Articles | Volume 19, issue 22
© Author(s) 2022. This work is distributed underthe Creative Commons Attribution 4.0 License.
Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany's largest drinking water reservoir
- Final revised paper (published on 24 Nov 2022)
- Supplement to the final revised paper
- Preprint (discussion started on 19 Jul 2022)
- Supplement to the preprint
Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor |
: Report abuse
RC1: 'Comment on bg-2022-154', Anonymous Referee #1, 14 Aug 2022
- AC1: 'Reply on RC1', Marlene Dordoni, 24 Aug 2022
RC2: 'Comment on bg-2022-154', Anonymous Referee #2, 16 Aug 2022
- AC2: 'Reply on RC2', Marlene Dordoni, 24 Aug 2022
Peer review completion
AR: Author's response | RR: Referee report | ED: Editor decision
ED: Reconsider after major revisions (02 Sep 2022) by Sebastian Naeher
AR by Marlene Dordoni on behalf of the Authors (29 Sep 2022)  Author's response Author's tracked changes Manuscript
ED: Referee Nomination & Report Request started (02 Oct 2022) by Sebastian Naeher
RR by Anonymous Referee #1 (05 Oct 2022)
RR by Anonymous Referee #2 (24 Oct 2022)
ED: Publish subject to technical corrections (28 Oct 2022) by Sebastian Naeher
AR by Marlene Dordoni on behalf of the Authors (03 Nov 2022)  Author's response Manuscript
Review of Dordoni et al. “Mineralization of autochthonous particulate organic carbon is a fast channel of organic matter turnover in Germany’s largest drinking water reservoir”
The central focus of this manuscript is to investigate the preferential turnover of different carbon phases into DIC in the Rappbode Reservoir in Germany. For this aim, the authors analyzed 13C and concentration of DOC, autochthonous and allochthonous POC, sedimentary OC and DIC in different seasons. Based on variations in 13C and concentration among different carbon phases, the authors used an isotope mass balance to calculate potential C-contribution of OM to DIC pool and compared it to DIC concentration changes to determine most plausible source of OM turnover in metalimnion and hypolimnion. The authors found that autochthonous POC is main contributor to DIC increases and further calculated its turnover rate to be 0.01 to 1.3 μmol L-1 d-1, within the range for oligotrophic water bodies.
Overall, this is well-organized and clearly written manuscript. The data, discussion and conclusion are intuitive for the most part. That said, I do have some minor to moderate comments and suggestions that I think will improve the manuscript. I outline these below, with line numbers where appropriate. Once these changes have been made, I fully support publication of the manuscript in Biogeosciences.
L12-13: It may be better to use “phases” instead of “sources” here. Some abbreviation seem to make me confusing, e.g., POC and ExtPOC. Could the authors just use “auto-POC” and “allo-POC” to name these two differently-sourced POC.
L14-16: I am confused about which is the “this purpose”. Does it refer to the first sentence of the Abstract? Could the authors change it to “For eliminating the influence of atmospheric exchange, we …….” ? Also, the Abstract could be improved to be more concise and logically clearer.
L32: In the introduction part, a description of characterization of metalimnion and hypolimnion seems missing, because CO2 exchanges from atmosphere and soil are also important sources of DIC.
L110: The description of d13C could be simplified, as it is a basic parameter to the audience in this field.
L130: Instead, the isotope mass model could be explained in more details, e.g., how the equation (2) was deducedï¼The variations of d13CDOC and d13CPOC should be plotted in the main text, as they are important for the manuscript.
L175: The Results part looks very discrete with 6 paragraphs, even some paragraphs are only composed of 3-4 sentences. Please revise the part to be more simplified and concise.
L231: Please add several sub-titles to discussion part to make it more readable.