Measurement of the photodissociation coefficient of NO2 in the atmosphere: I. Method and surface measurements |
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| Authors: | S Madronich D R Hastie B A Ridley H I Schiff |
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| Institution: | 1. Department of Chemistry, York University, M3J 1P3, Downsview, Ontario, Canada
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| Abstract: | An instrument, specifically designed for measurements from a balloon platform in the stratosphere, has been used to obtain ground-level values of the atmospheric photodissociation coefficient of nitrogen dioxide, J NO 2.A typical clear-sky value is 8.0×10-3 s-1 when the solar zenith angle is 40°. Measurements were made as a function of solar zenith angle and correlated with a calibrated Eppley UV radiometer. It is shown that J NO 2may be expressed as a simple function of the radiometer output so that estimates of J NO 2can be made using just an upward looking radiometer to an accuracy of about 20%. The measurements are also found to be in good agreement with calculations of J NO 2using a simplified isotropic multiple scattering computer routine. |
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