The Airborne Chicago Water Isotope Spectrometer: An Integrated Cavity Output Spectrometer for Measurements of the HDO/H<sub>2</sub>O Isotopic Ratio in the Asian Summer Monsoon - INSU - Institut national des sciences de l'Univers
Pré-Publication, Document De Travail Année : 2024

The Airborne Chicago Water Isotope Spectrometer: An Integrated Cavity Output Spectrometer for Measurements of the HDO/H2O Isotopic Ratio in the Asian Summer Monsoon

Résumé

We describe a new version of the Chicago Water Isotope Spectrometer (ChiWIS), designed for airborne measurements of vapor-phase water isotopologues in the dry upper troposphere and lower stratosphere (UTLS) aboard research aircraft. This version of the instrument is a tunable diode laser (TDL), off-axis integrated cavity output spectrometer (OA-ICOS). The instrument was designed to measure the HDO/H 2 O ratio in the 2017 Asian Summer Monsoon flight aboard the M-55 Geophysica during the StratoClim campaign, and so far has also flown aboard the WB-57F in the 2021 and 2022 ACCLIP campaigns.

The spectrometer scans absorption lines of both H 2 O and HDO near 2.647 µm wavelength in a single current sweep, and has an effective path length of 7.5 km under optimal conditions. The instrument utilizes a novel non-axially-symmetric optical component which increases the signal-to-noise ratio by a factor of 3. Ultra-polished, 4-inch diameter cavity mirrors suppress scattering losses, maximize mirror reflectivity, and yield optical fringing significantly below typical electrical noise levels. In laboratory conditions, the instrument has demonstrated a 5-second measurement precision of 3.6 ppbv and 82 pptv in H 2 O and HDO, respectively.

Domaines

Climatologie
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Dates et versions

insu-04703011 , version 1 (19-09-2024)

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Identifiants

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Benjamin W Clouser, Laszlo C Sarkozy, Clare E Singer, Carly C Kleinstern, Adrien Desmoulin, et al.. The Airborne Chicago Water Isotope Spectrometer: An Integrated Cavity Output Spectrometer for Measurements of the HDO/H2O Isotopic Ratio in the Asian Summer Monsoon. 2024. ⟨insu-04703011⟩
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