Variations in global methane sources and sinks during 1910–2010

Ghosh, A.; Patra, P. K.; Ishijima, K.; Umezawa, T.; Ito, A.; Etheridge, D. M.; Sugawara, S.; Kawamura, K.; Miller, J. B.; Dlugokencky, E. J.; Krummel, P. B.; Fraser, P. J.; Steele, L. P.; Langenfelds, R. L.; Trudinger, C. M.; White, J. W. C.; Vaughn, B.; Saeki, T.; Aoki, S.; Nakazawa, T.

doi:https://doi.org/10.5194/acp-15-2595-2015

Articles | Volume 15, issue 5

Atmos. Chem. Phys., 15, 2595–2612, 2015

https://doi.org/10.5194/acp-15-2595-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Atmos. Chem. Phys., 15, 2595–2612, 2015

https://doi.org/10.5194/acp-15-2595-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 15, issue 5

Research article 09 Mar 2015

Research article | 09 Mar 2015

Variations in global methane sources and sinks during 1910–2010

A. Ghosh et al.

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Final revised paper (published on 09 Mar 2015)
Supplement to the final revised paper
Preprint (discussion started on 05 Nov 2014)

Interactive discussion

Status: closed

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

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- Supplement

RC C9836: 'Review of, Ghosh, et al, 'Variations in global methane sources and sinks during 1910-2010’', Anonymous Referee #1, 06 Dec 2014
- AC C11758: 'reply to reviewer 1', Prabir Patra, 01 Feb 2015
RC C9964: 'Review of the paper by Ghosh et al.', Anonymous Referee #2, 09 Dec 2014
- AC C12093: 'reply to reviewer 2', Prabir Patra, 10 Feb 2015

Peer-review completion

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

AR by Anna Wenzel on behalf of the Authors (18 Feb 2015) Author's response Manuscript

ED: Publish as is (24 Feb 2015) by Martin Heimann

Short summary

Atmospheric CH4 increased from 900ppb to 1800ppb during the period 1900–2010 at a rate unprecedented in any observational records. We use bottom-up emissions and a chemistry-transport model to simulate CH4. The optimized global total CH4 emission, estimated from the model–observation differences, increased at fastest rate during 1940–1990. Using δ13C of CH4 measurements we attribute this emission increase to biomass burning. Total CH4 lifetime is shortened by 4% over the simulation period.