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Fig. 5.2a,b.
Comparison of the limited accuracy of the observations -
solid lines
and esti-
mation of the calculation uncertainty -
dashed lines
:
a
for downwelling irradiance;
b
for
upwelling irradiance:
upper dotted line
-observationabovethewatersurface,
lower lines
-
above the sand and snow surfaces
solution. Figure 5.2 illustrates the results of the comparison together with the
limit accuracies of the observations including the uncertainty of the instru-
mental function equal to 1%. The uncertainty of the downwelling irradiance
calculationisseensignificantlylessthantheuncertaintyofitsobservations
(excludes the molecular absorption bands in the NIR spectral region). The
analogous picture is demonstrated for the upwelling irradiances above the
sand and snow. Regretfully, the uncertainty of the calculations of the upwelling
irradiances above the water surface exceeds the observational uncertainty.
The physical reason of this obstacle is the following. The upwelling irradiance
measured above the dark water surface has formed owing to the radiation
scattering in the atmosphere, and therefore, it needs higher accuracy of the
numerical simulation. The obtained uncertainties of the calculation should be
added to the observational uncertainties during the inverse problem solving
as per Sect. 4.4.
Scrutinize the technical testing of the computer codes used for the calcu-
lations. The correspondence of the computer code to the initial mathematical
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