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    On-Site Calibration for High Precision Measurements of Water Vapor Isotope Ratios Using Off-Axis Cavity-Enhanced Absorption Spectroscopy

    Source: Journal of Atmospheric and Oceanic Technology:;2011:;volume( 028 ):;issue: 011::page 1448
    Author:
    Rambo, Joshua
    ,
    Lai, Chun-Ta
    ,
    Farlin, James
    ,
    Schroeder, Matt
    ,
    Bible, Ken
    DOI: 10.1175/JTECH-D-11-00053.1
    Publisher: American Meteorological Society
    Abstract: table isotope ratio measurements of atmospheric water vapor (δ18Ov and δ2Hv) are scarce relative to those in precipitation. This limitation is rapidly changing due to advances in absorption spectroscopy technology and the development of automatically calibrated field-deployable instrument systems. These systems allow high throughput, in situ monitoring of the temporal variability in δ18Ov and δ2Hv. This paper presents a robust calibration procedure for reliable, high-precision δ18Ov and δ2Hv measurements at less than hourly intervals in this study. The method described here was developed and tested using a coupled system consisting of a commercial water vapor isotopic source device and a commercial water vapor isotope analyzer [Los Gatos Research (LGR) model WVIA-24] based on the off-axis integrated cavity output spectroscopy (off-axis ICOS) technique. The isotope analyzer shows a time-dependent response that varies with water vapor mixing ratio, suggesting the need of regular (hourly) calibration achievable by a single reference water source evaluated at a range of mixing ratios. By using a three-point calibration procedure with a range of user-specified water vapor mixing ratios, the authors were able to produce hourly δ18Ov and δ2Hv measurements with an overall accuracy (±0.2? for δ18O, ±0.5? for δ2H) and precision (±0.3? for δ18O, ±3.0? for δ2H) in the laboratory. The calibration procedure reliably produced data that were consistent with those collected by the conventional cryogenic method in an old-growth forest.
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      On-Site Calibration for High Precision Measurements of Water Vapor Isotope Ratios Using Off-Axis Cavity-Enhanced Absorption Spectroscopy

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4227903
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    • Journal of Atmospheric and Oceanic Technology

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    contributor authorRambo, Joshua
    contributor authorLai, Chun-Ta
    contributor authorFarlin, James
    contributor authorSchroeder, Matt
    contributor authorBible, Ken
    date accessioned2017-06-09T17:24:01Z
    date available2017-06-09T17:24:01Z
    date copyright2011/11/01
    date issued2011
    identifier issn0739-0572
    identifier otherams-84554.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4227903
    description abstracttable isotope ratio measurements of atmospheric water vapor (δ18Ov and δ2Hv) are scarce relative to those in precipitation. This limitation is rapidly changing due to advances in absorption spectroscopy technology and the development of automatically calibrated field-deployable instrument systems. These systems allow high throughput, in situ monitoring of the temporal variability in δ18Ov and δ2Hv. This paper presents a robust calibration procedure for reliable, high-precision δ18Ov and δ2Hv measurements at less than hourly intervals in this study. The method described here was developed and tested using a coupled system consisting of a commercial water vapor isotopic source device and a commercial water vapor isotope analyzer [Los Gatos Research (LGR) model WVIA-24] based on the off-axis integrated cavity output spectroscopy (off-axis ICOS) technique. The isotope analyzer shows a time-dependent response that varies with water vapor mixing ratio, suggesting the need of regular (hourly) calibration achievable by a single reference water source evaluated at a range of mixing ratios. By using a three-point calibration procedure with a range of user-specified water vapor mixing ratios, the authors were able to produce hourly δ18Ov and δ2Hv measurements with an overall accuracy (±0.2? for δ18O, ±0.5? for δ2H) and precision (±0.3? for δ18O, ±3.0? for δ2H) in the laboratory. The calibration procedure reliably produced data that were consistent with those collected by the conventional cryogenic method in an old-growth forest.
    publisherAmerican Meteorological Society
    titleOn-Site Calibration for High Precision Measurements of Water Vapor Isotope Ratios Using Off-Axis Cavity-Enhanced Absorption Spectroscopy
    typeJournal Paper
    journal volume28
    journal issue11
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH-D-11-00053.1
    journal fristpage1448
    journal lastpage1457
    treeJournal of Atmospheric and Oceanic Technology:;2011:;volume( 028 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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