ALBEDO AND SKY RADIANCE MEASUREMENTS IN GREENLAND.

• Main Author: Kasten, Fritz
• Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
• Format: Text
• Language: English
• Published: 1966
• Subjects: Atmospheric Physics; Optics; (*ALBEDO(ASTRONOMY); GREENLAND); (*SKY BRIGHTNESS; SNOW; ATMOSPHERES; OPTICAL PROPERTIES; SOLAR RADIATION; METEOROLOGY; Greenland; Ice Sheet
• Online Access: http://www.dtic.mil/docs/citations/AD0635376; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0635376

This paper presents the results of measurements made in June 1961 on the ice sheet of Northern Greenland. The following quantities were measured: total and visual albedo of the snow surface under overcast and blue skies as well as the corresponding albedos in several spectral ranges; vertical distributions of the luminance and of the radiance of densely overcast sky and snow surface in several spectral ranges; and azimuthal distributions of luminance and near-infrared radiance of overcast skies of different densities. The interdependence of these quantities and their relationship to whiteout are discussed on the basis of the measurements. It is concluded that in order to fully or partly overcome whiteout, the luminance distribution must be made more or less nonuniform. This may be accomplished by cloud seeding, dark objects on the ground, or the use of light of other than visible wavelength. (Author)