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Rapid increase in ozone-depleting chloroform emissions from China

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)89-93
Number of pages5
JournalNature Geoscience
Volume12
Issue number2
Early online date21 Dec 2018
DOIs
DateAccepted/In press - 20 Nov 2018
DateE-pub ahead of print - 21 Dec 2018
DatePublished (current) - Feb 2019

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.

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Nature at https://www.nature.com/articles/s41561-018-0278-2 . Please refer to any applicable terms of use of the publisher.

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