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Open-path measurement of stable water isotopologues using mid-infrared dual-comb spectroscopy
Published
Author(s)
Daniel Herman, Griffin Mead, Fabrizio Giorgetta, Esther Baumann, Nathan Malarich, Brian Washburn, Nathan R. Newbury, Ian Coddington, Kevin Cossel
Abstract
We present an open-path mid-infrared dual-comb spectrometer (DCS) capable of precise measurement of the stable water isotopologues H216O and HD16O. This system runs in a remote configuration at a rural test site with high uptime and achieves a precision of <2‰ on δD in 1000 seconds. We compare the δD from the DCS to measurements from the National Ecological Observatory Network (NEON) isotopologue point sensor network. Using data from a multi-month campaign, we calculate that the mean difference between DCS δD and NEON δD is <2‰ with a standard deviation of 18‰, which demonstrates the inherent accuracy of DCS measurements over a variety of atmospheric conditions. Precise and accurate open-path measurements of stable water isotopologues using DCS will enable wider development of ecological monitoring networks aimed at understanding regional and synoptic scale water transport.
Herman, D.
, Mead, G.
, Giorgetta, F.
, Baumann, E.
, Malarich, N.
, Washburn, B.
, Newbury, N.
, Coddington, I.
and Cossel, K.
(2023),
Open-path measurement of stable water isotopologues using mid-infrared dual-comb spectroscopy, Atmospheric Measurement Techniques, [online], https://doi.org/10.5194/amt-16-4053-2023, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=935587
(Accessed October 6, 2025)