diurnal and seasonal cycles of ozone precursors observed from continuous measurement at urban site...
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![Page 1: Diurnal and seasonal cycles of ozone precursors observed from continuous measurement at urban site in Taiwan Kuang-Ling Yang, Chien-Chung Ting, Jia-Lin](https://reader038.vdocuments.us/reader038/viewer/2022102818/56649ddd5503460f94ad5b3c/html5/thumbnails/1.jpg)
Diurnal and seasonal cycles of ozone precursors observed from continuous measurement at urban site in Taiwan
Kuang-Ling Yang, Chien-Chung Ting, Jia-Lin wang, Oliver W. Wingenter, Chang-Chuan Chan
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VOCs measurement
http://www.showmecleanair.com/images/ozone_chart.jpg2
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Monitoring site description
Fig. (a) Satellite mapping of Taiwan. Fig. (b) The enlarged area in (a) shows the deployment of the three stations in central Taiwan.
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Instrumental condition
• Auto-GC system in monitoring station (Perkin-Elmer, USA)
A cryogen-free sorbent trap (Peltier cooling device, -30)with dual columns and dual FIDs was configured to cope with wide volatility range of components.
Excess water vapor is removed by Nafion dryer.
Denas’ switchColumns : DB-1 (60m x 0.25mm x 1μm) C6-C12
PLOT (30m x 0.25mm x 8 μm) C2-C5
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Dual-trap dual-column GC system
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Aspect on data quality control
• 56 target compounds with absolute concentration range 20 to 40 ppb C prepared by gravimetric method (Spctra gases).
• The hourly measurement within a day comprised 23 ambient sample injections plus one standard gas injection.
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Emission source
LPG leakage
Gasoline evaporation
Biogenic emission
Vehicular exhaust
Ethane, propane
benzene benzene
Isoprene
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Results and discussion
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Fig. (a) benzene in February; (b)m, p-xylene in February
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Fig. (a) Propane in February; (b)ethane in February
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Fig. (a) Isoprene in February; (b)Isoprene in August
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Diurnal and seasonal
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Conclusion
• For species such as ethane and propane with relatively constant source characteristics, the change in mixing height is the dominant factor modulating abundance to reveal characteristic diurnal patterns.
• Chemical removal is only important from the seasonal point of view, which together with temperature inversion caused the observed seasonal variations