The Optical Properties of Young Sea Ice

• Main Author: Perovich,Donald Kole
• Other Authors: WASHINGTON UNIV SEATTLE DEPT OF ATMOSPHERIC SCIENCES
• Format: Text
• Language: English
• Published: 1979
• Subjects: Snow; Ice and Permafrost; Optics; *OPTICAL PROPERTIES; *SEA ICE; POLAR REGIONS; TEMPERATURE; EXPERIMENTAL DATA; LABORATORY TESTS; TEST METHODS; THERMISTORS; SALINITY; COLD WEATHER TESTS; WUNR307252; Ice; permafrost; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/ADA074908; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA074908

Eight laboratory experiments were performed to determine the optical properties of young salt ice and to examine correlations between the optical properties and the state of the ice. Ice grown at different temperatures (-10, -20, -30, and -37 C) and from water of different salinities (0, 16, and 31 0/00) was investigated. The experiments were conducted using a tank system which was designed to grow ice similar to that found in nature, allow an accurate determination of the state and structure of the ice, and permit in situ optical measurements to be made. A four stream discrete ordinates photometric model was developed to treat the case of a floating ice slab. The model included both anisotropic scattering and refraction at the boundaries. The effects on albedo and transmittance of vairaitions in such model parameters as the single scattering albedo and the phase function were investigated. Using one and two layer models, theoretical albedos and transmittances were compared to experimental values. The four stream model was further applied to investigate such topics as the depth dependence of irradiance, cases of direct beam incident radiation, the spectral dependence of albedo and transmittance, and the effects of surface layers. It was suggested that future laboratory research be oriented towards determination of single scattering albedos and phase functions for an extensive range of ice types.