The troposphere-stratosphere radiation field at twilight - A spherical model

Details The troposphere-stratosphere radiation field at twilight - A spherical model The troposphere-stratosphere radiation field at twilight - A spherical model

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31.1517a&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, Dec. 1983, p. 1517-1523. FAA-supported research.

Computer Science

48

Atmospheric Models, Radiation Distribution, Stratosphere, Troposphere, Angular Distribution, Photodissociation, Reaction Kinetics, Solar Position, Vertical Distribution

Scientific paper

Time-dependent calculations of trace-constituent distributions require as input the dissociating radiation field as a function of altitude and solar zenith angle. An isotropic, spherical, multiple-scattering model of the radiation field has been developed to determine the radiation field at twilight. Comparison of the spherical model with a plane-parallel model at twilight shows that: (1) for solar zenith angles less than 92 deg, plane-parallel solutions for the source function are suitable if the initial deposition of solar energy is calculated for a spherical atmosphere; (2) for solar zenith angles greater than 92 deg, the plane-parallel radiation field can be several orders of magnitude smaller than that calculated with the spherical model; (3) at altitudes above 40 km and at all solar zenith angles, the spherical model predicts 10-20 percent less radiation than the radiation field calculated with the plane-parallel model. Calculations of the rate of photodissociation of NO2 in the troposphere and stratosphere show that the spherical model yields significantly higher values at solar zenith angles greater than 92 deg.

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