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Abstract

The quantitative analysis based on Fourier transform infrared (FTIR) technology is affected by the temperature and pressure properties of gas and the H2O cross section, so the applications of FTIR technology to high-precision measurement area of the greenhouse gases and isotope ratio are restricted. Firstly, the methods of correcting the gas property sensitivities and H2O cross sensitivity are studied, then the standard gas measurements are corrected with these sensitivity correcting functions established through experimental study. The standard deviations of CO, CO2, N2O, CH4 and δ13CO2 are all improved after correcting the sensitivities, and reduced by 1.80-3.38 times. These studies are significant for the applications of FTIR technology to the high-precision measurement area of greenhouse gases and isotope ratio.

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Funds:Project supported by the National Key Scientific Instrument and Equipment Development Projects, China (Grant No. 2013YQ22064302), the National Natural Science Foundation of China (Grant No. 41305020), and the “Twelfth Five-Year” National Science and Technology Project in Rural Arear, China (Grant No. 2012BAJ24B02-5).

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Vol. 64, Issue 2 - 2015-01-20

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