title: Emissions estimates of carbon tetrachloride for 1992-2014 in China.
abstract: Discrepancies in emission estimates of carbon tetrachloride (CCl4, CTC), between bottom-up and top-down methods, have been shown since the 1990s at both the global and regional scale. This study estimates the emissions of China from 1992 to 2014 based on emission functions and aggregated activity information given reasonable uncertainties. The results show that emissions increase from 7.3 Gg/yr (5.6-9.1 Gg/yr at 95% confidential interval) to 14.0 (9.1-19.5) Gg/yr with a growth rate of 6.7 (1.9-11.4) %/yr during 1992-2002 and then decrease to a minimum of 4.3 (1.9-8.0) Gg/yr in 2011. More than 54% of the emissions during 1992-2009 are from the process agents sector. The estimates are comparable with those of other studies and those in this study based on observations during 2011-2014 using the interspecies correlation method. China's contribution to global emissions increases from 7.5% to 19.5% during 1992-2009, but the contribution is reduced to 9.9% and 8.0% in 2010 and 2011, respectively, indicating the effectiveness of compliance with the Montreal Protocol and its subsequent Amendments and Adjustments, whereby CTC emissions are phased-out. The results of this study are beneficial for narrowing the gap between bottom-up estimates and top-down emission calculations of CTC in China.
authors.affiliation: College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
authors.forename: Pengju
authors.initials: P
authors.lastname: Bie
authors.affiliation: Center for Global Change Science, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA02139, United States.
authors.forename: Xuekun
authors.initials: X
authors.lastname: Fang
authors.affiliation: College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
authors.forename: Zhifang
authors.initials: Z
authors.lastname: Li
authors.affiliation: College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
authors.forename: Ziyuan
authors.initials: Z
authors.lastname: Wang
authors.affiliation: College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China. Electronic address: jianxin@pku.edu.cn.
authors.forename: Jianxin
authors.initials: J
authors.lastname: Hu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis* / Q000266:history*; D002251:Carbon Tetrachloride / Q000032:analysis*; D002681:China; D004784:Environmental Monitoring / Q000266:history*; D049673:History, 20th Century; D049674:History, 21st Century; D001335:Vehicle Emissions / Q000032:analysis*
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions; D002251:Carbon Tetrachloride
keywords: Bottom-up method; Carbon tetrachloride; Emission; Interspecies correlation method