Geoscience Reference
In-Depth Information
(a)
5780°K
255°K
0.1
1
10
100
Wavelength (µm)
CH
4
H
2
O
(b)
N
2
O
O
2
H
2
O
CH
4
H
2
OH
2
O
CO
2
H
2
O
O
2
CO
2
H
2
O (rotation)
O
2
O
3
CO
2
100
75
50
25
0
11km
100
75
50
25
0
Ground
level
0.1
1
10
100
Wavelength (µm)
1
(c)
Methane (CH
4
)
0
1
Nitrous oxide (N
2
O)
0
1
Oxygen (O
2
)
Ozone (O
3
)
0
1
Carbon dioxide (CO
2
)
0
1
Water vapor (H
2
O)
0
1
Total
Atmosphere
0
0.1
0.2
0.3 0.4
0.6 0.8
1
1.5
2
3
4568
102030
Wavelength (µm)
Figure 4.7 (a) Planck curves at 5780 K and 255 K representing the emission spectra
of the sun and the earth, respectively. The
y
-axis is scaled by multiplying radiance (
B
l
)
by wavelength so the two spectra can be plotted on the same figure (see Exercise 4.2).
(b) Absorption spectra for the stratosphere (top) and the entire atmosphere (bottom).
(c) Absorption spectra for the most important absorbers in the earth's atmosphere.
