Accession Number:

ADA007732

Title:

Red and Near-Infrared Spectral Reflectance of Snow.

Descriptive Note:

Research rept.,

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H

Personal Author(s):

Report Date:

1975-03-01

Pagination or Media Count:

24.0

Abstract:

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.

Subject Categories:

  • Snow, Ice and Permafrost
  • Infrared Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE