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https://doi.org/10.5194/amt-2017-430
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
05 Dec 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
The water vapor self-continuum absorption in the infrared atmospheric windows: New laser measurements near 3.3 μm and 2.0 μm
Loic Lechevallier1,2, Semen Vasilchenko1,3, Roberto Grilli2, Didier Mondelain1, Daniele Romanini1, and Alain Campargue1 1Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France
2Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP*, IGE, F-38000 Grenoble, France¹
3Laboratory of Molecular Spectroscopy, V. E. Zuev Institute of Atmospheric Optics, SB, Russian Academy of Science, 1 Akademician Zuev square, 634021 Tomsk, Russia
Abstract. The amplitude, the temperature dependence and the physical origin of the water vapor absorption continuum are a long standing issue in molecular spectroscopy with direct impact in atmospheric and planetary sciences. In the recent years, we have determined the self-continuum absorption of water vapor at different spectral points of the atmospheric windows at 4.0, 2.1, 1.6 and 1.25 μm, by highly sensitive cavity enhanced laser techniques. These accurate experimental constraints have been used to adjust the last version (V3.2) of the semi-empirical MT_CKD model (Mlawer–Tobin_Clough–Kneizys–Davies) widely incorporated in atmospheric radiative transfer codes. In the present work, the self-continuum cross-sections, CS, are newly determined at 3.3 μm (3007 cm−1) and 2.0 μm (5000 cm−1) by optical-feedback-cavity enhanced absorption spectroscopy (OFCEAS) and cavity ring-down spectroscopy (CRDS), respectively. These new data allow completing the spectral coverage of the 4.0 and 2.1 μm windows, respectively, and testing the recently released V3.2 version of the MT_CKD3 continuum. By complementing high temperature literature data to the present data, the temperature dependence of the self continuum is presented.

1 Institute of Engineering Univ. Grenoble Alpes


Citation: Lechevallier, L., Vasilchenko, S., Grilli, R., Mondelain, D., Romanini, D., and Campargue, A.: The water vapor self-continuum absorption in the infrared atmospheric windows: New laser measurements near 3.3 μm and 2.0 μm, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-430, in review, 2017.
Loic Lechevallier et al.
Loic Lechevallier et al.
Loic Lechevallier et al.

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Short summary
The amplitude, the temperature dependence and the physical origin of the water vapour absorption continuum are a long standing issue in molecular spectroscopy with direct impact in atmospheric and planetary sciences. Using high sensitive laser spectrometers, the water self continuum has been determined with unprecedented sensitivity in infrared atmospheric transparency windows.
The amplitude, the temperature dependence and the physical origin of the water vapour absorption...
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