Interlaboratory comparison of δ13C and δD measurements of atmospheric CH4 for combined use of data sets from different laboratories

Umezawa, Taku; Brenninkmeijer, Carl A. M.; Röckmann, Thomas; van der Veen, Carina; Tyler, Stanley C.; Fujita, Ryo; Morimoto, Shinji; Aoki, Shuji; Sowers, Todd; Schmitt, Jochen; Bock, Michael; Beck, Jonas; Fischer, Hubertus; Michel, Sylvia E.; Vaughn, Bruce H.; Miller, John B.; White, James W. C.; Brailsford, Gordon; Schaefer, Hinrich; Sperlich, Peter; Brand, Willi A.; Rothe, Michael; Blunier, Thomas; Lowry, David; Fisher, Rebecca E.; Nisbet, Euan G.; Rice, Andrew L.; Bergamaschi, Peter; Veidt, Cordelia; Levin, Ingeborg

doi:https://doi.org/10.5194/amt-11-1207-2018

Articles | Volume 11, issue 2

Atmos. Meas. Tech., 11, 1207–1231, 2018

https://doi.org/10.5194/amt-11-1207-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Atmos. Meas. Tech., 11, 1207–1231, 2018

https://doi.org/10.5194/amt-11-1207-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 11, issue 2

Research article 02 Mar 2018

Research article | 02 Mar 2018

Interlaboratory comparison of δ¹³C and δD measurements of atmospheric CH₄ for combined use of data sets from different laboratories

Taku Umezawa et al.

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Final revised paper (published on 02 Mar 2018)
Preprint (discussion started on 09 Aug 2017)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

SC1: 'review comments', Sergey Assonov, 17 Oct 2017
- RC1: 'Review comments', Sergey Assonov, 19 Oct 2017
  - AC1: 'Response to referee Sergey Assonov', Taku Umezawa, 09 Dec 2017
RC2: 'amt-2017-281', Anonymous Referee #2, 26 Oct 2017
- AC2: 'Response to referee#2', Taku Umezawa, 09 Dec 2017

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Taku Umezawa on behalf of the Authors (04 Jan 2018) Author's response Manuscript

ED: Publish subject to minor revisions (review by editor) (10 Jan 2018) by Frank Keppler

AR by Taku Umezawa on behalf of the Authors (16 Jan 2018) Author's response Manuscript

ED: Publish as is (17 Jan 2018) by Frank Keppler

Short summary

Isotope measurements are useful for separating different methane sources. However, the lack of widely accepted standards and calibration methods for stable carbon and hydrogen isotopic ratios of methane in air has caused significant measurement offsets among laboratories. We conducted worldwide interlaboratory comparisons, surveyed the literature and assessed them systematically. This study may be of help in future attempts to harmonize data sets of isotopic composition of atmospheric methane.