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| Home > Publications database > Stratospheric carbon isotope fractionation and tropospheric histories of CFC-11, CFC-12 and CFC-113 isotopologues > print |
| 001 | 892382 | ||
| 005 | 20240712100905.0 | ||
| 024 | 7 | _ | |2 doi |a 10.5194/acp-2020-843 |
| 024 | 7 | _ | |2 Handle |a 2128/27764 |
| 037 | _ | _ | |a FZJ-2021-02043 |
| 082 | _ | _ | |a 550 |
| 100 | 1 | _ | |0 P:(DE-HGF)0 |a Thomas, Max |b 0 |
| 245 | _ | _ | |a Stratospheric carbon isotope fractionation and tropospheric histories of CFC-11, CFC-12 and CFC-113 isotopologues |
| 260 | _ | _ | |a Katlenburg-Lindau |b EGU |c 2020 |
| 336 | 7 | _ | |2 DRIVER |a article |
| 336 | 7 | _ | |2 DataCite |a Output Types/Journal article |
| 336 | 7 | _ | |0 PUB:(DE-HGF)16 |2 PUB:(DE-HGF) |a Journal Article |b journal |m journal |s 1620646335_30751 |
| 336 | 7 | _ | |2 BibTeX |a ARTICLE |
| 336 | 7 | _ | |2 ORCID |a JOURNAL_ARTICLE |
| 336 | 7 | _ | |0 0 |2 EndNote |a Journal Article |
| 520 | _ | _ | |a We present novel measurements of the carbon isotope composition of CFC-11 (CCl3F), CFC-12 (CCl2F2), and CFC-113 (CF2ClCFCl2), three atmospheric trace gases that are important for both stratospheric ozone depletion and global warming. These measurements were carried out on air samples collected in the stratosphere – the main sink region for these gases – and on air extracted from deep polar firn snow. We quantify, for the first time, the apparent isotopic fractionation, εapp(13C), for these gases as they are destroyed in the high- and mid-latitude stratosphere: εapp(CFC-12, high-lat) = (−20.2 ± 4.4) ‰ and εapp(CFC-113, high-lat) = (−9.4 ± 4.4) ‰, εapp(CFC-12, mid-lat) = (−30.3 ± 10.7) ‰, and εapp(CFC-113, mid-lat) = (−34.4 ± 9.8) ‰. Our CFC-11 measurements were not sufficient to calculate εapp(CFC-11) so we instead used previously reported photolytic fractionation for CFC-11 and CFC-12 to scale our εapp(CFC-12), resulting in εapp(CFC-11, high-lat) = (−7.8 ± 1.7) ‰ and εapp(CFC-11, mid-lat) = (−11.7 ± 4.2) ‰. Measurements of firn air were used to construct histories of the tropospheric isotopic composition, δT(13C), for CFC-11 (1950s to 2009), CFC-12 (1950s to 2009), and CFC-113 (1970s to 2009) – with δT(13C) increasing for each gas. We used εapp(high-lat), which were derived from more data, and a constant isotopic composition of emissions, δE(13C), to model δT(13C, CFC-11), δT(13C, CFC-12), and δT(13C, CFC-113). For CFC-11 and CFC-12, modelled δT(13C) was consistent with measured δT(13C) for the entire period covered by the measurements, suggesting no dramatic change in δE(13C, CFC-11) or δE(13C, CFC-12) has occurred since the 1950s. For CFC-113, our modelled δT(13C, CFC-113) did not agree with our measurements earlier than 1980. While this discrepancy may be indicative of a change in δE(13C, CFC-113), it is premature to assign one. Our modelling predicts increasing δT(13C, CFC-11), δT(13C, CFC-12), and δT(13C, CFC-113) into the future. We investigated the effect of recently reported new CFC-11 emissions on background δT(13C, CFC-11) by fixing model emissions after 2012, and comparing δT(13C, CFC-11) in this scenario to the model base case. The difference in δT(13C, CFC-11) between these scenarios was 1.4 ‰ in 2050. This difference is smaller than our model uncertainty envelope and would therefore require improved modelling and measurement precision, as well as better quantified isotopic source compositions, to detect. |
| 536 | _ | _ | |0 G:(DE-HGF)POF3-244 |a 244 - Composition and dynamics of the upper troposphere and middle atmosphere (POF3-244) |c POF3-244 |f POF III |x 0 |
| 536 | _ | _ | |0 G:(EU-Grant)678904 |a EXC3ITE - EXploring Chemistry, Composition and Circulation in the stratosphere with InnovativeTEchnologies (678904) |c 678904 |f ERC-2015-STG |x 1 |
| 588 | _ | _ | |a Dataset connected to CrossRef |
| 700 | 1 | _ | |0 P:(DE-Juel1)177681 |a Laube, Johannes C. |b 1 |e Corresponding author |
| 700 | 1 | _ | |0 0000-0002-1553-4043 |a Kaiser, Jan |b 2 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Allin, Samuel |b 3 |
| 700 | 1 | _ | |0 0000-0002-6820-2296 |a Martinerie, Patricia |b 4 |
| 700 | 1 | _ | |0 0000-0002-5372-8148 |a Mulvaney, Robert |b 5 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Ridley, Anna |b 6 |
| 700 | 1 | _ | |0 0000-0002-6688-8968 |a Röckmann, Thomas |b 7 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Sturges, William T. |b 8 |
| 700 | 1 | _ | |0 P:(DE-HGF)0 |a Witrant, Emmanuel |b 9 |
| 773 | _ | _ | |0 PERI:(DE-600)2069857-4 |a https://doi.org/10.5194/acp-2020-843 |p 843 |t Atmospheric chemistry and physics / Discussions |v 2020 |x 1680-7367 |y 2020 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/892382/files/acp-2020-843.pdf |y OpenAccess |
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