The influence factors and novel character of the concentration distribution of atmospheric C{sub 2}-C{sub 10} nonmethane hydrocarbons monitored at Lanyu, Taiwan
- National Tsing Hua Univ., Hsinchu, Taiwan (China)
Continuous measurements of atmospheric C{sub 2}-C{sub 10} nonmethane hydrocarbons (NMHCs) were made at the Climate and Air Quality Taiwan Station (CATS), located in Lanyu (22{degrees}02{prime}N, 120{degrees}33{prime}E) an off-island of the southeastern Taiwan, on the Pacific Rim. Fifty-two NMHC`s components categorized in alkanes, alkenes, alkynes, aromatics and cyclic hydrocarbons are speciated and separated by Al{sub 2}O{sub 3}/KCl PLOT GC column with FID detector. Each NMHC`s component can be identified specifically by the rention index and quantified by the FID molar response which is the effective carbon number response well calibrated by the gas standards. The frequency-vs-concentration plots of the 14 months sampling data were made for each NMHC`s component. Three modes of concentration distribution was discovered for each NMHC`s component. The approximate ratio of the averaged concentration of each mode was 1:2.5:5. This constant ratio was realized by observing the relative concentration (normalized on pentane concentration) of 52 NMHC`s components uniquely constant. This unique relative concentration distribution of 52 NMHC`s components was used to be compared with the available published data monitored elsewhere. Fifty-two NMHC`s components were analyzed for each possible anthropogenic source, e.g., vehicle`s exhaust emission, gasoline vapor emission and utility natural gas. A multivariate chemometric analysis technique was applied to calculate the influence contribution factor from these emission sources. The motor vehicles emission was the dominant contribution. The atmospheric transport of the pollution air mass was also analyzed for transporting such polluted air plume to such remote site of Lanyu. The emission flux of the pollution air plume was estimated at such Pacific Rim region. The possible photochemical influence of the concentration distribution was not very obvious. This indicates the photochemical activity about the same in the whole year.
- OSTI ID:
- 466208
- Report Number(s):
- CONF-9606185-; TRN: 96:005931-0159
- Resource Relation:
- Conference: 5. international conference on atmospheric sciences and applications to air quality, Seattle, WA (United States), 18-20 Jun 1996; Other Information: PBD: 1996; Related Information: Is Part Of The 5th international atmospheric sciences and applications to air quality conference; PB: 322 p.
- Country of Publication:
- United States
- Language:
- English
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