Sea Surface Infrared Radiance Simulator. Part 1: Roughness and Temperature Models of the Sea Surface Radiance
DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA)
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This manuscript is the first in a sequence of documents that describe the development and verification of the various components of a sea surface infrared radiance simulator. We have developed an approach to modeling the sea surface radiance in the infrared to include both a coherent ship wake structure and an averaged background component. In this manuscript we discuss the component of the simulator for the ambient sea surface. The contribution from the background sea surface is determined by its roughness and temperature given a defined incident sky radiation. The roughness is largely determined by the wind speed at the sea surface and is described as a probability distribution of slopes of planar facets in the model. Then given the reflectivity and emissivity of the sea surface and their inherent dependencies on angle to the observer, temperature, and roughness we calculate the infrared radiance from the sea surface. We have illustrated the range of behaviour of the sea surface radiance for simple sky radiances at grazing and non-grazing angles as a function of sea roughness and temperature.
- Physical and Dynamic Oceanography