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| 題名: | Changes in the levels and variability of halocarbons and the compliance with the Montreal Protocol from an urban view |
| 作者: | 歐陽長風;Ou-Yang, Chang-Feng;Chang, Chih-Chung;Chen, Shen-Po;Chew, Clock;Lee, Bo-Ru;Chang, Chih-Yuan;Montzka, Stephen A.;Dutton, Geoffrey S.;Butler, James H.;Elkins, James W.;Wang, Jia-Lin |
| 貢獻者: | 理學院化學學系 |
| 關鍵詞: | Air Pollutants - analysis;Approximation;Atmosphere - chemistry;Carbon tetrachloride;chlorofluorocarbons;Cities;compliance;emissions;Environmental Monitoring;Flasks;Guideline Adherence - statistics & numerical data;Halocarbons;Hydrocarbons, Halogenated - analysis;International Cooperation;Montreal Protocol;Networks;NOAA;Ozone - chemistry;Ozone-depleting substances (ODS);Sampling;Standard deviation;statistical analysis;Taiwan;urban areas;Variability |
| 日期: | 2015-11-01 |
| 上傳時間: | 2026-04-21 14:39:47 (UTC+8) |
| 出版者: | Elsevier Ltd.;England: Elsevier Ltd |
| 摘要: | 摘要： •The variability of 7 halocarbons in Taipei was re-examined after 14years.•The reduced variability implies that the emissions have been largely curbed.•Average concentrations of ODS in Taipei have approximated background levels. 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 (2.0ppt and 1.9ppt, 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.
其他題名： Chemosphere
出版者： England: Elsevier Ltd
出版日期： 2015-11
出處： Chemosphere (Oxford), 2015-11, Vol.138, p.438-446
版權： 2015 Elsevier Ltd
版權： Copyright © 2015 Elsevier Ltd. All rights reserved.
識別號： ISSN: 0045-6535
識別號： ISSN: 1879-1298
識別號： EISSN: 1879-1298
識別號： DOI: 10.1016/j.chemosphere.2015.06.070
識別號： PMID: 26160300 |
| 顯示於類別: | [化學學系] 期刊論文
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