Reflectance of snow measured in situ and from space in sub-Arctic areas in Canada and Alaska

Visible and near-infrared measurements of clean snow and dirty snow (both actively melting) were acquired near Yellowknife, NWT, Canada, and over snow-covered glaciers in Alaska. The in situ reflectance at nadir of the dirty snow was approximately 30% lower in the visible part of the spectrum than that of the cleaner snow near Yellowknife. The reflectance curves for the dirty snow are flatter than the curves for the clean snow. The shape of the reflectance curves of actively melting snow near Yellowknife versus fresh snow measured in Alaska was similar in the visible region of the spectrum, but diverged in the near-infrared region. In Alaska, the off-nadir look angle measurements of snow consistently exceeded 1.0 because of enhanced forward scattering. The shape of the reflectance curves and the anisotropic reflectance properties are found more useful in differentiating snow type and moisture state than are actual reflectances. >

[1]  Jeff Dozier,et al.  Snow Reflectance from LANDSAT-4 Thematic Mapper , 1984, IEEE Transactions on Geoscience and Remote Sensing.

[2]  B. Choudhury,et al.  The albedo of snow for partially cloudy skies , 1981 .

[3]  Antony D. Clarke,et al.  Soot in the Arctic snowpack: a cause for perturbations in radiative transfer , 1985 .

[4]  S. Warren,et al.  A Model for the Spectral Albedo of Snow. II: Snow Containing Atmospheric Aerosols , 1980 .

[5]  Stephen G. Warren,et al.  ReviewImpurities in snow: effects on albedo and snowmelt , 1984 .

[6]  Jeff Dozier,et al.  Snow Mapping and Classification from Landsat Thematic Mapper Data , 1987, Annals of Glaciology.

[7]  B. Barkstrom.  Some Effects of Multiple Scattering on the Distribution of Solar Radiation in Snow and Ice , 1972 .

[8]  G. Leshkevich.  Machine classification of freshwater ice types from landsat—I digital data using ice albedos as training sets , 1985 .

[9]  Dorothy K. Hall,et al.  Reflectances of glaciers as calculated using Landsat-5 Thematic Mapper data , 1988 .

[10]  Stephen G. Warren,et al.  Optical Properties of Snow , 1982 .

[11]  Liang Fengxian,et al.  STUDY ON SPECTRAL REFLECTION CHARACTERISTICS OF SNOW, ICE AND WATER OF NORTHWEST CHINA , 1984 .

[12]  Problems of determining snow albedo for the high arctic: Research note , 1984 .

[13]  J. L. Barker,et al.  Landsat MSS and TM post-calibration dynamic ranges , 1986 .

[14]  J. Dozier.  Spectral Signature of Alpine Snow Cover from the Landsat Thematic Mapper , 1989 .

[15]  R. C. Hubley.  Measurements of Diurnal Variations in Snow Albedo on Lemon Creek Glacier, Alaska , 1955, Journal of Glaciology.

[16]  Jack J. Hsia,et al.  Reflection properties of pressed polytetrafluoroethylene powder , 1981 .

[17]  T. Eck,et al.  Diurnal Patterns of the Bi-Directional Reflectance of Fresh-Water Ice , 1990, Annals of Glaciology.

[18]  R. Beschta,et al.  Snowpack albedo and snow density , 1979 .

[19]  S. J. Bolsenga.  Spectral reflectances of snow and fresh water ice from 340 through 1100 nm , 1983 .

[20]  P. Deschamps,et al.  Description of a computer code to simulate the satellite signal in the solar spectrum : the 5S code , 1990 .

[21]  V. V. Salomonson,et al.  Anisotropic Solar Reflectance over White Sand, Snow and Stratus Clouds. , 1968 .

[22]  Frank D. Eaton,et al.  Some Characteristics of the Albedo of Snow , 1975 .

[23]  Peter C. Mullen,et al.  Theory of the optical properties of lake ice , 1988 .

[24]  J. Foster,et al.  Comparison of in situ and Landsat derived reflectance of Alaskan glaciers , 1989 .

[25]  D. Hall,et al.  Satellite-derived reflectance of snow-covered surfaces in Northern Minnesota , 1990 .

[26]  G. Shaw,et al.  The Asian source of Arctic haze bands , 1977, Nature.

[27]  Thomas C. Grenfell,et al.  Scattering of visible and near infrared radiation by NaCl ice and glacier ice , 1983 .

[28]  S. Warren.  Impurities in Snow: Effects on Albedo and Snowmelt (Review) , 1984, Annals of Glaciology.

[29]  Jeff Dozier,et al.  Effect of grain size and snowpack water equivalence on visible and near‐infrared satellite observations of snow , 1981 .

[30]  V. Ramaswamy,et al.  Albedo of soot‐contaminated snow , 1983 .