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dc.contributor.authorClaxton, Tom
dc.contributor.authorHossaini, R.
dc.contributor.authorWilson, C.
dc.contributor.authorMontzka, Stephen A.
dc.contributor.authorChipperfield, Martyn P.
dc.contributor.authorWild, Oliver
dc.contributor.authorBednarz, Ewa M.
dc.contributor.authorCarpenter, Lucy J.
dc.contributor.authorAndrews, Stephen J.
dc.contributor.authorHackenberg, Sina C.
dc.contributor.authorMühle, Jens
dc.contributor.authorOram, David
dc.contributor.authorPark, Sunyoung
dc.contributor.authorPark, Mi-Kyung
dc.contributor.authorAtlas, Elliot
dc.contributor.authorNavarro, Maria
dc.contributor.authorSchauffler, Sue
dc.contributor.authorSherry, David
dc.contributor.authorVollmer, Martin K.
dc.contributor.authorSchuck, Tanja
dc.contributor.authorEngel, Andreas
dc.contributor.authorKrummel, Paul B.
dc.contributor.authorMaione, Michela
dc.contributor.authorArduini, Jgor
dc.contributor.authorSaito, Takuya
dc.contributor.authorYokouchi, Yoko
dc.contributor.authorO'Doherty, Simon
dc.contributor.authorYoung, Dickon
dc.contributor.authorLunder, Chris Rene
dc.identifier.citationJournal of Geophysical Research (JGR): Atmospheres. 2020, 125, e2019JD031818.en_US
dc.description.abstractDichloromethane (CH2Cl2) and perchloroethylene (C2Cl4) are chlorinated very short lived substances (Cl‐VSLS) with anthropogenic sources. Recent studies highlight the increasing influence of such compounds, particularly CH2Cl2, on the stratospheric chlorine budget and therefore on ozone depletion. Here, a multiyear global‐scale synthesis inversion was performed to optimize CH2Cl2 (2006–2017) and C2Cl4 (2007–2017) emissions. The approach combines long‐term surface observations from global monitoring networks, output from a three‐dimensional chemical transport model (TOMCAT), and novel bottom‐up information on prior industry emissions. Our posterior results show an increase in global CH2Cl2 emissions from 637 ± 36 Gg yr−1 in 2006 to 1,171 ± 45 Gg yr−1 in 2017, with Asian emissions accounting for 68% and 89% of these totals, respectively. In absolute terms, Asian CH2Cl2 emissions increased annually by 51 Gg yr−1 over the study period, while European and North American emissions declined, indicating a continental‐scale shift in emission distribution since the mid‐2000s. For C2Cl4, we estimate a decrease in global emissions from 141 ± 14 Gg yr−1 in 2007 to 106 ± 12 Gg yr−1 in 2017. The time‐varying posterior emissions offer significant improvements over the prior. Utilizing the posterior emissions leads to modeled tropospheric CH2Cl2 and C2Cl4 abundances and trends in good agreement to those observed (including independent observations to the inversion). A shorter C2Cl4 lifetime, from including an uncertain Cl sink, leads to larger global C2Cl4 emissions by a factor of ~1.5, which in some places improves model‐measurement agreement. The sensitivity of our findings to assumptions in the inversion procedure, including CH2Cl2 oceanic emissions, is discussed.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleA Synthesis Inversion to Constrain Global Emissions of Two Very Short Lived Chlorocarbons: Dichloromethane, and Perchloroethyleneen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder©2020. The Authors.en_US
dc.source.journalJournal of Geophysical Research (JGR): Atmospheresen_US
dc.relation.projectNILU - Norsk institutt for luftforskning: 121002en_US

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