Evaluation of daylight or diurnally averaged photolytic rate coefficients in atmospheric photochemical models
Abstract
An accurate simplified method of computing the daylight or diurnally averaged photolytic rate coefficient valid over the entire range of optical depths, solar positions and latitudes has been developed using analytic expansions. The maximum error of these expansions at a given wavelength is less than 2%. Since the photolytic rate coefficient is usually evaluated over a finite absorption bandwidth, the error in computing the total rate coefficient cm he much less than 2%. These expressions can and have been used efficiently in a numerical atmospheric photochemical model resulting in substantial savings in computation time without a sacrifice in accuracy.
 Publication:

Journal of Atmospheric Sciences
 Pub Date:
 September 1978
 DOI:
 10.1175/15200469(1978)035<1726:EODODA>2.0.CO;2
 Bibcode:
 1978JAtS...35.1726K
 Keywords:

 Atmospheric Chemistry;
 Atmospheric Models;
 Diurnal Variations;
 Ozonometry;
 Photodissociation;
 Reaction Kinetics;
 Computerized Simulation;
 Sunlight;
 Time Dependence;
 Two Dimensional Models;
 Zenith;
 Geophysics