Articles | Volume 17, issue 23
https://doi.org/10.5194/acp-17-14353-2017
https://doi.org/10.5194/acp-17-14353-2017
Research article
 | 
04 Dec 2017
Research article |  | 04 Dec 2017

Sky radiance at a coastline and effects of land and ocean reflectivities

Axel Kreuter, Mario Blumthaler, Martin Tiefengraber, Richard Kift, and Ann R. Webb

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Short summary
We have done measurements of the sky's brightness at the Italian coast and show the influence of the underlying surface: looking towards the land, the sky can be up to 50 % brighter than opposite viewing directions towards the ocean as a result of higher land reflectivity. At low solar elevations, the specular reflection from the ocean, or sun glint, increases the zenith brightness. Understanding these effects requires a 3-D model and is important when retrieving, e.g., aerosol properties.
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