Accession Number:

ADA180050

Title:

Infrared Sky Radiance Distributions in the Marine Boundary Layer.

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

Report Date:

1987-01-01

Pagination or Media Count:

25.0

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.

Subject Categories:

  • Optics
  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE