Showing posts with label albedo. Show all posts
Showing posts with label albedo. Show all posts

Thursday, 19 June 2014

Albedo

The amount of sun's rays that is reflected by an earthly body is called albedo. The word albedo is derived from albus, a Latin word for white.

Albedo is a measure of how much light that hits a surface is reflected without being absorbed.  Something that appears white reflects most of the light that hits it and has a high albedo, while something that looks dark absorbs most of the light that hits it, indicating a low albedo.


It is the reflection of a certain area of earth, like snow and mountains, on the surface. 
For example, the albedo of snow covered mountains hurts the eyes. 

Material
Albedo values (% reflected)
Fresh snow
            80% - 95%
Light roof
            35% - 50%
Grass
            25% - 30%
Bricks and stone
            20% - 40%
Concrete dry
            17% – 27%
Water bodies
            10% - 60%
Forest
            10% - 20%
Crops and grassland
            10% - 25%
Dark roof
            8% - 18%
Asphalt
            5% - 10%
Earth’s albedo (average)
            31%