Preprints
https://doi.org/10.5194/egusphere-2022-485
https://doi.org/10.5194/egusphere-2022-485
20 Jun 2022
 | 20 Jun 2022

Carbon emission and export from Ket River, western Siberia

Artem G. Lim, Ivan V. Krickov, Sergey N. Vorobyev, Mikhail Korets, Sergey Kopysov, Liudmila S. Shirokova, Jan Karlsson, and Oleg S. Pokrovsky

Abstract. Despite recent progress in the understanding of the carbon (C) cycle of Siberian permafrost-affected rivers, spatial and seasonal dynamics of C export and emission from medium-size rivers remain poorly unknown. Here we studied one of the largest tributaries of the Ob River, the Ket River (watershed = 94,000 km2) which drains through virtually pristine dense taiga forest of the boreal zone in western Siberian Lowland (WSL). We combined continuous in-situ measurements of carbon dioxide (CO2) concentration and flux (FCO2), with methane (CH4), organic and inorganic C (DOC and DIC, respectively), particulate organic C and total bacterial concentrations over a 834-km transect of the Ket River main stem and its 26 tributaries during spring flood and 12 tributaries during summer baseflow. The CO2 concentration was lower and less variable in the main stem (2000 to 2500 µatm) compared to that in tributaries (2000 to 5000 µatm). The methane concentrations in the main stem and tributaries was a factor of 300 to 1900 (flood period) and 100 to 150 (baseflow period) lower than that of CO2. The FCO2 ranged from 0.4 to 2.4 g C m-2 d-1 in the main channel and from 0.5 to 5.0 g C m-2 d-1 in the tributaries, being the highest during August in tributaries and weakly dependent on season in the main channel. Only during summer baseflow, the DOM aromaticity, bacterial number, and needleleaf forest coverage of the watershed positively affected CO2 concentrations and fluxes. We hypothesize that the relatively low variability in FCO2 is due to flat homogeneous (bog and taiga forest) landscape that results in long water residence times and stable input of allochthonous DOM, which dominate the FCO2. In summer baseflow, the DIC input from deeper flow paths might also contribute to CO2 emission. The open water period (May to October) C emission from the Ket River basin was estimated to 127±11 Gg C y-1 which is lower than the lateral C export during the same period. Although this estimated C emissions contain uncertainties, stressing the need of better constrained FCO2 and water coverage across seasons, we considered it conservative which emphasize the important role of WSL rivers for release of CO2 to the atmosphere.

Journal article(s) based on this preprint

19 Dec 2022
Carbon emission and export from the Ket River, western Siberia
Artem G. Lim, Ivan V. Krickov, Sergey N. Vorobyev, Mikhail A. Korets, Sergey Kopysov, Liudmila S. Shirokova, Jan Karlsson, and Oleg S. Pokrovsky
Biogeosciences, 19, 5859–5877, https://doi.org/10.5194/bg-19-5859-2022,https://doi.org/10.5194/bg-19-5859-2022, 2022
Short summary

Artem G. Lim et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-485', Anonymous Referee #1, 26 Jul 2022
    • AC1: 'Reply on RC1', O.S. Pokrovsky, 05 Aug 2022
  • RC2: 'Comment on egusphere-2022-485', Anonymous Referee #2, 30 Sep 2022
    • AC2: 'Reply on RC2', O.S. Pokrovsky, 10 Oct 2022
  • RC3: 'Comment on egusphere-2022-485', Anonymous Referee #3, 04 Oct 2022
    • AC3: 'Reply on RC3', O.S. Pokrovsky, 10 Oct 2022

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-485', Anonymous Referee #1, 26 Jul 2022
    • AC1: 'Reply on RC1', O.S. Pokrovsky, 05 Aug 2022
  • RC2: 'Comment on egusphere-2022-485', Anonymous Referee #2, 30 Sep 2022
    • AC2: 'Reply on RC2', O.S. Pokrovsky, 10 Oct 2022
  • RC3: 'Comment on egusphere-2022-485', Anonymous Referee #3, 04 Oct 2022
    • AC3: 'Reply on RC3', O.S. Pokrovsky, 10 Oct 2022

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (10 Oct 2022) by Gwenaël Abril
AR by O.S. Pokrovsky on behalf of the Authors (12 Oct 2022)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (12 Oct 2022) by Gwenaël Abril
RR by Anonymous Referee #3 (13 Oct 2022)
RR by Anonymous Referee #1 (24 Oct 2022)
ED: Reconsider after major revisions (31 Oct 2022) by Gwenaël Abril
AR by O.S. Pokrovsky on behalf of the Authors (14 Nov 2022)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (23 Nov 2022) by Gwenaël Abril
RR by Anonymous Referee #3 (23 Nov 2022)
ED: Publish as is (01 Dec 2022) by Gwenaël Abril
AR by O.S. Pokrovsky on behalf of the Authors (01 Dec 2022)

Journal article(s) based on this preprint

19 Dec 2022
Carbon emission and export from the Ket River, western Siberia
Artem G. Lim, Ivan V. Krickov, Sergey N. Vorobyev, Mikhail A. Korets, Sergey Kopysov, Liudmila S. Shirokova, Jan Karlsson, and Oleg S. Pokrovsky
Biogeosciences, 19, 5859–5877, https://doi.org/10.5194/bg-19-5859-2022,https://doi.org/10.5194/bg-19-5859-2022, 2022
Short summary

Artem G. Lim et al.

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
In order to quantify C transport and emission and main environmental factors controlling the C cycle on Siberian rivers, we investigated the largest tributary of the Ob River, the Ket River basin, via measuring spatial and seasonal variations in CO2 and CH4 concentrations and emissions, together with hydrochemical analyses. The obtained results are useful for large scale modelling of C emission and export fluxes from permafrost-free boreal rivers of under-represented region of the world.