Analysis of Radiative Observations in Cloudy Atmosphere - Short-Wave Solar Radiation in the Earth's Atmosphere - page 240

µ is 0.35-0.95 m and the data set contains 180 wavelength points. The ground

albedo were obtained from the measurements as F ↑ ( τ 0 ) | τ 0 ): experiment 6 F ↓ (

∼ ∼

- A 0.65 (snow surface).

Equations (6.20) and (6.21) for the retrieval of values s 2 and

0.2 (water surface) and experiment 7 - A

τ in the system
of cloud layers have been applied to the data of experiment 6, and (6.3)-(6.5)
for the retrieval of values s 2 and τ inoneinhomogeneouslayerhavebeen

applied to the data of experiment 7. The results (single scattering albedo and
optical thickness) are presented in Tables A.13 and A.14 of Appendix A for both
experiments. There has been no problemwith the interpretation of the data of
experiment 6. The magnitudes of the optical thickness of four cloud sublayers
haveturnedouttobehighenoughandtheprocessingerrorsarelessthan
the observational uncertainty. As a result, the errors of the retrieved optical
parameter in experiment 6 are ∆τ|τ ∼ 10%. It is necessary to

point out that experiment 6 has been carried out with the earlier version of
the spectrometer and experimental uncertainty (

∆ | s s ∼ 6% and

∆ F ↑↓ |

F ↑↓ ∼

5−7%) is higher

∆ F ↑↓ | F ↑↓ ∼ than the uncertainty of experiment 7 ( 1−2%), which has been

carried out with the improved version of the spectrometer. This difference is
expressed with the stronger oscillations on the curves of experiment 6 than
they are on the curves of experiment 7. In experiment 7 for the bottomsublayer
the negative values of s 2 have been obtained because the absorptionwas strong
and the optical thickness was too small. Thus, the asymptotic formulas are off
the applicability range in this case. It corresponds to the solution expressed
through a discontinuous function that yields the absence of solution as per to
Sect. 6.3.

Fig. 7.3a,b. Spectral values of the volume scattering coefficient of the cloud layers between
the measurement levels retrieved from experiment 6 -( a )and7-( b ); digits in figures
indicate layer's number: a 1 - layer 4.1-3 km;2-3.0-1.6km;3-1.6-0.6km; 4 - 0.6-0.05 km;
b 1 - layer 1.4-1.3 km,2-1.3-1.2km,3-1.2-1.1km,4-1.1-0.9km, 5 - 0.9-0.8 km