Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 18, issue 21
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:
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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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.
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Short summary
The water molecule comes in several different varieties, which are nearly indistinguishable in daily life. However, slight differences between the water molecule types can be exploited to achieve better scientific understanding of parts of Earth's atmosphere. In this work we describe the design, construction, and operation of an instrument meant to measure these molecules aboard research aircraft up to altitudes of 20 km.
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