Development of a calibration system for stable water vapor isotope measurements using Cavity Ring-Down Spectroscope

Daeun Lee; Yeongcheol Han; Songyi Kim; Soon Do Hur; Jeonghoon Lee

doi:10.14770/jgsk.2020.56.3.395

Development of a calibration system for stable water vapor isotope measurements using Cavity Ring-Down Spectroscope

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Type: Academic journal

Author: Daeun Lee (이화여자대학교) Yeongcheol Han (한국해양과학기술원) Songyi Kim (이화여자대학교) Soon Do Hur (한국해양과학기술원) Jeonghoon Lee (이화여자대학교)

Journal: The Geological Society of Korea Journal of the Geological Society of Korea Vol.56 No.3 KCI Accredited Journals SCOPUS

Published: 2020.6

Pages: 395 - 403 (9page)

DOI: 10.14770/jgsk.2020.56.3.395

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Development of a calibration system for stable water vapor isotope measurements using Cavity Ring-Down Spectroscope

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Recent development of laser-based spectroscopy introduces continuous measurement method for water vapor isotopic compositions. The measurement precision and accuracy should precede to obtain high temporal resolution data. Here, we developed a calibration system for water vapor isotopic measurement for applications to field studies. Each standard water vapor, evaporated from two isotopically distinct standard waters, was constantly introduced to the Cavity Ring-Down Spectroscope (CRDS). The theoretical isotopic compositions of standard water vapor, calculated using an equilibrium fractionation accompanied by constant temperature, were used as references to calculate a measurement error. This study was conducted in various environment, such as on-board measurements and in Antarctica, to validate the stability of the system when the humidity was lower than the analyzer recommendations. The cavity humidity was calibrated using local Automatic Weather Station (AWS), and then the calibration equation was determined in each different humidity level using enriched (δ18O: -7.98‰, δD: -56.1‰) and depleted (δ18O: -37.44‰, δD: -294.8‰) standards. The calibration system successfully reproduced normalized errors(Δ) within reported values, less than 0.1±0.21‰ (1±1.4‰) for δ18O (δD), without humidity dependency. As a result, the method is widely applicable for long-term high resolution observations at extremely dry environment like polar regions and high altitude regions.

#수증기 안정 동위원소 #공동 광자 감쇠 분광기 #검정법 #stable water vapor isotopes #Cavity Ring-Down Spectroscope #calibration

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Bailey, A. / 2015 / The stability and calibration of water vapor isotopic ration measurements during long-term deployments / Atmospheric Measurement Techniques 8:4521~4538

Bailey, A. / 2013 / Characterizing moisture ex- change between the Hawaiian convective boundary layer and free troposphere using stable isotopes in water / Journal of Geophysical Research 118:8208~8221

Benetti, M. / 2017 / Stable isotopes in the atmospheric marine boundary layer water vapour over the Atlantic Ocean, 2012-2015 / Scientific Data 4:160128

Bonne, J. -L. / 2019 / Resolving the controls of water vapour isotopes in the Atlantic sector / Nature Communications 10:1632

Bonne, J. -L. / 2014 / The isotopic composition of water vapour and precipitation in Ivittuut, southern Greenland / Atmospheric Chemistry and Physics 14:4419~4439

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UCI(KEPA) : I410-ECN-0101-2020-450-000667952

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