Isotopes in Environmental and Health Studies Continuous field measurements of δC-CO2 and trace gases by FTIR spectroscopy
نویسندگان
چکیده
Continuous analysis of the 13C/12C ratio of atmospheric CO2 (δC-CO2) is a powerful tool to quantify CO2 flux strengths of the two major ecosystem processes assimilation and respiration. Traditional laboratory techniques such as isotope ratio mass spectrometry (IRMS) in combination with flask sampling are subject to technical limitations that do not allow to fully characterize variations of atmospheric δC-CO2 at all relevant timescales. In our study we demonstrate the strength of Fourier transform infrared spectroscopy (FTIR) in combination with a PLS-based calibration strategy for online analysis of δ13CCO2 in ambient air. The ability of the instrument to measure δC-CO2 was tested on a grassland field-site and compared to standard laboratory-based IRMS measurements made on field-collected flask samples. Both methods were in excellent agreement with an average difference of 0.4 ‰ (n = 81). Simultaneously, other important trace gases such as CO, N2O and CH4 were analysed by FTIR spectroscopy.
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