Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6329
Title: Observations of isoprene, methacrolein (MAC) and methyl vinyl ketone (MVK) at a mountain site in Hong Kong
Authors: Guo, H 
Ling, ZH
Simpson, IJ
Blake, DR
Wang, D
Keywords: Isoprene
Methacrolein
Methyl vinyl ketone
Mountain
Regional transport
Issue Date: Oct-2012
Publisher: Wiley-Blackwell
Source: Journal of geophysical research. Atmospheres, Oct. 2012, v. 117, no. D19, D19303 How to cite?
Journal: Journal of geophysical research. Atmospheres 
Abstract: A field campaign was carried out in September–November 2010 near the summit of Mt. Tai Mo Shan in Hong Kong. Isoprene, methyl vinyl ketone (MVK) and methacrolein (MAC) were measured. The average isoprene mixing ratio was 109 pptv, and the average MAC and MVK levels were 68 pptv and 164 pptv, respectively. The average daytime levels of isoprene (149 ± 20 pptv, average ± 95% confidence interval, p < 0.01), MAC (70 ± 9 pptv, p < 0.01) and MVK (169 ± 22 pptv, p < 0.1) were significantly higher than the average nighttime values (20 ± 5 pptv, 49 ± 8 pptv and 139 ± 25 pptv, respectively). The relationship between MVK and MAC indicated that nearby isoprene oxidation dominated their daytime abundances, while NO3 chemistry and regional transport of anthropogenic sources from inland Pearl River Delta region could explain the higher MVK to MAC ratios at night. Correlation analysis of [MVK]/[isoprene] versus [MAC]/[isoprene] found that the isoprene photochemical ages were between 10 and 64 min. Regression analysis of total O₃ (O₃ + NO₂) versus MVK resulted in an estimated contribution of isoprene oxidation to ozone production of 12.5%, consistent with the simulated contribution of 10-11% by an observation-based model. (See Article file for details of the abstract.)
URI: http://hdl.handle.net/10397/6329
ISSN: 2169-897X
EISSN: 2169-8996
DOI: 10.1029/2012JD017750
Rights: ©2012. American Geophysical Union. All Rights Reserved.
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