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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 12
Atmos. Meas. Tech., 7, 4445–4453, 2014
https://doi.org/10.5194/amt-7-4445-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Meas. Tech., 7, 4445–4453, 2014
https://doi.org/10.5194/amt-7-4445-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 15 Dec 2014

Research article | 15 Dec 2014

Development and field testing of a rapid and ultra-stable atmospheric carbon dioxide spectrometer

B. Xiang1, D. D. Nelson2, J. B. McManus2, M. S. Zahniser2, R. A. Wehr3, and S. C. Wofsy1 B. Xiang et al.
  • 1School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA
  • 2Aerodyne Research, Inc., 45 Manning Road, Billerica, MA 01821-3976, USA
  • 3Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA

Abstract. We present field test results for a new spectroscopic instrument to measure atmospheric carbon dioxide (CO2) with high precision (0.02 μmol mol−1, or ppm at 1 Hz) and demonstrate high stability (within 0.1 ppm over more than 8 months), without the need for hourly, daily, or even monthly calibration against high-pressure gas cylinders. The technical novelty of this instrument (ABsolute Carbon dioxide, ABC) is the spectral null method using an internal quartz reference cell with known CO2 column density. Compared to a previously described prototype, the field instrument has better stability and benefits from more precise thermal control of the optics and more accurate pressure measurements in the sample cell (at the mTorr level). The instrument has been deployed at a long-term ecological research site (the Harvard Forest, USA), where it has measured for 8 months without on-site calibration and with minimal maintenance, showing drift bounds of less than 0.1 ppm. Field measurements agree well with those of a commercially available cavity ring-down CO2 instrument (Picarro G2301) run with a standard calibration protocol. This field test demonstrates that ABC is capable of performing high-accuracy, unattended, continuous field measurements with minimal use of reference gas cylinders.

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We designed and built a spectrometer, ABsolute Carbon dioxide (ABC), to measure atmospheric concentration of carbon dioxide. This instrument was tested in a forest environment for almost a year. Based on results from this long-term field deployment, we proved that ABC has the capability of performing high-accuracy, unattended, continuous field measurements with minimal use of reference gas cylinders.
We designed and built a spectrometer, ABsolute Carbon dioxide (ABC), to measure atmospheric...
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