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- Title
Decadal Trends of Speciated Non‐methane Hydrocarbons in Taipei.
- Authors
Ou‐Yang, Chang‐Feng; Hsieh, Hsin‐Cheng; Cheng, Fang‐Yi; Lin, Neng‐Huei; Chang, Shuenn‐Chin; Wang, Jia‐Lin
- Abstract
Selected non‐methane hydrocarbons (NMHCs) obtained from long‐term operation of the Photochemical Assessment Monitoring Stations (PAMS) in Taipei allowed for the assessment of the effectiveness of emission control measures on ozone precursors from 2007 to 2016. Despite the very pronounced diurnal and seasonal cycles of all the 51 target compounds, almost all species showed various degrees of declining trends over the decade. When dividing the 51 compounds into five groups of alkanes, alkenes, ethyne, aromatics, and isoprene, the decadal trends are assessed as −0.7 ± 0.8, −0.3 ± 0.1, −0.02 ± 0.14, −1.9 ± 1.2, and − 0.09 ± 0.02 ppbC year−1, respectively. Meanwhile, as evidenced by multiple NMHC ratios as effective indicators of atmospheric photochemical conditions, a trend of gradual lessening in the degree of photochemistry over time was noticed. Air masses in Taipei are suggested to be increasingly more contributed by local emissions and less affected by mixing with transboundary or long‐range transported influences. Key Points: Significant declines of non‐methane hydrocarbons were observed in Taipei as an East Asian representative metropolis from 2007 to 2016A concentration decrease of 15.8% coincides with the drop in fossil fuel sales in 2008, in association with the great economic crisisThe influences of long‐range transported air masses from East Asia on Taiwan have lessened over time
- Subjects
HYDROCARBONS; PHOTOCHEMICAL research; EMISSION control; AIR masses; FOSSIL fuels
- Publication
Journal of Geophysical Research. Atmospheres, 2020, Vol 125, Issue 16, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2019JD031578