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

ABSTRACT: We present an open-path mid-infrared dual-comb spectroscopy (DCS) system capable of precise measurement of the stable water isotopologues H₂¹⁶O and HD¹⁶O. 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 H₂¹⁶O and HD¹⁶O (δD) in 1000s. Here, we compare the δD 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 δD values and the NEON δD values from a similar ecosystem is < 2‰ with a standard deviation of 18‰, which demonstrates the inherent accuracy of DCS measurements over a variety

SUBMITTER: Herman DI 

PROVIDER: S-EPMC10642444 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature