Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance
High-precision analysis of the <sup>17</sup>O / <sup>16</sup>O isotope ratio in water and water vapor is of interest in hydrological, paleoclimate, and atmospheric science applications. Of specific interest is the parameter <sup>17</sup>O excess (&Del...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-08-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/7/2421/2014/amt-7-2421-2014.pdf |
| _version_ | 1818844678436421632 |
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| author | E. J. Steig V. Gkinis A. J. Schauer S. W. Schoenemann K. Samek J. Hoffnagle K. J. Dennis S. M. Tan |
| author_facet | E. J. Steig V. Gkinis A. J. Schauer S. W. Schoenemann K. Samek J. Hoffnagle K. J. Dennis S. M. Tan |
| author_sort | E. J. Steig |
| collection | DOAJ |
| description | High-precision analysis of the <sup>17</sup>O / <sup>16</sup>O
isotope ratio in water and water vapor is of interest in
hydrological, paleoclimate, and atmospheric science applications.
Of specific interest is the parameter
<sup>17</sup>O excess (Δ<sup>17</sup>O),
a measure of the deviation from a~linear relationship between
<sup>17</sup>O / <sup>16</sup>O and
<sup>18</sup>O / <sup>16</sup>O ratios. Conventional analyses of
Δ<sup>17</sup>O of water are obtained by fluorination of
H<sub>2</sub>O to O<sub>2</sub> that is analyzed by dual-inlet isotope
ratio mass spectrometry (IRMS). We describe a new laser spectroscopy
instrument for high-precision Δ<sup>17</sup>O
measurements. The new instrument uses cavity ring-down spectroscopy
(CRDS) with laser-current-tuned cavity resonance to achieve reduced measurement
drift compared with previous-generation instruments. Liquid water
and water-vapor samples can be analyzed with a better than 8 per meg
precision for Δ<sup>17</sup>O using integration times of
less than 30 min. Calibration with respect to accepted water
standards demonstrates that both the precision and the accuracy of Δ<sup>17</sup>O
are competitive with conventional IRMS methods. The new instrument also
achieves simultaneous analysis of δ<sup>18</sup>O,
Δ<sup>17</sup>O and δ<i>D</i> with precision of < 0.03‰,
< 0.02 and < 0.2‰, respectively, based on repeated
calibrated measurements. |
| first_indexed | 2024-12-19T05:17:35Z |
| format | Article |
| id | doaj.art-f6b657207a57497a8e89afc10430fd0a |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-19T05:17:35Z |
| publishDate | 2014-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-f6b657207a57497a8e89afc10430fd0a2022-12-21T20:34:37ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482014-08-01782421243510.5194/amt-7-2421-2014Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonanceE. J. Steig0V. Gkinis1A. J. Schauer2S. W. Schoenemann3K. Samek4J. Hoffnagle5K. J. Dennis6S. M. Tan7Δ*IsoLab, Earth & Space Sciences, and Quaternary Research Center, University of Washington, Seattle, WA 98195, USACentre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, DenmarkΔ*IsoLab, Earth & Space Sciences, and Quaternary Research Center, University of Washington, Seattle, WA 98195, USAΔ*IsoLab, Earth & Space Sciences, and Quaternary Research Center, University of Washington, Seattle, WA 98195, USAΔ*IsoLab, Earth & Space Sciences, and Quaternary Research Center, University of Washington, Seattle, WA 98195, USAPicarro Inc. Santa Clara, CA 95054, USAPicarro Inc. Santa Clara, CA 95054, USAPicarro Inc. Santa Clara, CA 95054, USAHigh-precision analysis of the <sup>17</sup>O / <sup>16</sup>O isotope ratio in water and water vapor is of interest in hydrological, paleoclimate, and atmospheric science applications. Of specific interest is the parameter <sup>17</sup>O excess (Δ<sup>17</sup>O), a measure of the deviation from a~linear relationship between <sup>17</sup>O / <sup>16</sup>O and <sup>18</sup>O / <sup>16</sup>O ratios. Conventional analyses of Δ<sup>17</sup>O of water are obtained by fluorination of H<sub>2</sub>O to O<sub>2</sub> that is analyzed by dual-inlet isotope ratio mass spectrometry (IRMS). We describe a new laser spectroscopy instrument for high-precision Δ<sup>17</sup>O measurements. The new instrument uses cavity ring-down spectroscopy (CRDS) with laser-current-tuned cavity resonance to achieve reduced measurement drift compared with previous-generation instruments. Liquid water and water-vapor samples can be analyzed with a better than 8 per meg precision for Δ<sup>17</sup>O using integration times of less than 30 min. Calibration with respect to accepted water standards demonstrates that both the precision and the accuracy of Δ<sup>17</sup>O are competitive with conventional IRMS methods. The new instrument also achieves simultaneous analysis of δ<sup>18</sup>O, Δ<sup>17</sup>O and δ<i>D</i> with precision of < 0.03‰, < 0.02 and < 0.2‰, respectively, based on repeated calibrated measurements.http://www.atmos-meas-tech.net/7/2421/2014/amt-7-2421-2014.pdf |
| spellingShingle | E. J. Steig V. Gkinis A. J. Schauer S. W. Schoenemann K. Samek J. Hoffnagle K. J. Dennis S. M. Tan Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance Atmospheric Measurement Techniques |
| title | Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance |
| title_full | Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance |
| title_fullStr | Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance |
| title_full_unstemmed | Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance |
| title_short | Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance |
| title_sort | calibrated high precision sup 17 sup o excess measurements using cavity ring down spectroscopy with laser current tuned cavity resonance |
| url | http://www.atmos-meas-tech.net/7/2421/2014/amt-7-2421-2014.pdf |
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