A growing threat to the ozone layer from short-lived anthropogenic chlorocarbons

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dc.contributor.authorOram, David E.
dc.contributor.authorAshfold, Matthew J.
dc.contributor.authorLaube, Johannes C.
dc.contributor.authorGooch, Lauren J.
dc.contributor.authorHumphrey, Stephen
dc.contributor.authorSturges, William T.
dc.contributor.authorLeedham-Elvidge, Emma
dc.contributor.authorForster, Grant L.
dc.contributor.authorHarris, Neil R. P.
dc.contributor.authorIqbal Mead, Mohammed
dc.contributor.authorSamah, Azizan Abu
dc.contributor.authorPhang, Siew-Moi
dc.contributor.authorOu-Yang, Chang-Feng
dc.contributor.authorLin, Neng-Huei
dc.contributor.authorWang, Jia-Lin
dc.contributor.authorBaker, Angela K.
dc.contributor.authorBrenninkmeijer, Carl A. M.
dc.contributor.authorSherry, David
dc.date.accessioned2017-11-07T15:05:21Z
dc.date.available2017-11-07T15:05:21Z
dc.date.issued2017-10-12
dc.description.abstractLarge and effective reductions in emissions of long-lived ozone-depleting substance (ODS) are being achieved through the Montreal Protocol, the effectiveness of which can be seen in the declining atmospheric abundances of many ODSs. An important remaining uncertainty concerns the role of very short-lived substances (VSLSs) which, owing to their relatively short atmospheric lifetimes (less than 6 months), are not regulated under the Montreal Protocol. Recent studies have found an unexplained increase in the global tropospheric abundance of one VSLS, dichloromethane (CH2Cl2), which has increased by around 60% over the past decade. Here we report dramatic enhancements of several chlorine-containing VSLSs (Cl-VSLSs), including CH2Cl2 and CH2ClCH2Cl (1,2-dichloroethane), observed in surface and upper-tropospheric air in East and South East Asia. Surface observations were, on occasion, an order of magnitude higher than previously reported in the marine boundary layer, whilst upper-tropospheric data were up to 3 times higher than expected. In addition, we pro-vide further evidence of an atmospheric transport mechanism whereby substantial amounts of industrial pollution from East Asia, including these chlorinated VSLSs, can rapidly, and regularly, be transported to tropical regions of the western Pacific and subsequently uplifted to the tropical upper troposphere. This latter region is a major provider of air entering the stratosphere, and so this mechanism, in conjunction with increasing emissions of Cl-VSLSs from East Asia, could potentially slow the expected recovery of stratospheric ozone.en_UK
dc.identifier.citationOram DE, Ashfold MJ, Laube JC, et al., (2017) A growing threat to the ozone layer from short-lived anthropogenic chlorocarbons. Atmospheric Chemistry and Physics, Volume 17, October 2017, 11929-11941en_UK
dc.identifier.cris18813397
dc.identifier.issn1680-7316
dc.identifier.urihttp://dx.doi.org/10.5194/acp-17-11929-2017
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/12703
dc.language.isoenen_UK
dc.publisherEuropean Geosciences Union (EGU) / Copernicus Publicationsen_UK
dc.rightsAttribution 3.0 Unported
dc.rightshttps://creativecommons.org/licenses/by/3.0/
dc.titleA growing threat to the ozone layer from short-lived anthropogenic chlorocarbonsen_UK
dc.typeArticleen_UK

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