Visible and near-infrared O line intensity corrections for HITRAN-96

Giver, L. P.; Chackerian, C.; Varanasi, P.

doi:10.1016/s0022-4073(99)00223-x

Cited by 101 publications

(90 citation statements)

References 11 publications

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“…I meas and I mod are here the intensities of measured and modelled radiation, V is the Voigt line shape function as described by Goody [1995], n is the absorber density and l is the optical path length. The equation is evaluated at the line center position implicitly assuming a correct line width.…”

Section: Resultsmentioning

confidence: 99%

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Evaluation of spectroscopic databases of water vapor between 585 and 600 nm

Veihelmann

Lang

Newnham

et al. 2002

Geophysical Research Letters

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[1] The water vapor absorption band between 585 and 600 nm is suitable for atmospheric water vapor column retrieval from satellite data because saturation effects are absent and water is the only significant structured absorber within this region. Accurate knowledge of the absorption spectroscopy is important for the retrieval as well as for assessing radiative forcing. Spectral databases for this wavelength region lack experimental validation by atmospheric observations. By means of a line-by-line radiative transfer model we simulate the direct solar radiation reaching the ground using different spectral databases. We compare simulated spectra with high resolution measurements made using a ground based Fourier transform spectrometer. Instrument effects are considered and residuals are assigned to line intensity errors as far as possible. A quality estimate of four different databases is provided and the consequences for satellite based instrumentations are discussed.

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Section: Resultsmentioning

confidence: 99%

“…Line shapes are calculated as Voigt profiles [e.g. Goody, 1995] and depend on pressure and temperature [Rothman et al, 1998]. Line shape and intensity values are taken from either HITRAN-96, HITRAN-2000, ESA-WVB or ULB-BISA-UFR.…”

Section: Data and Modelmentioning

confidence: 99%

Evaluation of spectroscopic databases of water vapor between 585 and 600 nm

Veihelmann

Lang

Newnham

et al. 2002

Geophysical Research Letters

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“…Comparison of intensities measured in this work with those given the corrected version of HITRAN [13] in the frequency range 13202-15195 cm ¥ § ¦ . Given is the ratio of I(this work) to I(HITRAN) as a function of the intensity measured here.…”

Section: Figmentioning

confidence: 99%

“…This strategy delivered spectra with a signal-to-noise ratio of order 3500:1 compared with a value around 1250:1 realised in published work [4,5,6,7,8,9,10,11,12], allowing reliable line parameters including line intensities to be extracted for many weak water lines. This issue has taken on particular significance since concerns have been raised about water line intensities in the near infrared and visible [13,14,15,16] used in standard databases such as HITRAN [17]. In this paper we present details of new experimental measurements and detailed analysis of the 13,200 -15,000 cm ¢ region of the spectrum which covers the " !…”

Section: Introductionmentioning

confidence: 99%

Weak Line Water Vapor Spectrum in the 11 787–13 554 cm−1 Region

Tolchenov

Tennyson

Brault

et al. 2002

Journal of Molecular Spectroscopy

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“…Global climate models also depend on sources of spectroscopic information to provide accurate calculations of the atmosphere's energy budget. When Giver et al [2000] revealed that errors had been introduced in the 1996 version of HITRAN while converting original line parameter data into database format, substantial revisions were made to H 2 O line parameters in the Vis/NIR. Other investigations of spectral databases were partly motivated by the search for possible causes for discrepancies between RT models and atmospheric shortwave observations, sometimes referred to as anomalous absorption.…”

Section: Introductionmentioning

confidence: 99%

Field test of spectral line intensity parameters for tropospheric water vapor

et al. 2003

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[1] We report the results of a field experiment designed to study atmospheric water vapor absorption in the visible and near-infrared spectral regions between 550 and 1000 nm. We carried out spectroscopic ground measurements of direct solar radiation under clear-sky conditions in Boulder, Colorado. The data with a spectral resolution of approximately 1 nm were analyzed using the differential optical absorption spectroscopy (DOAS) technique in five different absorption bands of water vapor. We show that this technique can reveal the broadband effects of errors and inconsistencies in absorption spectra information for the water molecule. Retrievals of column tropospheric water vapor from the field spectra were compared to simultaneous independent estimates from Global Positioning System (GPS) data and radiosonde soundings. The data set is used to critically assess the widely used High-Resolution Transmission Molecular Absorption Database (HITRAN) [Rothman et al., 1998]. The results indicate that line intensities in the 3n + d polyad centered at 820 nm are underestimated by 21% with respect to the strong 3n polyad centered at 940 nm, while the 4n polyad at 720 nm shows agreement within the measurement accuracy of 3%. Two weaker bands centered at 650 and 590 nm were found to be overestimated by about 8-10%. The effect of the proposed corrections on the absorption of incoming solar flux for a clear-sky atmosphere is estimated to be 0.6 W/m 2 for an overhead Sun.

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Visible and near-infrared O line intensity corrections for HITRAN-96

Cited by 101 publications

References 11 publications

Evaluation of spectroscopic databases of water vapor between 585 and 600 nm

Evaluation of spectroscopic databases of water vapor between 585 and 600 nm

Weak Line Water Vapor Spectrum in the 11 787–13 554 cm−1 Region

Field test of spectral line intensity parameters for tropospheric water vapor

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