Mass spectrometric multiple soil-gas flux measurement system with a portable high-resolution mass spectrometer (MULTUM) coupled to an automatic chamber for continuous field observations

Nakayama, Noriko; Toma, Yo; Iwai, Yusuke; Furutani, Hiroshi; Hondo, Toshinobu; Hatano, Ryusuke; Toyoda, Michisato

doi:https://doi.org/10.5194/amt-13-6657-2020

Articles | Volume 13, issue 12

https://doi.org/10.5194/amt-13-6657-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-13-6657-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 13, issue 12

Research article

|

09 Dec 2020

Research article |

| 09 Dec 2020

Mass spectrometric multiple soil-gas flux measurement system with a portable high-resolution mass spectrometer (MULTUM) coupled to an automatic chamber for continuous field observations

Noriko Nakayama, Yo Toma, Yusuke Iwai, Hiroshi Furutani, Toshinobu Hondo, Ryusuke Hatano, and Michisato Toyoda

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Final revised paper (published on 09 Dec 2020)
Preprint (discussion started on 17 Mar 2020)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'amt-2019-389', Anonymous Referee #1, 08 Apr 2020
- AC1: 'Response to Referee1', Noriko Nakayama, 15 May 2020
- AC2: 'Response to Referee2', Noriko Nakayama, 15 Jun 2020
RC2: 'Review', Anonymous Referee #2, 19 May 2020
- AC2: 'Response to Referee2', Noriko Nakayama, 15 Jun 2020
- AC1: 'Response to Referee1', Noriko Nakayama, 15 May 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Noriko Nakayama on behalf of the Authors (14 Jul 2020) Manuscript

ED: Referee Nomination & Report Request started (19 Aug 2020) by Christian Brümmer

RR by Anonymous Referee #2 (08 Oct 2020)

Suggestions for revision or reasons for rejection

Introduction
L37: “Behaviors related to …” sounds odd and is too vague. In addition, atmospheric gases and GHG are produced and consumed in the soil by plant roots or microorganisms. I suggest: “Atmospheric gases and GHG are produced or consumed in the soil by belowground plant biomass or soil microorganisms with production and consumption rates being affected by environmental …..”
L42: “soil gases are expected to vary” not sure how a gas can vary. Maybe “… and therefore, production and consumption rates and, thus, their concentration is expected to vary on a similar time scale”
L52: , and there? does not seem …
L101: “detectioFcampan” is a typo I guess

Materials and Methods
L147: I suggest adding “Though determination of Oxygen concentration would be more accurate using O2+ detection, Oxygen was detected … ”. Then the audience more easily understands that you sacrificed Oxygen precision for the benefit of CH4 and N2O precision and that the system can be optimized with regard to oxygen precision.
L183: Please also add units for C and t.
Equation 3 brackets are arbitrary.
L205: The MDF / MQF section is still confusing, and I still don’t get why so many simulations are required to calculate MQF. The standard error of the regression slope is the square root of the ratio between error variance and the sum of squares for the independent variable (in this case time). Using the square root of your instrument precision as error variance should result in a very similar value.

Results
L262: Aa,i was defined earlier as measurement accuracy. I guess you also mean measurement accuracy with frequency here. Please correct.
L320: 2 should be in superscript

Figure 11 caption: MQF instead of QMF

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ED: Publish subject to technical corrections (10 Oct 2020) by Christian Brümmer

AR by Noriko Nakayama on behalf of the Authors (17 Oct 2020) Author's response Manuscript

Short summary

We developed a field-deployable multiple soil-gas flux measurement system using a portable high-resolution mass spectrometer (MULTUM) combined with an automated flux chamber. The current system is capable of simultaneous quantification of O₂, N₂O, CH₄, and CO₂ concentrations every 2.5 min within a single sample, yielding hourly flux data. We applied the system to 5 d continuous soil–atmosphere field flux observations and interesting responses in N₂O and CO₂ upon rainfall events were observed.