Characterization of ozone precursors in the Pearl River Delta by time series observation of...
-
Upload
margaretmargaret-harper -
Category
Documents
-
view
217 -
download
0
Transcript of Characterization of ozone precursors in the Pearl River Delta by time series observation of...
![Page 1: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/1.jpg)
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: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/2.jpg)
Guangzhou (urban) and Xinken (rural) in the Pearl River Delta, China.
![Page 3: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/3.jpg)
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: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/4.jpg)
Instrumentation
![Page 5: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/5.jpg)
Guangzhou : Time-series observation of propane, toluene, isoprene
![Page 6: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/6.jpg)
Guangzhou : Time-series observation of VOC (TVOC), CO, and NO
![Page 7: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/7.jpg)
Xinken: Time-series observation of propane, toluene, isoprene
![Page 8: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/8.jpg)
Xinken: Time-series observation of VOC (TVOC), CO, and NO
![Page 9: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/9.jpg)
Surface windflow patterns andPBL heights (m) over the PRD
![Page 10: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/10.jpg)
Guangzhou & Xinken
![Page 11: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/11.jpg)
Top 10 NMHCs ranked by their concentration ranges (ppbv)
![Page 12: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/12.jpg)
isoprene versus 3-methylpentane
![Page 13: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/13.jpg)
hourly averaged concentration of three categories of NMHCs
![Page 14: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/14.jpg)
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: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/15.jpg)
Car exhaustFuel/solvent evaporation
![Page 16: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/16.jpg)
ethylbenzene versus m,p-xylene
![Page 17: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/17.jpg)
![Page 18: Characterization of ozone precursors in the Pearl River Delta by time series observation of non-methane hydrocarbons Atmospheric Environment 42 (2008)](https://reader030.fdocuments.us/reader030/viewer/2022033106/56649d0a5503460f949dd602/html5/thumbnails/18.jpg)
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.