Articles | Volume 19, issue 21
© Author(s) 2022. This work is distributed underthe Creative Commons Attribution 4.0 License.
Highest methane concentrations in an Arctic river linked to local terrestrial inputs
- Final revised paper (published on 04 Nov 2022)
- Supplement to the final revised paper
- Preprint (discussion started on 29 Jun 2022)
- Supplement to the preprint
Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor |
: Report abuse
RC1: 'Comment on bg-2022-135', Anonymous Referee #1, 22 Jul 2022
- AC1: 'Reply on RC1', Karel Castro-Morales, 19 Sep 2022
RC2: 'Comment on bg-2022-135', Anonymous Referee #2, 12 Aug 2022
- AC2: 'Reply on RC2', Karel Castro-Morales, 19 Sep 2022
Peer review completion
AR: Author's response | RR: Referee report | ED: Editor decision
ED: Publish subject to minor revisions (review by editor) (24 Sep 2022) by Alexey V. Eliseev
AR by Karel Castro-Morales on behalf of the Authors (07 Oct 2022)  Author's response Author's tracked changes Manuscript
ED: Publish as is (10 Oct 2022) by Alexey V. Eliseev
The article considers an extremely important phenomenon – the entry of methane into the water mass of the Arctic river from its catchment area. It is shown that methane is distributed inhomogeneously in the transverse direction, its highest content is characteristic of coastal areas. This work opens up the direction of research necessary to assess the flow of methane into the coastal zone of water bodies during the melting of permafrost. A large number of studied indicators gives grounds to confirm the results obtained. The conclusion seems to be important that a considered fraction of CH4 is already oxidized within the recently thawed active layer.
From the comments on the work, the following should be mentioned. Dissolved organic carbon is among the studied indicators. Why do the authors use this indicator, and not the total organic carbon, which seems more correct, since organic suspension can be a carbon source for methanogens? The second remark concerns the authors' conclusion that the upstream river sections are not a source of CH4 entering the Arctic Ocean by transferring downstream with river runoff. It is possible that this is the case in low-water phases, and during the period of maximum flood flow, the time of water reaching can be significantly reduced. The study of the length of the river section from which methane enters the mouth in various phases of the water regime was not included in the list of research tasks, but this idea seems very relevant for further work. Another remark concerns the reference to Figure 7. The authors write: statistically significant correlation between methanogen abundance and methane concentration (Fig. 7). Figure 7 in the appendix shows other data.
Despite the above comments, the work seems to be very important and should certainly be published.