Articles | Volume 14, issue 5
https://doi.org/10.5194/bg-14-1305-2017
https://doi.org/10.5194/bg-14-1305-2017
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, Kai G. Schulz, Matheus C. Carvalho, Isaac R. Santos, and Damien T. Maher

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Cited articles

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.
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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.
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