On the regional and seasonal ozone depletion potential of chlorinated very short-lived substances

Claxton, Tom and Hossaini, Ryan and Wild, Oliver and Chipperfield, Martyn and Wilson, Chris (2019) On the regional and seasonal ozone depletion potential of chlorinated very short-lived substances. Geophysical Research Letters, 46 (10). pp. 5489-5498. ISSN 0094-8276

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Abstract

Chloroform (CHCl3), dichloromethane (CH2Cl2), perchloroethylene (C2Cl4) and 1,2-dichloroethane (C2H4Cl2) are chlorinated Very Short-Lived Substances (Cl-VSLS) with a range of commercial/industrial applications. Recent studies highlight the increasing influence of Cl-VSLS on the stratospheric chlorine budget and therefore their possible role in ozone depletion. Here, we evaluate the ozone depletion potential (ODP) of these Cl-VSLS using a three-dimensional chemical transport model and investigate sensitivity to emission location/season. The seasonal dependence of the ODPs is small but ODPs vary by a factor of 2-3 depending on the continent of emission: 0.0143-0.0264 (CHCl3), 0.0097-0.0208 (CH2Cl2), 0.0057-0.0198 (C2Cl4) and 0.0029-0.0119 (C2H4Cl2). Asian emissions produce the largest ODPs owing to proximity to the tropics and efficient troposphere-to-stratosphere transport of air originating from industrialised East Asia. The Cl-VSLS ODPs are generally small but the upper ends of the CHCl3 and CH2Cl2 ranges are comparable to the mean ODP of methyl chloride (0.02), a longer-lived ozone-depleting substance.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Research Letters
Additional Information:
An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union. Claxton, T., Hossaini, R., Wild, O., Chipperfield, M. P., & Wilson, C. ( 2019). On the regional and seasonal ozone depletion potential of chlorinated very short‐lived substances. Geophysical Research Letters, 46. https://doi.org/10.1029/2018GL081455 To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
133254
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Deposited On:
29 Apr 2019 16:27
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Sep 2020 04:32