1 June 1998 Vertical variation of extinction and atmospheric transmission due to aerosol particles close above the sea surface in the Mediterranean coastal zone
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Optical Engineering, 37(6), (1998). doi:10.1117/1.601695
Abstract
The vertical variation of extinction and backscatter in the lowest part of the atmospheric mixed layer is of considerable interest for the assessment of the performance of electro-optical systems, but is poorly known. Our purpose is to estimate the vertical variation of extinction and atmospheric transmission due to aerosol particles near the air-sea interface. Atmospheric extinction coefficients in the 3- to 5- and 8- to 12-µm IR bands calculated using vertical aerosol distributions measured in the Mediterranean coastal zone are presented. The data reveal a negative extinction gradient between 1 and 2 to 3 m height during winds of marine origin lower than 9 m/s, whereas a positive gradient occurs between 1 and 2 to 3 m height during high-wind-speed periods (V?9 m/s). A positive extinction gradient is also noted for vertical profiles recorded during moderate continental winds. These extinction gradients result in a relative difference in atmospheric transmission between two sample heights that reach 60% in both the 3- to 5- and 8- to 12-µm bands for an optical path of 10 km during high-wind-speed periods. These observed differences cannot be explained by current models to predict the vertical aerosol distribution.
Jacques Piazzola, Serge Despiau, "Vertical variation of extinction and atmospheric transmission due to aerosol particles close above the sea surface in the Mediterranean coastal zone," Optical Engineering 37(6), (1 June 1998). http://dx.doi.org/10.1117/1.601695
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KEYWORDS
Atmospheric particles

Aerosols

Atmospheric modeling

Ocean optics

Oceanography

Coastal modeling

Particles

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