Geoscience Reference
In-Depth Information
1.0
0.8
Clean snow
0.6
Dirty snow
0.4
Pasture/crop
0.2
Forest
Water
Figure 5.5
Typic a l
variation in albedo as a
function of solar altitude
for selected surfaces.
0
0
90
30
60
Solar altitude (
)
Table 5.2
Range of reported values for albedo and emissivity for different surfaces.
Albedo (a)
Surface Type
Specification
Emissivity (
e
)
Water
Small zenith angle
0.03-0.1
0.92-0.97
Large zenith angle
0.1-0.5
0.92-0.97
Snow
Old
0.4-0.7
0.82-0.89
Fresh
0.45-0.95
0.9-0.99
Ice
Sea
0.3-0.4
0.92-0.97
Glacier
0.2-0.4
Bare Sand
Dry
0.35-0.45
0.84-0.9
Wet
0.2-0.3
0.91-0.95
Bare soil
Dry clay
0.2-0.35
0.95
Moist clay
0.1-0.20
0.97
Wet fallow field
0.05-0.1
Paved
Concrete
0.17-0.27
0.71-0.88
Black gravel road
0.05-0.10
0.88-0.95
Grass
0.16-0.26
0.9-0.95
Agricultural Crops
Wheat, rice, etc.
0.1-0.25
0.9-0.99
Orchards
0.15-0.2
0.9-0.95
Forests
Deciduous
0.1-0.2
0.97-0.98
Coniferous
0.05-0.15
0.97-0.99
