A water isotope (2H, 17O, and 18O) spectrometer based on optical feedback cavity-enhanced absorption for in situ airborne applications |
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| Authors: | ERT Kerstel RQ Iannone M Chenevier S Kassi H-J Jost D Romanini |
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| Institution: | (1) Department of Physics, Center for Isotope Research, University of Groningen, 9747 AG Groningen, The Netherlands;(2) Laboratoire de Spectrométrie Physique, CNRS UMR5588, Université Joseph Fourier Grenoble, Saint Martin d’Hères, France;(3) Bay Area Environmental Research Institute, Sonoma, CA 95476, USA |
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| Abstract: | Measurements of the isotopic composition of water are thought to help explain stratospheric aridity and related issues in atmospheric sciences. Simultaneous in situ measurements of 2H/1H, 17O/16O, and 18O/16O at high spatial resolution are required for this purpose. We present the design and laboratory performance of a device that will be used on high-altitude research aircraft. It is based on optical feedback cavity-enhanced spectroscopy (OF-CEAS), with better sensitivity than traditional multi-pass arrangements. It utilizes a near-infrared laser source, avoiding the need for cryogens. We demonstrate an airborne precision during tropospheric flight conditions of 1 ‰, 3 ‰, and 9 ‰ for δ18O, δ17O, and δ2H, respectively, for 30-s averaged data and a water concentration of about 200 ppm. With recent improvements we expect to remain within a factor of about three of these values under true stratospheric conditions (water mixing ratio ∼10 ppmv). PACS 07.88.+y; 42.55.Px; 42.62.Fi; 92.60.Hd; 92.60.Jq |
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