Red and Near-Infrared Spectral Reflectance of Snow.

The spectral reflectance of snow in the range of 0.60 to 2.50 micrometers wavelengths was studied in a cold laboratory using natural snow and simulated preparations of snow. A white barium sulfate powder was used as the standard for comparison. The high reflectance (usually nearly 100%) of fresh nat...

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Bibliographic Details
Main Authors: O'Brien,Harold W., Munis,Richard H.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Format: Text
Language:English
Published: 1975
Subjects:
Snow
Ice and Permafrost
Infrared Detection and Detectors
*SNOW
TEMPERATURE
AGING(MATERIALS)
INFRARED DETECTORS
REFLECTANCE
NEAR INFRARED RADIATION
INTERMEDIATE INFRARED RADIATION
MULTIBAND SPECTRAL RECONNAISSANCE
Spectral reflectance
Remote sensing
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA007732
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA007732
Description
Summary:The spectral reflectance of snow in the range of 0.60 to 2.50 micrometers wavelengths was studied in a cold laboratory using natural snow and simulated preparations of snow. A white barium sulfate powder was used as the standard for comparison. The high reflectance (usually nearly 100%) of fresh natural snow in the visible wavelength declines rapidly at wavelengths near and beyond 0.80 micrometers, as the spectral absorption coefficients of ice increase. The rate of decline of near-infrared reflectance due to aging is strongly affected by the history of the snow during aging. Snow aged under certain conditions may retain 90% or so of its reflectance in the visible red, yet may be only about 10% as reflective as the original fresh snow beyond 2.2 micrometers. Several environmental factors such as ambient temperature and wind effects which contribute to the variability in snow reflectance are discussed. Sponsored in part by National Oceanic and Atmospheric Administration, Washington, D.C.

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