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- Title
A water isotope (<sup>2</sup>H, <sup>17</sup>O, and <sup>18</sup>O) spectrometer based on optical feedback cavity-enhanced absorption for in situ airborne applications.
- Authors
Kerstel, E. R. T.; Iannone, R. Q.; Chenevier, M.; Kassi, S.; Jost, H.-J.; Romanini, D.
- 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).
- Subjects
ATMOSPHERIC chemistry; COMPOSITION of water; ISOTOPES; LASERS in isotope separation; SPECTRUM analysis; LOW temperature engineering
- Publication
Applied Physics B: Lasers & Optics, 2006, Vol 11, Issue 2/3, p397
- ISSN
0946-2171
- Publication type
Article
- DOI
10.1007/s00340-006-2356-1