Articles | Volume 16, issue 17
https://doi.org/10.5194/amt-16-4053-2023
https://doi.org/10.5194/amt-16-4053-2023
Research article
 | 
08 Sep 2023
Research article |  | 08 Sep 2023

Open-path measurement of stable water isotopologues using mid-infrared dual-comb spectroscopy

Daniel I. Herman, Griffin Mead, Fabrizio R. Giorgetta, Esther Baumann, Nathan A. Malarich, Brian R. Washburn, Nathan R. Newbury, Ian Coddington, and Kevin C. Cossel

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Short summary
Measurements of the isotope ratio of water vapor provide information about the sources and history of water vapor at a given location, which can be used to understand the impacts of climate change on global water use. Here, we demonstrate a new method for measuring isotope ratios over long open-air paths, which can reduce sampling bias and provide more spatial averaging than standard point sensor methods. We show that this new technique has high sensitivity and accuracy.