Mesospheric ozone measured from ground-based millimeter wave observations

Physics

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Abundance, Atmospheric Composition, Diurnal Variations, Mesosphere, Microwave Emission, Ozone, Daytime, Density Distribution, Gas Density, Millimeter Waves, Night Sky

Scientific paper

Nighttime-to-daytime variation of the mesospheric ozone abundance was measured by means of the 110.8-GHz O3 rotational line during February 1975 with a ground-based radio telescope located at 31 deg N, 104 deg W. The daytime and nighttime frequency profiles were treated by a numerical inversion method to obtain the altitude distributions of the ozone mixing ratio. The dawn mesospheric O3 decay was observed to occur over a 50-min interval during sunrise. The early daytime reduction of O3 column density is approximately 3.4 by 10 to the 15th power per sq cm above 60 km and is 10 to the 16th power per sq cm above 50 km, both being a reduction by a factor of about 2 over the nighttime column densities.

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