Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1138
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
10 Jan 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Proxies and uncertainties for 13C/12C ratios of atmospheric reactive gases emissions
Sergey Gromov1,2, Carl A. M. Brenninkmeijer1, and Patrick Jöckel3 1Max Planck Institute for Chemistry, Mainz
2Institute of Global Climate and Ecology (Roshydromet and RAS), Moscow
3Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Weßling
Abstract. We provide a comprehensive review of the proxy data on the 13C/12C ratios and uncertainties of emissions of reactive carbonaceous compounds into the atmosphere, with a focus on CO sources. Based on an evaluated setup of the EMAC model, we derive the isotope-resolved dataset of its emission inventory for the 1997–2005 period. Additionally, we revisit the calculus required for the correct derivation of uncertainties associated with isotope ratios of emission fluxes. The resulting overall surface CO emission δ13C in 2000 of −(25.2 ± 0.7) ‰ is in line with the previous bottom-up estimates and a factor of two less uncertain. In contrast to this, we find that uncertainties of the respective inverse modelling estimates are substantially larger due to the correlated nature of their derivation. We reckon the δ13C values of surface emissions of higher hydrocarbons being within −24 ‰ to −27 ‰ (uncertainty typically below ±1 ‰), with an exception of isoprene emissions being close to −30 ‰. The isotope signature of ethane surface emission coincides with earlier estimates, however integrating very different source inputs. δ13C values are reported relative to V-PDB.

Citation: Gromov, S., Brenninkmeijer, C. A. M., and Jöckel, P.: Proxies and uncertainties for 13C/12C ratios of atmospheric reactive gases emissions, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1138, in review, 2017.
Sergey Gromov et al.
Sergey Gromov et al.
Sergey Gromov et al.

Viewed

Total article views: 223 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
170 38 15 223 5 15

Views and downloads (calculated since 10 Jan 2017)

Cumulative views and downloads (calculated since 10 Jan 2017)

Viewed (geographical distribution)

Total article views: 223 (including HTML, PDF, and XML)

Thereof 222 with geography defined and 1 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 28 Mar 2017
Publications Copernicus
Download
Short summary
We revisit the proxies/uncertainties for the 13C/12C ratios of emissions of reactive C into the atmosphere. Our main findings/results are: (i) A factor of 2 less uncertain estimate of tropospheric CO surface sources δ13C, (ii) A confirmed disagreement between the bottom-up and top-down 13CO-inclusive emission estimates, and (iii) A novel estimate of the δ13C signatures of a range of NMHCs/VOCs to be used in modelling studies. Results are based on the EMAC model emission setup evaluated for 2000.
We revisit the proxies/uncertainties for the 13C/12C ratios of emissions of reactive C into the...
Share