Accession Number:

ADA110868

Title:

Near-Infrared Reflectance of Snow-Covered Substrates,

Descriptive Note:

Corporate Author:

COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s):

Report Date:

1981-11-01

Pagination or Media Count:

24.0

Abstract:

The reflection of solar radiation by a snow cover in situ and the apparent influence of selected substrates were examined in wavelength bands centered at 0.81, 1.04, 1.10, 1.30, 1.50 and 1.80 micrometers. Substrates included winter wheat, timothy, corn, alfalfa, grass, concrete and subsurface layers of crusty snow and ice. Reasonable qualitative agreement between measurements and theoretical predictions was demonstrated, with indications of quantitative agreement in the definition of a semi-infinite depth of snow cover. It was concluded that ultimate quantitative agreement between theory and measurement will require that an optically effective grain size be defined in terms of physically measuarable dimensions or meteorologically predictable characteristics of the ice crystals composing the snowpack. Author

Subject Categories:

  • Snow, Ice and Permafrost
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE