Rapid increase in ozone-depleting chloroform emissions from China

TitleRapid increase in ozone-depleting chloroform emissions from China
Publication TypeJournal Article
Year of Publication2019
AuthorsFang X.K, Park S., Saito T., Tunnicliffe R., Ganesan A.L, Rigby M, Li S.L, Yokouchi Y., Fraser PJ, Harth CM, Krummel PB, Mühle J, O'Doherty S, Salameh PK, Simmonds PG, Weiss RF, Young D, Lunt M.F, Manning A.J, Gressentl A., Prinn RG
JournalNature Geoscience
Volume12
Pagination89-+
Date Published2019/02
Type of ArticleArticle
ISBN Number1752-0894
Accession NumberWOS:000457194900006
Keywordsbromine; budget; dispersion model flexpart; Geology; in-situ measurements; layer; pollution; short-lived substances; stratospheric ozone; transport; trends
Abstract

Chloroform contributes to the depletion of the stratospheric ozone layer. However, due to its short lifetime and predominantly natural sources, it is not included in the Montreal Protocol that regulates the production and uses of ozone-depleting substances. Atmospheric chloroform mole fractions were relatively stable or slowly decreased during 1990-2010. Here we show that global chloroform mole fractions increased after 2010, based on in situ chloroform measurements at seven stations around the world. We estimate that the global chloroform emissions grew at the rate of 3.5% yr(-1) between 2010 and 2015 based on atmospheric model simulations. We used two regional inverse modelling approaches, combined with observations from East Asia, to show that emissions from eastern China grew by 49 (41-59) Gg between 2010 and 2015, a change that could explain the entire increase in global emissions. We suggest that if chloroform emissions continuously grow at the current rate, the recovery of the stratospheric ozone layer above Antarctica could be delayed by several years.

DOI10.1038/s41561-018-0278-2
Short TitleNat. Geosci.
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