spectral composition of the incident solar flux, the upwelling radiance L w ðþ0; lÞ
proves to be inconvenient for further analysis of the influence exerted by the suit of
various inherent light transfer processes on the water leaving signal. It is more
convenient to use for this purpose the coefficient of light diffuse reflection in water
just beneath the atmosphere-water interface, RðÀ0; lÞ, which is intimately/
functionally related to the upwelling radiance, L w ðþ0; lÞ.
By definition, RðÀ0; lÞ is the upwelling irradiance, E u ðÀ0; lÞ just beneath the
water surface normalized to the downwelling irradiance, E d ðÀ0; lÞ at the same
level/vertical distance from the interface (see Table 16.7):
R À0; l
ð
Þ¼
E u À0; l
ð
Þ
E d À0; l
ð
Þ
(16.1)
Fig. 16.2 Simulated total
coefficient of water column
diffuse reflection, R tot (À0,l)
for the input data given in
Table 16.6
Table 16.5 Input data for simulating the resulting coefficient of water column diffuse reflectance,
R tot (À0,l)
C chl , mg/l C sm , mg/l C doc , mgC/l y 0 , degree h, m chl, rel.
units, %
Bottom
cover type
Curve in
Fig. 16.1
0.1
0.1
0.1
30
100
3.0
Sand
1
3.0
0.1
0.1
30
100
3.0
Sand
2
Table 16.6 Input data for simulating the water column total coefficient of diffuse reflection,
R tot (À0,l)
C chl , mg/l C sm , mg/l C doc , mgC/l y 0 , degree h, m chl, rel. units, % Bottom
cover type
Curve in
Fig. 16.2
0.1
0.1
0.1
30
100 3.0
Sand
1
0.1
0.1
0.1
60
100 3.0
Sand
2
16.2 Mechanisms of Interactions of Solar Light
161