The airborne chicago water isotope spectrometer: an integrated cavity output spectrometer for measurements of the HDO&thinsp;∕&thinsp;H<sub>2</sub>O isotopic ratio in the Asian Summer Monsoon

Clouser, Benjamin W.; Sarkozy, Laszlo C.; Singer, Clare E.; KleinStern, Carly C.; Desmoulin, Adrien; Gaeta, Dylan; Khaykin, Sergey; Gabbard, Stephen; Shertz, Stephen; Moyer, Elisabeth J.

doi:10.5194/amt-18-6465-2025

Articles | Volume 18, issue 21

https://doi.org/10.5194/amt-18-6465-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

StratoClim stratospheric and upper tropospheric processes...

https://doi.org/10.5194/amt-18-6465-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 21

Research article

| Highlight paper

|

12 Nov 2025

Research article | Highlight paper |

| 12 Nov 2025

The airborne chicago water isotope spectrometer: an integrated cavity output spectrometer for measurements of the HDO ∕ H₂O isotopic ratio in the Asian Summer Monsoon

Benjamin W. Clouser, Laszlo C. Sarkozy, Clare E. Singer, Carly C. KleinStern, Adrien Desmoulin, Dylan Gaeta, Sergey Khaykin, Stephen Gabbard, Stephen Shertz, and Elisabeth J. Moyer

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Final revised paper (published on 12 Nov 2025)
Supplement to the final revised paper
Preprint (discussion started on 18 Sep 2024)
Supplement to the preprint

Interactive discussion

Status: closed

RC1:
'Comment on amt-2024-98', Anonymous Referee #3, 24 Sep 2024

The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2024-98/amt-2024-98-RC1-supplement.pdf

Citation: https://doi.org/10.5194/amt-2024-98-RC1
- AC1: 'Reply on CC1', Benjamin Clouser, 23 Oct 2024
  
  Thank you for your comment, it is well-received. I debated dropping "in the Asian Summer Monsoon" from the title while preparing the manuscript, but ultimately decided to leave it. On one hand, the instrument was expressly designed to make measurements in the ASM during StratoClim, and made many hours of measurements of monsoon outflow during ACCLIP. On the other hand, from an operational standpoint, conditions in the Asian Monsoon upper troposphere / lower stratosphere are not very different from UT/LS conditions elsewhere so the title may be overly restricting. Maybe it would be better to replace "in the Asian Summer Monsoon" with "in the UT/LS". The coauthors and I will revisit this issue as we revise the manuscript.
  
  Citation: https://doi.org/10.5194/amt-2024-98-AC1
- AC2: 'Reply on RC1', Benjamin Clouser, 15 Apr 2025
  
  The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2024-98/amt-2024-98-AC2-supplement.pdf
  
  Citation: https://doi.org/10.5194/amt-2024-98-AC2
CC1:
'Comment on amt-2024-98', Farahnaz Khosrawi, 22 Oct 2024

You purely describe the instrument here and it is an instrument, as I understand, that is supposed to measure isotopic ratios everywhere in the world. You made your first measurements with this instrument in the Asian summer monsoon since it was the first opportunity where you could apply it. Thus, I would suggest to omit either "in the Asian Summer Monsoon" from the title or somehow make clear in the title that your first application was for measurements in the Asian summer monsoon.

Citation: https://doi.org/10.5194/amt-2024-98-CC1
- AC1: 'Reply on CC1', Benjamin Clouser, 23 Oct 2024
  
  Thank you for your comment, it is well-received. I debated dropping "in the Asian Summer Monsoon" from the title while preparing the manuscript, but ultimately decided to leave it. On one hand, the instrument was expressly designed to make measurements in the ASM during StratoClim, and made many hours of measurements of monsoon outflow during ACCLIP. On the other hand, from an operational standpoint, conditions in the Asian Monsoon upper troposphere / lower stratosphere are not very different from UT/LS conditions elsewhere so the title may be overly restricting. Maybe it would be better to replace "in the Asian Summer Monsoon" with "in the UT/LS". The coauthors and I will revisit this issue as we revise the manuscript.
  
  Citation: https://doi.org/10.5194/amt-2024-98-AC1
RC2:
'Comment on amt-2024-98', Anonymous Referee #2, 30 Oct 2024

The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2024-98/amt-2024-98-RC2-supplement.pdf

Citation: https://doi.org/10.5194/amt-2024-98-RC2
- AC3: 'Reply on RC2', Benjamin Clouser, 15 Apr 2025
  
  The comment was uploaded in the form of a supplement: https://amt.copernicus.org/preprints/amt-2024-98/amt-2024-98-AC3-supplement.pdf
  
  Citation: https://doi.org/10.5194/amt-2024-98-AC3

Peer review completion

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

AR by Benjamin Clouser on behalf of the Authors (07 May 2025) Author's response Author's tracked changes Manuscript

ED: Referee Nomination & Report Request started (19 May 2025) by Federico Fierli

RR by Anonymous Referee #3 (22 May 2025)

RR by Anonymous Referee #2 (11 Jun 2025)

ED: Publish subject to minor revisions (review by editor) (26 Jun 2025) by Federico Fierli

AR by Benjamin Clouser on behalf of the Authors (17 Jul 2025) Author's response Author's tracked changes Manuscript

ED: Publish as is (02 Sep 2025) by Federico Fierli

AR by Benjamin Clouser on behalf of the Authors (15 Sep 2025) Manuscript

Executive editor

The paper describes a new and complex instrument, gathering data on isotopic HDO/H2O ratios in the UTLS region from unique observational campaigns. The excellent accuracy of the measurements from the Airborne Chicago Water Isotope Spectrometer (ChiWIS) has the potential to enhance our understanding of the water vapour cycle, which is challenging to observe with the required accuracy.

The airborne chicago water isotope spectrometer: an integrated cavity output spectrometer for measurements of the HDO ∕ H₂O isotopic ratio in the Asian Summer Monsoon

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Interactive discussion

Peer review completion

Suggestions for revision or reasons for rejection

Suggestions for revision or reasons for rejection

The airborne chicago water isotope spectrometer: an integrated cavity output spectrometer for measurements of the HDO ∕ H2O isotopic ratio in the Asian Summer Monsoon

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Interactive discussion

Peer review completion

Suggestions for revision or reasons for rejection

Suggestions for revision or reasons for rejection

The airborne chicago water isotope spectrometer: an integrated cavity output spectrometer for measurements of the HDO ∕ H₂O isotopic ratio in the Asian Summer Monsoon