Observation of the diurnal variation of atmospheric ozone

Mathematics – Logic

Scientific paper

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Absorption Spectroscopy, Atmospheric Chemistry, Diurnal Variations, Mesosphere, Ozonometry, Stratosphere, Air Pollution, Atmospheric Composition, Atmospheric Pressure, Atmospheric Temperature, Broadband, Photochemical Reactions, Rocket-Borne Instruments, Ultraviolet Radiation, Ultraviolet Spectrometers

Scientific paper

Ozone densities in the stratosphere and mesosphere have been derived from broad-band photometer measurements of Hartley band absorption of middle ultraviolet radiation. Seven rockets were launched during October-November 1979 from Wallops Island. Six rockets, each carrying one detector comprising two UV photometers, were launched at different times of the day. A seventh rocket, with three similar detectors each having three UV photometers, was launched at the time of a full moon and provided estimates of the nighttime ozone densities. Results from these rocket flights form a basis for investigating ozone diurnal variations. The number of flights provide greater statistical reliability for the ozone profiles than is generally afforded from in situ measurements with a single rocket. During the night, an enhancement in ozone densities occurred at altitudes above about 50 km. At 70 km, for example, the nighttime ozone was determined to be a factor of 6.4 greater than at sunset. In addition, these experiments suggest that near 40 km the magnitude of the ozone density at noon may be greater by 10-15% than the nighttime concentration.

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