Changes in the levels and variability of halocarbons and the compliance with the Montreal Protocol from an urban view

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101640

Title:	Changes in the levels and variability of halocarbons and the compliance with the Montreal Protocol from an urban view
Authors:	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
Contributors:	理學院化學學系
Keywords:	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
Date:	2015-11-01
Issue Date:	2026-04-21 14:39:47 (UTC+8)
Publisher:	Elsevier Ltd.;England: Elsevier Ltd
Abstract:	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
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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