Line parameters including temperature dependences of air- and self-broadened line shapes of 12C16O2: 2.06-μm region

摘要: Abstract This study reports the results from analyzing a number of high resolution, signal-to-noise ratio (S/N) spectra in 2.06-μm spectral region for pure CO2 and mixtures dry air. A multispectrum nonlinear least squares curve fitting technique has been used to retrieve various line parameters. The dataset includes 27 spectra: ten CO2, two 99% 13C-enriched fifteen 12C-enriched were recorded at gas sample temperatures between 170 297 K. absorption path lengths range 0.347 49 m. pressures varied 1.1 594 Torr; 13CO2 ∼10 146 Torr. For air-broadened spectra, 200 711 Torr with volume mixing ratios ranging 0.014% 0.203%. was applied fit simultaneously all these consistent set positions, intensities, shape parameters including their temperature dependences; this, Voigt modified include (via relaxation matrix formalism) quadratic speed dependence. new are compared select published values, recent ab initio calculations. These required column averaged air mole fraction (XCO2) space-based observations, such as Orbiting Carbon Observatory-2 (OCO-2) satellite mission that NASA launched July 2014.