Air-Broadened Half-Widths of the 22- and 183-GHz Water-Vapor Lines

Air-broadened half-widths of the 22- and 183-GHz water-vapor lines and associated uncertainties have been determined using comparisons between ground-based radiometric measurements from Atmospheric Radiation Measurement sites in Oklahoma and Alaska, and MonoRTM, a radiative transfer model. Values of...

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Bibliographic Details
Published in:IEEE transactions on geoscience and remote sensing 2008-11, Vol.46 (11), p.3601-3617
Main Authors: Payne, V.H., Delamere, J.S., Cady-Pereira, K.E., Gamache, R.R., Moncet, J.-L., Mlawer, E.J., Clough, S.A.
Format: Article
Language:English
Subjects:
Accuracy
Applied geophysics
Atmosphere
Atmospheric measurements
Atmospheric modeling
Atmospheric radiation
Earth sciences
Earth, ocean, space
Exact sciences and technology
Exponents
Instruments
Internal geophysics
Mathematical models
Meteorology
Microwave radiometry
Radiative transfer
Radiometry
Remote sensing
satellite applications
Satellite broadcasting
Sea measurements
Spectroscopy
Temperature
Uncertainty
water-vapor absorption
water-vapor retrieval
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Summary:Air-broadened half-widths of the 22- and 183-GHz water-vapor lines and associated uncertainties have been determined using comparisons between ground-based radiometric measurements from Atmospheric Radiation Measurement sites in Oklahoma and Alaska, and MonoRTM, a radiative transfer model. Values of the widths obtained using the measurements are 0.0900 cm -1 /atm with 1.6% uncertainty for the 22-GHz line and 0.0992 cm -1 /atm with 2.4% uncertainty for the 183-GHz line. Also presented are spectroscopic parameters for these lines from new calculations performed using the complex implementation of the Robert-Bonamy theory (CRB). The CRB values of the air-broadened widths are 0.0913 cm -1 /atm with 3% uncertainty and a temperature exponent of 0.755 for the 22-GHz line and 0.0997 cm -1 /atm with 3% uncertainty and a temperature exponent of 0.769 for the 183-GHz line. The values for the air-broadened half-widths derived from the measurement/model comparisons show good agreement with the new CRB calculations. For future versions of MonoRTM, width values of 0.0900 and 0.0997 cm -1 /atm are to be adopted with temperature dependences of 0.76 and 0.77 for the 22- and 183-GHz lines, respectively.
ISSN:0196-2892
1558-0644
DOI:10.1109/TGRS.2008.2002435