Determination of molecular dissociation rates from measurements of scattered solar ultraviolet light

Details Determination of molecular dissociation rates from measurements of scattered solar ultraviolet light Determination of molecular dissociation rates from measurements of scattered solar ultraviolet light

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.9011m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. D5, p. 9011-9022.

Computer Science

Sound

Balloon Sounding, Dissociation, Light Scattering, Ozonometry, Solar Radiation, Ultraviolet Radiation, Balloon-Borne Instruments, Ultraviolet Spectroscopy

Scientific paper

Scattered solar ultraviolet light in the spectral region from 250 to 320 nm was measured from a balloon platform at altitudes ranging from 14.5 to 38.8 km with a wavelength resolution of approximately 0.3 nm and an accuracy in determining the wavelength position of 0.5 nm. We used these scatter data to compare and validate a single scattering model developed for this purpose. Using these semiempirical results, we constructed the single scattered component of the ultraviolet irradiance as a function of height and wavelength. From these data, it is possible to determine the percentage dissociation rate of a variety of species due to scattered ultraviolet radiation. These results are presented as a ratio of intensities. The attenuated direct radiation from the sun can be multiplied by the Rayleigh amplification ratio used by Nicolet et al. (1982) to include the contribution to the irradiance from first-order scattered light. The results are multiplied by a cross section of the species under consideration to obtain the dissociation rates. Ozone overburden and an approximate ozone particle density altitude profile are obtained when validating the single-scatter model.

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