Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Current sources of carbon tetrachloride (CCl4) in our atmosphere
Carbon tetrachloride (CCl _4 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 CCl _4 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 CCl _4 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.
Current sources of carbon tetrachloride (CCl4) in our atmosphere
Carbon tetrachloride (CCl _4 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 CCl _4 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 CCl _4 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.
Current sources of carbon tetrachloride (CCl4) in our atmosphere
David Sherry (Autor:in) / Archie McCulloch (Autor:in) / Qing Liang (Autor:in) / Stefan Reimann (Autor:in) / Paul A Newman (Autor:in)
2018
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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