Articles | Volume 10, issue 11
https://doi.org/10.5194/amt-10-4537-2017
https://doi.org/10.5194/amt-10-4537-2017
Research article
 | 
24 Nov 2017
Research article |  | 24 Nov 2017

A new instrument for stable isotope measurements of 13C and 18O in CO2 – instrument performance and ecological application of the Delta Ray IRIS analyzer

Jelka Braden-Behrens, Yuan Yan, and Alexander Knohl

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Cited articles

Affek, H. and Yakir, D.: The stable isotopic composition of atmospheric CO2, in: Treatise on geochemistry, edited by: Holland, H. and Turekian, K., 5, 2 Edn., 179–212, Elsevier, https://doi.org/10.1016/B978-0-08-095975-7.00407-1, 2014.
Anthoni, P., Knohl, A., Rebmann, C., Freibauer, A., Mund, M., Ziegler, W., Kolle, O., and Schulze, E. D.: Forest and agricultural land-use-dependent CO2 exchange in Thuringia, Germany, Glob. Change Biol., 10, 2005–2019, https://doi.org/10.1111/j.1365-2486.2004.00863.x, 2004.
Baldocchi, D. D.: Measuring and modelling carbon dioxide and water vapour exchange over a temperate broad-leaved forest during the 1995 summer drought, Plant Cell Environ., 20, 1108–1122, https://doi.org/10.1046/j.1365-3040.1997.d01-147.x, 1997.
Baldocchi, D. D. and Bowling, D. R.: Modelling the discrimination of 13CO2 above and within a temperate broad-leaved forest canopy on hourly to seasonal time scales, Plant Cell Environ., 26, 231–244, https://doi.org/10.1046/j.1365-3040.2003.00953.x, 2003.
Baldocchi, D. D. and Wilson, K. B.: Modelling CO2 and water vapor exchange of a temperate broadleaved forest across hourly to decadal time scales, Ecol. Model., 142, 155–184, https://doi.org/10.1016/S0304-3800(01)00287-3, 2001.
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Here we present the instrument characteristics and field applicability of the newly developed Delta Ray analyzer for stable isotope measurements in CO2. We used this analyzer to measure the concentration and the isotopic composition of CO2 exchange in a managed beech forest for 3 months in autumn 2015. During this period an early frost event occurred and our measurements suggest that this short event strongly influenced the measured isotopic composition of CO2 exchange.