文章基本信息

标题：Current sources of carbon tetrachloride (CCl4) in our atmosphere
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作者：David Sherry ; Archie McCulloch ; Qing Liang 等
期刊名称：Environmental Research Letters
印刷版ISSN：1748-9326
电子版ISSN：1748-9326
出版年度：2018
卷号：13
期号：2
页码：024004
DOI：10.1088/1748-9326/aa9c87
语种：English
出版社：IOP Publishing Ltd
摘要：Carbon tetrachloride (CCl₄ or CTC) is an ozone-depleting substance whose emissive uses are controlled and practically banned by the Montreal Protocol (MP). Nevertheless, previous work estimated ongoing emissions of 35 Gg year⁻¹ of CCl₄ into the atmosphere from observation-based methods, in stark contrast to emissions estimates of 3 (0–8) Gg year⁻¹ from reported numbers to UNEP under the MP. Here we combine information on sources from industrial production processes and legacy emissions from contaminated sites to provide an updated bottom-up estimate on current CTC global emissions of 15–25 Gg year⁻¹. We now propose 13 Gg year⁻¹ of global emissions from unreported non-feedstock emissions from chloromethane and perchloroethylene plants as the most significant CCl₄ source. Additionally, 2 Gg year⁻¹ are estimated as fugitive emissions from the usage of CTC as feedstock and possibly up to 10 Gg year⁻¹ from legacy emissions and chlor-alkali plants.