Infrared Sky Radiance Distributions in the Marine Boundary Layer.

Abstract

This report describes an alternative method for inferring the effects of aerosols on atmospheric transmittance. Spatial distributions of infrared sky radiance in the 3 to 5 micrometer (SWIR) and 8 to 12 micrometer (LWIR) spectral bands were measured at low elevation angles above the sea surface, then compared with the corresponding clear sky radiance. The infrared aerosol transmittance was inferred from the ratio of measured radiance to calculated clear sky radiance along the horizon line of sight (LOS). Results show that only the LWIR band can be used to infer aerosol transmittance reliably. The radiance along the horizon LOS originates predominately in the lowest 100 m of the atmosphere; therefore, reasonably accurate horizon radiance of transmittance predictions could be made from meteorological data within this low altitude. Keywords: Infrared sky radiance distributions; Atmospheric transmittance; Aerosols.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1987
Accession Number
ADA180050

Entities

People

  • D. Law
  • W. J. Schade

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Abstracts
  • Air Temperature
  • Altitude
  • Atmospheres
  • Boundary Layer
  • Computers
  • Data Sets
  • Detectors
  • Elevation
  • Isotherms
  • Line Of Sight
  • Low Altitude
  • Low Elevation
  • Measurement
  • Radiation
  • Solar Radiation
  • Transmittance

Fields of Study

  • Environmental science

Readers

  • Aerosol Science/Aerosol Physics
  • Image Processing and Computer Vision.
  • Radar Systems Engineering.

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference