Water vapour line intensities and self-broadening coefficients in the 5000–5600cm−1 spectral region

Abstract. Radiances observed from IASI are compared to calculated ones. Calculated radiances are obtained using several radiative transfer models (OSS, LBLRTM v11.3 and v11.6) on best estimates of the atmospheric state vectors. The atmospheric state vectors are derived from cryogenic frost point hygrometer and humidity dry bias corrected RS92 measurements flown on sondes launched 1 h and 5 min before IASI overpass time. The temperature and humidity best estimate profiles are obtained by interpolating or extrapolating these measurements to IASI overpass time. The IASI observed and calculated radiances match to within one sigma IASI instrument noise in the spectral region where water vapour is a strong absorber (wavenumber, ν, in the range of 1500 ≤ ν ≤ 1570 and 1615 ≤ ν ≤ 1800 cm−1).

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Line intensities in the 1.5-μm spectral region of acetylene

Journal of Quantitative Spectroscopy and Radiative Transfer ◽

10.1016/j.jqsrt.2007.04.008 ◽

2007 ◽

Vol 108 (3) ◽

pp. 342-362 ◽

Cited By ~ 12

Author(s):

H. Tran ◽

J.-Y. Mandin ◽

V. Dana ◽

L. Régalia-Jarlot ◽

X. Thomas ◽

...

Keyword(s):

Spectral Region ◽

Line Intensities

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Effects of improvements in near-infrared water vapour line intensities on short-wave atmospheric absorption

Geophysical Research Letters ◽

10.1029/2000gl012412 ◽

2001 ◽

Vol 28 (12) ◽

pp. 2401-2404

Author(s):

Júlio C. S. Chagas ◽

David A. Newnham ◽

Kevin M. Smith ◽

Keith P. Shine

Keyword(s):

Water Vapour ◽

Near Infrared ◽

Short Wave ◽

Atmospheric Absorption ◽

Line Intensities

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On the relative absorption strengths of water vapour in the blue wavelength range

Atmospheric Measurement Techniques Discussions ◽

10.5194/amtd-8-5895-2015 ◽

2015 ◽

Vol 8 (6) ◽

pp. 5895-5936 ◽

Cited By ~ 2

Author(s):

J. Lampel ◽

D. Pöhler ◽

J. Tschritter ◽

U. Frieß ◽

U. Platt

Keyword(s):

Water Vapour ◽

Cross Sections ◽

Spectral Region ◽

Field Measurements ◽

Optical Absorption Spectroscopy ◽

Absorption Cross ◽

Absorption Bands ◽

Blue Wavelength ◽

Water Vapour Absorption ◽

Density Ratios

Abstract. In recent updates of the HITRAN water vapour H2O spectroscopic compilation covering the blue spectral region (here: 394–480 nm) significant changes for the absorption bands at 416 and 426 nm were reported. In order to investigate the consistency of the different cross-sections calculated from these compilations, H2O vapour column density ratios for different spectral intervals were retrieved from Long-path and Multi-Axis – Differential Optical Absorption Spectroscopy (DOAS) measurements. We observed a significant improvement of the DOAS evaluation when using the updated HITRAN water vapour absorption cross-sections for the calculation of the reference spectra. In particular the magnitudes of the residual spectra as well as the fit errors were reduced. However we also found that the best match between measurement and model is reached when the absorption cross-section of groups of lines are scaled by factors ranging from 0.5 and 1.9, suggesting that the HITRAN water vapour absorption compilation still needs significant corrections. For this spectral region we present correction factors for HITRAN 2009, HITRAN 2012, HITEMP and BT2 derived from field measurements. Additionally, upper limits for water vapour absorption in the UV-A range from 330–390 nm are given.

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