P4.6
Impact of new high resolution measurements of near-infrared bands of water vapor on estimates of atmospheric absorption of solar radiation
PAPER WITHDRAWN
Igor V. Ptashnik, University of Reading, Reading, Berkshire, United Kingdom; and K. M. Smith, D. A. Newnham, and K. P. Shine
Recent work has re-evaluated the quality of spectral line databases of water vapour at wavelengths shorter than 1 micron, and indicated that a re-evaluation of longer wavelength bands are needed. New temperature and pressure dependent measurements of the spectra of water vapour absorption spectra, for both the pure and air-broadened cases, have now been completed at the NERC Molecular Spectroscopy Facility at the Rutherford Appleton Laboratory, for wavelengths greater than 1 micron. The measured absorbances are compared with line-by-line generated absorbances, calculated using spectroscopic data from HITRAN 2000 spectral lines in a forward model, for the 2900-4300 cm-1, 5000-5700 cm-1, 6600-7600 cm-1 and 8000-9200 cm-1 regions. The differences between the absorbances are used to generate "correction factors" for the line intensities in HITRAN-2000 line strengths. This talk will present the impact of using these correction factors on estimates of the global clear-sky solar absorption by water vapour using a detailed line-by-line radiation model coupled to a discrete-ordinate scattering code. The possible role of water dimers and 'continua' in accounting for the differences will also be discussed.
Poster Session 4, Radiation in the Clear Sky (Parallel with Poster Session P3)
Friday, 7 June 2002, 1:00 PM-3:00 PM
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