Comparison of OCO-2 target observations to MUCCnet – is it possible to capture urban XCO2 gradients from space?

Rißmann, Maximilian; Chen, Jia; Osterman, Gregory; Zhao, Xinxu; Dietrich, Florian; Makowski, Moritz; Hase, Frank; Kiel, Matthäus

doi:https://doi.org/10.5194/amt-15-6605-2022

Articles | Volume 15, issue 22

https://doi.org/10.5194/amt-15-6605-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-15-6605-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 15, issue 22

Research article

|

17 Nov 2022

Research article |

| 17 Nov 2022

Comparison of OCO-2 target observations to MUCCnet – is it possible to capture urban X_CO₂ gradients from space?

Maximilian Rißmann, Jia Chen, Gregory Osterman, Xinxu Zhao, Florian Dietrich, Moritz Makowski, Frank Hase, and Matthäus Kiel

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Final revised paper (published on 17 Nov 2022)
Preprint (discussion started on 19 May 2022)

Interactive discussion

Status: closed

RC1:
'Review of amt-2022-71', Christopher O'Dell, 27 May 2022

See supplementary PDF document containing review.

Citation: https://doi.org/10.5194/amt-2022-71-RC1
- AC2: 'Reply on RC1', Maximilian Rißmann, 21 Jul 2022
  
  Dear Christopher O'Dell,
  
  We are very grateful for your comments and suggestions, which have helped to improve our
  
  manuscript significantly. We have revised the manuscript accordingly. Attached you can find a point to point response
  
  to your comments and suggestions. Corresponding changes in the manuscript are also made available in the attached file, if applicable.
  
  Sincerely,
  
  Maximilian Rißmann and Jia Chen on behalf of all co-authors.
  
  Citation: https://doi.org/10.5194/amt-2022-71-AC2
RC2:
'Comment on amt-2022-71', Anonymous Referee #1, 10 Jun 2022

The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2022-71/amt-2022-71-RC2-supplement.pdf

Citation: https://doi.org/10.5194/amt-2022-71-RC2
- AC1: 'Reply on RC2', Maximilian Rißmann, 21 Jul 2022
  
  Dear reviewer,
  
  We are very grateful for your comments and suggestions, which have helped to improve our
  
  manuscript significantly. We have revised the manuscript accordingly. Attached you can find a point to point response
  
  to your comments and suggestions. Corresponding changes in the manuscript are also made available in the attached file, if applicable.
  
  Sincerely,
  
  Maximilian Rißmann and Jia Chen on behalf of all co-authors.
  
  Citation: https://doi.org/10.5194/amt-2022-71-AC1
RC3:
'Comment on amt-2022-71', Anonymous Referee #2, 21 Jun 2022
Subject: Review of “Comparison of OCO-2 target observations to MUCCnet - Is it possible to capture urban XCO2 gradients from space?”

General comments:

This manuscript presents a comparison of Orbiting Carbon Observatory-2 (OCO-2) XCO2 against ground-based XCO2 from EM27/SUN spectrometers which are part of the Munich Urban Carbon Column network (MUCCnet). The paper quantifies for the first time the XCO2 gradient within one OCO-2 target observation. During the measurement period enhancements in the range of 0.1 to 1 ppm are reported. This shows the potential of OCO-2 data (space-based) for accurately capturing small-scale CO2 gradient. The paper is well-written. I recommend it for the AMT publication with some minor additions as outlined below.

Colocation criteria: I have some concerns about the time selection of +/- 30 min. It seems to be too long especially when looking at gradient signals between closely located sites (< 10 km). Rather there should be a good compromise between the colocation geometry and the time. To motivate the choice made by the authors a sensitivity study for one selected day (with highest wind speed) would help.

L88: Reference Frey and Gisi, 2021 is not correctly labeled / missing doi or link?

L131: should be “starting from April, 2020”
Citation: https://doi.org/10.5194/amt-2022-71-RC3
- AC3: 'Reply on RC3', Maximilian Rißmann, 21 Jul 2022
 
 Dear reviewer,
 
 We are very grateful for your comments and suggestions, which have helped to improve our
 
 manuscript significantly. We have revised the manuscript accordingly. Attached you can find a point to point response
 
 to your comments and suggestions. Corresponding changes in the manuscript are also made available in the attached file, if applicable.
 
 Sincerely,
 
 Maximilian Rißmann and Jia Chen on behalf of all co-authors.
 
 Citation: https://doi.org/10.5194/amt-2022-71-AC3

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload

AR by Maximilian Rißmann on behalf of the Authors (26 Aug 2022) Author's response Author's tracked changes Manuscript

ED: Referee Nomination & Report Request started (29 Aug 2022) by Joanna Joiner

RR by Anonymous Referee #1 (30 Aug 2022)

RR by Christopher O'Dell (31 Aug 2022)

ED: Publish subject to minor revisions (review by editor) (02 Sep 2022) by Joanna Joiner

AR by Maximilian Rißmann on behalf of the Authors (23 Sep 2022) Author's response Author's tracked changes Manuscript

ED: Publish subject to technical corrections (23 Sep 2022) by Joanna Joiner

AR by Maximilian Rißmann on behalf of the Authors (26 Sep 2022) Author's response Manuscript

Short summary

The Orbiting Carbon Observatory 2 (OCO-2) measures atmospheric concentrations of the most potent greenhouse gas, CO₂, globally. By comparing its measurements to a ground-based monitoring network in Munich (MUCCnet), we find that the satellite is able to reliably detect urban CO₂ concentrations. Furthermore, spatial CO₂ differences captured by OCO-2 and MUCCnet are strongly correlated, which indicates that OCO-2 could be helpful in determining urban CO₂ emissions from space.