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Volume 14, issue 5
Biogeosciences, 14, 1305–1313, 2017
https://doi.org/10.5194/bg-14-1305-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 14, 1305–1313, 2017
https://doi.org/10.5194/bg-14-1305-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Technical note 15 Mar 2017

Technical note | 15 Mar 2017

Technical note: Coupling infrared gas analysis and cavity ring down spectroscopy for autonomous, high-temporal-resolution measurements of DIC and δ13C–DIC

Mitchell Call et al.

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Baer, D. S., Paul, J. B., Gupta, M., and O'Keefe, A.: Sensitive absorption measurements in the near-infrared region using off-axis integrated-cavity-output spectroscopy, Appl. Phys. B, 75, 261–265, https://doi.org/10.1007/s00340-002-0971-z, 2002.
Balch, W. M., Bates, N. R., Lam, P. J., Twining, B. S., Rosengard, S. Z., Bowler, B. C., Drapeau, D. T., Garley, R., Lubelczyk, L. C., Mitchell, C., and Rauschenberg, S.: Factors regulating the Great Calcite Belt in the Southern Ocean and its biogeochemical significance, Global Biogeochem. Cy., 30, 1124–1144, https://doi.org/10.1002/2016GB005414, 2016.
Bandstra, L., Hales, B., and Takahashi, T.: High-frequency measurements of total CO2: Method development and first oceanographic observations, Mar. Chem., 100, 24–38, https://doi.org/10.1016/j.marchem.2005.10.009, 2006.
Bass, A. M., Bird, M. I., Munksgaard, N. C., and Wurster, C. M.: ISO-CADICA: Isotopic – continuous, automated dissolved inorganic carbon analyser, Rapid Commun. Mass Sp., 26, 639–644, https://doi.org/10.1002/rcm.6143, 2012.
Bass, A. M., O' Grady, D., Berkin, C., Leblanc, M., Tweed, S., Nelson, P. N., and Bird, M. I.: High diurnal variation in dissolved inorganic C, δ13C values and surface efflux of CO2 in a seasonal tropical floodplain, Environ. Chem. Lett., 11, 399–405, https://doi.org/10.1007/s10311-013-0421-7, 2013.
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The conventional method for determining dissolved inorganic carbon (DIC) and it carbon stable isotope ratio (δ13C–DIC) can be a laborious process which can limit sampling frequency. This paper presents a new approach to autonomously determine DIC & δ13C–DIC at high temporal resolution. The simple method requires no customised design. Instead it uses two commercially available instruments and achieved a sampling resolution of 16 mins with precision and accuracy comparable to conventional methods.
The conventional method for determining dissolved inorganic carbon (DIC) and it carbon stable...
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