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

Autor: Herman DI; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America.; Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America., Mead G; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America., Giorgetta FR; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America.; Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America., Baumann E; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America.; Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America., Malarich NA; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America., Washburn BR; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America.; Department of Physics, University of Colorado Boulder, Boulder, Colorado 80309, United States of America., Newbury NR; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America., Coddington I; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America., Cossel KC; Spectrum Technology and Research Division, National Institute of Standards and Technology, Boulder, Colorado 80305, United States of America.
Jazyk: angličtina
Zdroj: Atmospheric measurement techniques [Atmos Meas Tech] 2023; Vol. 16 (17).
DOI: 10.5194/amt-16-4053-2023
Abstrakt: We present an open-path mid-infrared dual-comb spectroscopy (DCS) system capable of precise measurement of the stable water isotopologues H 2 16 O and HD 16 O. This system ran in a remote configuration at a rural test site for 3.75 months with 60% uptime and achieved a precision of < 2‰ on the normalized ratio of H 2 16 O and HD 16 O ( δ D ) in 1000s. Here, we compare the δ D values from the DCS system to those from the National Ecological Observatory Network (NEON) isotopologue point sensor network. Over the multi-month campaign, the mean difference between the DCS δ D values and the NEON δ D values from a similar ecosystem is < 2‰ with a standard deviation of 18‰, which demonstrates the inherent accuracy of DCS measurements over a variety of atmospheric conditions. We observe time-varying diurnal profiles and seasonal trends that are mostly correlated between the sites on daily timescales. This observation motivates the development of denser ecological monitoring networks aimed at understanding regional- and synoptic-scale water transport. Precise and accurate open-path measurements using DCS provide new capabilities for such networks.
Competing Interests: Competing interests. The contact author has declared that none of the authors has any competing interests.
Databáze: MEDLINE
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