Abstract:
:Ambient levels and variability of major atmospheric halocarbons, i.e. CFC-12, CFC-11, CFC-113, CCl4, CH3CCl3, C2HCl3, and C2Cl4 in a major metropolis (Taipei, Taiwan) were re-investigated after fourteen years by flask sampling in 2012. Our data indicates that the variability expressed as standard deviations (SD) of CFC-113 and CCl4 remained small (2.0 ppt and 1.9 ppt, respectively) for the 10th-90th percentile range in both sampling periods; whereas the variability of CFC-12, CFC-11, C2HCl3, and C2Cl4 measured in 2012 became noticeably smaller than observed in 1998, suggesting their emissions were reduced over time. By comparing with the background data of a global network (NOAA/ESRL/GMD baseline observatories), the ambient levels and distribution of these major halocarbons in Taipei approximated those at a background site (Mauna Loa) in 2012, suggesting that the fingerprint of the major halocarbons in a used-to-be prominent source area has gradually approached to that of the background atmosphere.
journal_name
Chemospherejournal_title
Chemosphereauthors
Ou-Yang CF,Chang CC,Chen SP,Chew C,Lee BR,Chang CY,Montzka SA,Dutton GS,Butler JH,Elkins JW,Wang JLdoi
10.1016/j.chemosphere.2015.06.070subject
Has Abstractpub_date
2015-11-01 00:00:00pages
438-46eissn
0045-6535issn
1879-1298pii
S0045-6535(15)00689-Xjournal_volume
138pub_type
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