Accession Number:

ADA172230

Title:

Emissivity as a Function of Surface Roughness: A Computer Model.

Descriptive Note:

Memorandum rept. Sep 84-Aug 85,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

• Schwartz,Ira B.
• Hon,David

Report Date:

1986-08-29

Pagination or Media Count:

35.0

Abstract:

Surface geometry plays an important role in modelling backgrounds in the infrared. In particular, surface roughness of the ocean varies as a function of wind speed, and therefore it is important to realize the impact of surface roughness on self-emissions over a wide range of wavelengths and wind speeds. This paper describes the results of a computer model used to generate a synthetic surface as a function of wind speed on the average emissivity of the given surface. Surfaces generated with varying spectral content are compared. Capillary waves are shown to have a measurable effect on the average emissivity of the ocean surface, and therefore should not be ignored when constructing a model of the ocean surface. Keywords Emissivity Infrared Surface roughness Sea surface modelling.

Descriptors:

• *OCEAN SURFACE
• *SURFACE ROUGHNESS
• *EMISSIVITY
• COMPUTERIZED SIMULATION
• FREQUENCY
• FUNCTIONS
• GEOMETRY
• WIND VELOCITY
• OCEANS
• RANGE(EXTREMES)
• INFRARED RADIATION
• BACKGROUND RADIATION
• OCEAN MODELS
• RADIOMETRY
• CAPILLARY WAVES

Subject Categories:

• Physical and Dynamic Oceanography
• Infrared Detection and Detectors
• Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE