Experimental study of the line mixing coefficient for 118.75GHz oxygen line

Tretyakov, M.Yu.; Golubiatnikov, G. Yu.; Паршин, В.В.; Koshelev, М.А.; Myasnikova, S.E.; Krupnov, A. F.; Rosenkranz, P. W.

doi:10.1016/j.jms.2003.09.008

Cited by 37 publications

(31 citation statements)

References 23 publications

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“…They measured N 2 -broadening of O 2 lines 530 with rotational quantum numbers N from 1 to 19 and self-broadening for N from 1 to 27 (the 1-line had previously been measured in Tretyakov et al (2004)). Uncertainties of the measured line widths were estimated here by considering the results of Tretyakov et al (2005) and Koshelev et al (2016) together.…”

Section: Covariance Between Oxygen-line Broadening Coefficientsmentioning

confidence: 99%

“…The mixing coefficient of the 1-line was measured separately in Tretyakov et al (2004), so it is not correlated with the others.…”

Section: Covariance Between Oxygen Line Mixing Coefficientsmentioning

confidence: 99%

“…The line-width and line-mixing coefficients for the 118 GHz line are taken from Tretyakov et al (2004)., who report results of laboratory investigations of the pressure-dependent parameters of the single 118-GHz line. The submillimetre line-widths are from Golubiatnikov and Krupnov (2003), except the one at 234 GHz line that comes from Drouin (2007).…”

Section: A2 Oxygenmentioning

confidence: 99%

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Uncertainty of atmospheric microwave absorption model: impact on ground-based radiometer simulations and retrievals

Cimini¹,

Rosenkranz²,

Tretyakov³

et al. 2018

Preprint

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Abstract. This paper presents a general approach to quantify the absorption model uncertainty due to uncertainty in underlying spectroscopic parameters. The approach is applied to radiative transfer calculations in the 20-60 GHz range, which is commonly exploited for atmospheric sounding by microwave radiometer (MWR). The approach however is not limited to any frequency range, observing geometry, or particular instrument. In the considered frequency range, relevant uncertainties come from water vapor and oxygen spectroscopic parameters. The uncertainty of the following parameters is 15 found to dominate: (for water vapor) self and foreign continuum absorption coefficients, line broadening by dry air, line intensity, temperature-dependence exponent for foreign continuum absorption, and line shift-to-broadening ratio; (for oxygen) line intensity, line broadening by dry air, line mixing, temperature-dependence exponent for broadening, zerofrequency line broadening in air, temperature-dependence coefficient for line mixing. The full uncertainty covariance matrix is then computed for the set of spectroscopic parameters with significant impact. The impact of the spectroscopic parameter 20 uncertainty covariance matrix on simulated downwelling microwave brightness temperatures (T B ) in the 20-60 GHz range is calculated for six atmospheric climatology conditions. The uncertainty contribution to simulated T B ranges from 0.30 K (sub-Arctic winter) to 0.92 K (tropical) at 22.2 GHz, and from 2.73 K (tropical) to 3.31 K (sub-Arctic winter) at 52.28 GHz.The uncertainty contribution is nearly zero at 55-60 GHz frequencies. Finally, the impact of spectroscopic parameter uncertainty on ground-based MWR retrievals of temperature and humidity profiles is discussed. 25

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Section: Covariance Between Oxygen-line Broadening Coefficientsmentioning

confidence: 99%

“…The mixing coefficient of the 1-line was measured separately in Tretyakov et al (2004), so it is not correlated with the others.…”

Section: Covariance Between Oxygen Line Mixing Coefficientsmentioning

confidence: 99%

Section: A2 Oxygenmentioning

confidence: 99%

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Uncertainty of atmospheric microwave absorption model: impact on ground-based radiometer simulations and retrievals

Cimini¹,

Rosenkranz²,

Tretyakov³

et al. 2018

Preprint

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show abstract

“…However, in usual atmospheric conditions the collisional line broadening is signicantly stronger, in the millimeter wave spectral range, than the Doppler linewidth and for this reason these deviations from the Voigt profile can be ignored. Finally, the line mixing effects (Liebe et al, 1992;Tretyakov et al, 2004) were not accounted for in this database because they are negligible for the frequencies and pressures ranges of interest.…”

Section: Description Of the Master Databasementioning

confidence: 99%

“…For 16 O 2 we used 2 the N 2 -and O 2 -broadening coefficients measured recently (Krupnov et al, 2002;Tretyakov et al, 2004). For O 18 O 16 , the broadening coefficients were estimated from those of rotational transitions involving similar quantum numbers of the 16 O 2 isotopic species (Krupnov et al, 2002;Tretyakov et al, 2004). These values are quoted in Table IV Finally, it has to be mentioned that the earth magnetic field leads to Zeeman effects which may modify the profile of oxygen lines.…”

Section: Molecularmentioning

confidence: 99%

Molecular Line Parameters for the “MASTER” (Millimeter Wave Acquisitions for Stratosphere/Troposphere Exchange Research) Database

et al. 2005

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In order to investigate the upper troposphere/lower stratosphere (UTLS) region of the earth's atmosphere, ESA/ESTEC (European space agency) is considering the opportunity to develop the spaceborne limb sounding millimeter sensor "MASTER" (millimeter wave acquisitions for stratosphere/troposphere exchange research). This instrument is part of the "atmospheric composition explorer for chemistry and climate interactions" (ACECHEM) project. In addition, ESA/ESTEC is developing the "MARSCHALS" (millimeter-wave airborne receiver for spectroscopic characterization of atmospheric limb sounding) airborne instrument which will demonstrate the feasibility of MASTER. The present paper describes the line-by-line database which was generated in order to meet at best the needs of the MASTER (or MARSCHALS) instrument. The linelist involves line positions, line intensities, line broadening and line shift parameters in the 294-305, 316-325, 342-348, 497-506 and 624-626 GHz spectral microwindows. This database was first generated for the target molecules for MASTER (H 2 O, O 3 , N 2 O, CO, O 2 , HNO 3 , HCl, ClO, CH 3 Cl, BrO). In addition, ten additional molecules (SO 2 , NO 2 , OCS, H 2 CO, HOCl, HCN, H 2 O 2 , COF 2 , HO 2 and HOBr) had also to be considered in the database as "possible interfering species" for the retrieval of the target molecules of MASTER. The line parameters were derived, depending on their estimated accuracy, (i) from a combination of spectral parameters included in the JPL and HITRAN catalogs (ii) from data taken into the literature or (iii) using data obtained through experimental measurements (and/or) calculations performed during the present study.

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Obtaining precise constants of atmospheric lines in the millimeter and submillimeter wavelength ranges

Tretyakov

Golubiatnikov

Паршин

et al. 2008

Radiophys Quantum El

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An important physical problem of supplying the Earth's atmosphere satellite monitoring with precise laboratory measurements of the line constants of atmospheric gases has been resolved. We developed a complex of spectrometers and techniques which improves the accuracy of lineconstant measurements by about an order of magnitude. Systematic errors of measurements do not exceed the statistical ones. Agreement of the results obtained by two different spectrometers improves reliability of the measured constants. Examples of measurements of collisional constants (broadening, shift, and collisional coupling) for the most important diagnostic atmospheric lines of water and oxygen molecules are presented. A number of collisional constants of the molecules are obtained for the first time and some errors of the previous researchers are corrected. The measured parameters have been used for the international projects. Prospects for supplying planned satellite terahertz projects with precise laboratory data are pointed out.1. Global monitoring of the Earth's atmosphere, data acquisition for weather forecast, and prediction of climate variations are fulfilled, in the long run, by microwave radiometric measurements from satellites. Measurement of altitude distributions of the atmospheric temperature and humidity is based on observation of spectral lines of atmospheric gases, primarily water and oxygen molecules. The interpretation of complex profiles of atmospheric lines observed from a satellite requires laboratory measurements of collisional-interaction constants of the corresponding molecule transitions, including broadening, shift, and collisional coupling (interference) of spectral lines. The accuracy of knowledge of the mentioned constants determines the accuracy of retrieved information.Until very recent time, the required accuracy of laboratory measurements of these parameters has not been reached, especially in the millimeter and submillimeter wavelength ranges. For the most important diagnostic line of a water molecule at 183 GHz, the spread of values of the broadening constants measured in different laboratories reached 30%, and the shift constant was not measured in a laboratory at all [1]. The errors of determining the line broadening constants of an oxygen molecule reached up to 25% [2,3]. In this case, if the error of assigning the broadening constant exceeds 5%, it becomes the main in the total error of determining the atmospheric parameters [4]. Improvement of the accuracy of laboratory studies of the atmospheric-line constants is a topical problem in experimental physics, which is of great applied value.2. We developed a complex of spectrometers of the millimeter and submillimeter wavelength ranges with measurement and calibration techniques. As a result, the accuracy was increased by more than one order of magnitude amd the reliability of measurement of all mentioned molecule constants, such as broadening, shift, and collisional coupling of spectral lines, was improved.The complex comprises two types of spect...

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Experimental study of the line mixing coefficient for 118.75GHz oxygen line

Cited by 37 publications

References 23 publications

Uncertainty of atmospheric microwave absorption model: impact on ground-based radiometer simulations and retrievals

Uncertainty of atmospheric microwave absorption model: impact on ground-based radiometer simulations and retrievals

Molecular Line Parameters for the “MASTER” (Millimeter Wave Acquisitions for Stratosphere/Troposphere Exchange Research) Database

Obtaining precise constants of atmospheric lines in the millimeter and submillimeter wavelength ranges

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