期刊
ENVIRONMENTAL RESEARCH LETTERS
卷 13, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1748-9326/aa9c87
关键词
carbon tetrachloride; emissions; chloromethane
资金
- NASA Atmospheric Composition Campaign Data Analysis and Modeling program [NNH13ZDA001N-ACCDAM]
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.
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