Radiative cooling computed for model atmospheres

Details Radiative cooling computed for model atmospheres Radiative cooling computed for model atmospheres

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apopt..21.4381e&link_type=abstract

Applied Optics, vol. 21, Dec. 1, 1982, p. 4381-4388. Research supported by the Naturvetenskapliga Forskningsradet and Styrelsen

Physics

Optics

9

Atmospheric Models, Radiant Cooling, Radiative Heat Transfer, Sky Radiation, Aerosols, Atmospheric Moisture, Computer Programs, Infrared Spectra, Ozone, Zenith

Scientific paper

The radiative cooling power and temperature drop of horizontal surfaces are evaluated on the basis of calculations of spectral radiance from model atmospheres representative of various climatic conditions. Calculations of atmospheric radiance from the zenith and from off-zenith angles were performed with the LOWTRAN 5 atmospheric transmittance/radiance computer code (Kneizys et al., 1980) for model atmospheres corresponding to the tropics, midlatitude summer, midlatitude winter, subarctic summer, subarctic winter and the 1962 U.S. standard atmosphere. Comparison of the computed spectral radiance curves with the radiative fluxes from blackbody surfaces and ideal infrared-selective surfaces (having reflectance in the 8-13 micron range and unity reflectance elsewhere) at various ambient-surface temperature differences shows cooling powers to lie between 58 and 113 W/sq m at ambient temperature for a freely radiating surface, with maximum temperature differences of 11-21 C for a blackbody and 18-33 C for an infrared-selective surface. Both cooling powers and temperature differences were higher for surfaces exposed only to atmospheric zenith radiance. In addition, water vapor content is found to affect strongly the radiative cooling, while ozone and aerosol contents had little effect.

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