Effects of variation in background mixing ratios of N2, O2, and Ar on the measurement of δ18O–H2O and δ2H–H2O values by cavity ring-down spectroscopy

Johnson, Jennifer E.; Rella, Chris W.

doi:https://doi.org/10.5194/amt-10-3073-2017

Articles | Volume 10, issue 8

https://doi.org/10.5194/amt-10-3073-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/amt-10-3073-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 10, issue 8

Research article

|

24 Aug 2017

Research article |

| 24 Aug 2017

Effects of variation in background mixing ratios of N₂, O₂, and Ar on the measurement of δ¹⁸O–H₂O and δ²H–H₂O values by cavity ring-down spectroscopy

Jennifer E. Johnson and Chris W. Rella

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Final revised paper (published on 24 Aug 2017)
Preprint (discussion started on 24 Apr 2017)

Interactive discussion

Status: closed

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

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- Supplement

RC1: 'Review of “Effects of variation in background mixing ratios of N2, O2, and Ar on the measurement of δ18O-H2O and δ2H-H2O values by cavity ring-down spectroscopy” by Johnson and Rella 2017', Franziska Aemisegger, 19 May 2017
- AC1: 'Response to Franziska Aemisegger's review', Jennifer Johnson, 18 Jun 2017
RC2: 'Review of Johnson and Rella: "Effects of variation in the background mixing ratios..."', Anonymous Referee #2, 30 Jun 2017
- AC2: 'Response to Anonymous Referee #2's review', Jennifer Johnson, 30 Jun 2017

Peer-review completion

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

AR by Jennifer Johnson on behalf of the Authors (30 Jun 2017) Author's response Manuscript

ED: Publish as is (13 Jul 2017) by William Ward

AR by Jennifer Johnson on behalf of the Authors (13 Jul 2017)

Short summary

Cavity ring-down spectrometers (CRDS) can make accurate measurements of trace gases when the inert gas background is constant but are prone to errors when the background is variable. Here, we report that in one CRDS analyzer (L2120-i, Picarro), these errors result from broadening, narrowing, and shifting of the target absorption lines as well as neighboring lines. New spectral acquisition and analysis strategies are needed to make CRDS measurements robust to variable backgrounds.