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Current sources of carbon tetrachloride (CCl4) in our atmosphere
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Current sources of carbon tetrachloride (CCl4) in our atmosphere
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Journal Article
Current sources of carbon tetrachloride (CCl4) in our atmosphere
2018
Overview
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.
Publisher
IOP Publishing
