Physics
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44...19c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 44, Jan. 1982, p. 19-23. Army-supported research.
Physics
4
Atmospheric Attenuation, Atmospheric Moisture, Centimeter Waves, Infrared Absorption, Water Vapor, Drop Size, Monomers, Particle Size Distribution, Spectral Emission
Scientific paper
Measurements of 'excessive' absorption by atmospheric water vapor, i.e. absorption in excess of water monomer absorption and droplet scattering predictions, are analyzed for the infrared and 5-17/cm regions. Both fair weather and fog data are considered. It is found that observations in both spectral regions can be explained by the clustering (hydrogen bonding) of approximately 0.001 of the vapor molecules. The development leads to several tentative conclusions: (1) equilibrium cluster populations (and maximum absorption) are only attained for vapor in contact with liquid water; (2) the clusters are formed by evaporation, are large, and cannot be modeled by Boltzmann statistics; (3) cluster modes can account for unexplained spectral features at 5-17/cm; (4) excessive absorption both in the infrared and 5-17/cm regions probably can be explained by the same cluster species.
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