On the photodissociation of water vapour in the mesosphere

Details On the photodissociation of water vapour in the mesosphere On the photodissociation of water vapour in the mesosphere

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..871n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, July 1984, p. 871-880.

Physics

13

Atmospheric Moisture, Mesosphere, Photodissociation, Water Vapor, Absorption Cross Sections, Lyman Alpha Radiation, Reaction Products, Schumann-Runge Bands, Solar Radiation

Scientific paper

Simple formulas are derived for the water-vapor photodissociation frequency for Lyman-alpha and for the O2 Schumann-Runge band for mesospheric conditions. The precision of the two formulas is shown to be good, with an uncertainty of less than 10 percent; however, their accuracy depends on the accuracy of observational and experimental parameters such as the absolute solar irradiances, the variable transmittance of O2 and the H2O effective absorption cross sections. Numerical results indicate that Lyman-alpha plays the leading role in the photodissociation of water vapor in the mesosphere where the total number of O2 molecules is less than 10 to the 21st per sq cm, i.e., above 60 km for an overhead sun, or above 65 km for solar zenith angle of 60 deg.

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