Water vapor continuum absorption in near-IR atmospheric windows

Ptashnik, Igor V.; Petrova, T. M.; Ponomarev, Yu. N.; Solodov, A. A.

doi:10.1134/s1024856015020098

Cited by 29 publications

(41 citation statements)

References 25 publications

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“…As a result, coinciding measurements obtained by Fourier transform spectroscopy (FTS) with long path absorption cells (Paynter et al, 2009;Ptashnik et al, 2011aPtashnik et al, , 2013Ptashnik et al, , 2015 were found in strong disagreement with the MT_CKDV2.5 modelling in the 4.0, 2.1, and 1.6 µm windows. In particular, the reported FTS values are larger by one and two orders of magnitude in the centre of the 2.1 and 1.6 µm windows, respectively.…”

Section: Introductionmentioning

confidence: 91%

“…In addition to the present study at 3007 cm −1 located at the high energy edge of the window, previous OFCEAS studies were performed at 2283 cm −1 and 2491 cm −1 (Richard et al, 2017). Three datasets were obtained by FTS with long-path absorption cells and cover most of the transparency window: (i) CAVIAR consortium dataset obtained with a 512.7 m pathlength at 293 K (Ptashnik et al, 2011a); (ii) two series of FTS determinations from IAO in Tomsk (Ptashnik et al, 2013(Ptashnik et al, , 2015, obtained with a pathlength of 612 m at 289.5 and 287 K, respectively, (iii) the FTS dataset obtained at NIST by Baranov and Lafferty (2011) with a 100 m pathlength between 311 and 363 K. Finally, Burch and Alt (1984) reported continuum measurements in the centre of the window using a grating spectrograph and an optical configuration aiming to minimise the spectra baseline drifts.…”

Section: Comparison To Literaturementioning

confidence: 99%

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The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm

Lechevallier¹,

Vasilchenko²,

Grilli³

et al. 2018

Atmos. Meas. Tech.

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Abstract. 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. In recent years, we have determined the self-continuum absorption of water vapour 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 (3.2) of the semi-empirical MT_CKD model (MlawerTobin_Clough-Kneizys-Davies), which is widely incorporated in atmospheric radiative-transfer codes. In the present work, the self-continuum cross-sections, C S , 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 extending the spectral coverage of the 4.0 and 2.1 µm windows, respectively, and testing the recently released 3.2 version of the MT_CKD continuum. By considering high temperature literature data together with our data, the temperature dependence of the selfcontinuum is also obtained.

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Section: Introductionmentioning

confidence: 91%

Section: Comparison To Literaturementioning

confidence: 99%

The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm

Lechevallier¹,

Vasilchenko²,

Grilli³

et al. 2018

Atmos. Meas. Tech.

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“…As illustrated in Fig. 6 The strong disagreement with FTS measurements (Ptashnik et al, 2011a(Ptashnik et al, , 2013(Ptashnik et al, , 2015 has been discussed by Shine et al, 2016 andCampargue et al 2016. The measurement of a very small variation of a FTS spectrum baseline induced by the injection of water vapor in an absorption cell requires very high baseline stability during the entire measurement period.…”

Section: Resultsmentioning

confidence: 98%

“…al., 2013; 2015), obtained with a pathlength of 612 m at 289.5 and 287 K, respectively, (iii) the FTS dataset obtained at NIST by Baranov and Lafferty (2011) with a 100 m pathlength between 311 and 363 K. Finally, Burch and Alt (1984) reported continuum measurements in the center of the window using a grating spectrograph and an optical configuration aiming to minimize the spectra baseline drifts. Campargue et al, 2016;Richard et al, 2017;this work); by FTS from Baranov and Lafferty (2011), light blue circles, from CAVIAR (black squares; Ptashnik et al, 2011a), from Tomsk2013 (orange circles; Ptashnik et al, 2013), from Tomsk2015 (orange circles; Ptashnik et al, 2015) and with a grating spectrograph by Burch and Alt (1984) The evolution of the MT_CKD model in the 4.0 µm over the last ten years is illustrated by the 2.4, 2.8, 3.0 and 3.2 versions plotted in Fig. 3.…”

Section: Comparison To Literaturementioning

confidence: 99%

“…The two last versions of the MT_CKD model (V3.0 and V3.2, black and red solid lines, respectively) are compared to the laser based 10 measurements (red circles), to the FTS results obtained in Tomsk (Ptashnik et al, 2013(Ptashnik et al, , 2015; green and orange circles) or by the CAVIAR consortium (Ptashnik et al, 2011a) (black squares). The 30-50 % error bars on the Tomsk2015 FTS values and the small error bars on our laser based values are not plotted for clarity.…”

Section: Comparison To Literaturementioning

confidence: 99%

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The water vapor self-continuum absorption in the infrared atmospheric windows: New laser measurements near 3.3 μm and 2.0 μm

Lechevallier¹,

Vasilchenko²,

Grilli³

et al. 2017

Preprint

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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) 15 widely incorporated in atmospheric radiative transfer codes. In the present work, the self-continuum cross-sections, C S , 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 20 of the self continuum is presented.

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Accurate laboratory determination of the near‐infrared water vapor self‐continuum: A test of the MT_CKD model

et al. 2016

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The semi‐empirical MT_CKD model of the absorption continuum of water vapor is widely used in atmospheric radiative transfer codes of the atmosphere of Earth and, recently, of exoplanets but lacks of experimental validation in the atmospheric windows. Recent laboratory measurements by Fourier transform Spectroscopy led to self‐continuum cross sections much larger than the MT_CKD values in the near‐infrared transparency windows. We report on accurate measurements by Cavity Ring Down Spectroscopy (CRDS) and Optical Feedback‐Cavity‐Enhanced Absorption Spectroscopy (OF‐CEAS) at selected spectral points of the transparency windows centered around 4.0, 2.1, and 1.25 µm. The temperature dependence of the absorption continuum at 4.38 µm is measured in the 23–39°C range. The self‐continuum water vapor absorption is derived either from the baseline variation of water vapor spectra recorded for a series of pressure values over a small spectral interval or from baseline monitoring at fixed laser frequency during pressure ramps. After subtraction of the local water monomer lines contribution, self‐continuum cross sections, Cs, are determined with an accuracy better than 10% from the pressure squared dependence of the continuum absorption measured up to about 15 Torr. Together with our previous measurements in the 2.1 and 1.6 µm windows, the present results provide a unique set of water vapor cross sections for testing the MT_CKD model in four transparency windows. Although showing some important deviations of the absolute values (up to about a factor 4), our accurate measurements validate the overall frequency dependence of the most recent version (V2.8) of the MT_CKD model.

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Water vapor continuum absorption in near-IR atmospheric windows

Cited by 29 publications

References 25 publications

The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm

The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm

The water vapor self-continuum absorption in the infrared atmospheric windows: New laser measurements near 3.3 μm and 2.0 μm

Accurate laboratory determination of the near‐infrared water vapor self‐continuum: A test of the MT_CKD model

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Water vapor continuum absorption in near-IR atmospheric windows

Cited by 29 publications

References 25 publications

The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm

The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm

The water vapor self-continuum absorption in the infrared atmospheric windows: New laser measurements near 3.3 μm and 2.0 μm

Accurate laboratory determination of the near‐infrared water vapor self‐continuum: A test of the MT_CKD model

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The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm

The water vapour self-continuum absorption in the infrared atmospheric windows: new laser measurements near 3.3 and 2.0 µm