A complete study of the line intensities of four bands of CO2 around 1.6 and 2.0 μm: A comparison between Fourier transform and diode laser measurements |
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| Authors: | L Régalia-Jarlot B Parvitte X Thomas G Durry |
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| Institution: | a Groupe de Spectrométrie Moléculaire et Atmosphérique, UMR CNRS 6089, UFR Sciences Exactes et Naturelles, Moulin de la Housse, BP 1039, 51687 Reims, Cedex 2, France
b Institut Pierre Simon Laplace (IPSL), Service d’Aéronomie, UMR 7620, CNRS-Réduit de Verrières, B.P. 3, 91371 Verrières-le-Buisson Cedex, France |
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| Abstract: | Atmospheric carbon dioxide is a key specie for the Earth climate. Two spectral windows at 1.6 μm and 2.0 μm are of particular interest for the in situ and remote monitoring of carbon dioxide from satellite, balloon or airborne platforms using infrared absorption spectroscopy. A precise knowledge of the line strengths is a prerequisite for an accurate concentration retrieval. In this paper, we have revisited in the laboratory the (3001)III←(0000) and (3001)II ← (0000) bands of CO2 near 1.6 μm and the (2001)III ← (0000) and (2001)II ← (0000) bands near 2.0 μm by implementing both a high-resolution Connes-type Fourier-transform spectrometer and a tunable diode laser spectrometer equipped with several telecommunication-type semiconductor laser devices. Approximately 200 (respectively 18) transitions of CO2 have been carefully investigated in spectra recorded with the FT spectrometer (respectively with the tunable diode laser spectrometer). The intensity measurements achieved with both instruments are thoroughly compared to previous instrumental determinations, ab-initio calculations and available atmospheric molecular database. |
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| Keywords: | Fourier transform spectrometry Diode laser spectrometry Carbon dioxide |
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