AIRBORNE OBSERVATIONS OF CLOUD PARTICLES AND INFRARED FLUX DENSITY (8-14 MICRONS) IN THE ARTIC,

摘要

Apparent sky and earth temperatures were measured from an airplane during the winter months of 1967at Barrow,Alaska. A portable 8-14micron radiometer with a 2-degree field of view monitored the apparent temperatures at 10degree zenith angle intervals. The temperatures were converted to radiances,and the radiances summed to obtain the upward and downward hemispherical fluxes. The absorption effects of clouds and ice crystal hazes were examined by making flights above and below the overcasts. The diamond dust haze had very little effect on the infrared transmission. During haze conditions the 1960 Elsasser data for atmospheric water vapor and carbon dioxide absorption-emission described the transfer. Cloud transmission-emission calculations agreed with the results of Yamomoto et al. (1966). The comparisons with Yamomoto's findings required cloud particle information. Cloud particle distributions and concentrations were computed from the Formvar replicas collected with a continuous particle sampler. The modal volume radius for the water droplet clouds was 9microns. The ice crystal hazes consisted of a mixture of plates,columns,and irregular crystals in concentrations similar to those found in cirrus clouds. (Author)