Tropospheric odd nitrogen and the atmospheric water vapor cycle

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Atmospheric Moisture, Photochemical Reactions, Troposphere, Water Vapor, Atmospheric Density, Atmospheric Models, Nitrogen, Vertical Distribution

Scientific paper

A model for tropospheric odd nitrogen is presented. It is argued that the vertical profile of HNO3, a highly soluble gas, is similar to the vertical profile of water vapor, so that the volume mixing ratio of gaseous HNO3 to water vapor is constant with altitude. The value of this mixing ratio, deduced from the observed concentration of nitrates in rainwater, is found to be about 4 by 10 to the -7th power. Because the photochemical interconversion times of the other odd nitrogen species are relatively short, the densities of NO, NO2, NO3, N2O5, and HNO2 are obtained from the HNO3 profile assuming local photochemical equilibrium. Sample calculations show reasonable agreement with observed tropospheric NO and NO2 concentrations as well as with the observed rainout rate of nitrates.

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