, toluene, isoprene

Page 6: Atmospheric Environment 42 (2008) 6233–6246

Guangzhou : Time-series observation of VOC (TVOC), CO, and NO

Page 7: Atmospheric Environment 42 (2008) 6233–6246

Xinken: Time-series observation of propane, toluene, isoprene

Page 8: Atmospheric Environment 42 (2008) 6233–6246

Xinken: Time-series observation of VOC (TVOC), CO, and NO

Page 9: Atmospheric Environment 42 (2008) 6233–6246

Surface windflow patterns andPBL heights (m) over the PRD

Page 10: Atmospheric Environment 42 (2008) 6233–6246

Guangzhou & Xinken

Page 11: Atmospheric Environment 42 (2008) 6233–6246

Top 10 NMHCs ranked by their concentration ranges (ppbv)

Page 12: Atmospheric Environment 42 (2008) 6233–6246

isoprene versus 3-methylpentane

Page 13: Atmospheric Environment 42 (2008) 6233–6246

hourly averaged concentration of three categories of NMHCs

Page 14: Atmospheric Environment 42 (2008) 6233–6246

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

Page 15: Atmospheric Environment 42 (2008) 6233–6246

Car exhaustFuel/solvent evaporation

Page 16: Atmospheric Environment 42 (2008) 6233–6246

ethylbenzene versus m,p-xylene

Page 17: Atmospheric Environment 42 (2008) 6233–6246
Page 18: Atmospheric Environment 42 (2008) 6233–6246

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.