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 (14920 pptv, average95% confidence interval, p<0.01), MAC (709 pptv, p<0.01) and MVK (16922 pptv, p<0.1) were significantly higher than the average nighttime values (205 pptv, 498 pptv and 13925 pptv, respectively). The relationship between MVK and MAC indicated that nearby isoprene oxidation dominated their daytime abundances, while NO<sub>3</sub> 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 64min. Regression analysis of total O<sub>3</sub> (O<sub>3</sub>+NO<sub>2</sub>) 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.
| Original language | English |
|---|---|
| Article number | D19303 |
| Journal | Journal of Geophysical Research Atmospheres |
| Volume | 117 |
| Issue number | 19 |
| DOIs | |
| Publication status | Published - 1 Jan 2012 |
ASJC Scopus subject areas
- Geophysics
- Forestry
- Oceanography
- Aquatic Science
- Ecology
- Water Science and Technology
- Soil Science
- Geochemistry and Petrology
- Earth-Surface Processes
- Atmospheric Science
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science
- Palaeontology