Geoscience Reference
In-Depth Information
Determination of Parameters
of the Atmosphere and the Surface
in a Clear Atmosphere
This chapter provides a concrete statement of the complex inverse problem of
the retrieval of atmospheric and surface parameters from the observational
data considered in Chap. 3. The problem is solved applying the methods dis-
cussed in Chap. 4. This chapter concerns the following: the etalon algorithm
and accuracy estimation of different simplifications and approximations while
computing irradiances, the approach and formulas for calculating the deriva-
tives of the irradiances with the Monte-Carlo method, and inverse problem
solving with analysis of the obtained results.
5.1
Problem statement. Standard calculations of Solar Irradiance
The results of soundings (the airborne observations of solar spectral irradi-
ances) in the clear atmosphere have been presented in Chap. 3. These ob-
servations were intended for the calculations of spectral radiative flux in the
atmospheric layers; this analysis is also presented in Chap. 3. However, the
contemporary algorithms of the inverse problems solving described in the
previous chapter give the possibility of reprocessing the mentioned experi-
mental data aimed at a more complete and correct extraction of the infor-
mation concerning the aerosol and gaseous composition of the atmosphere,
and to the approbation of the operative approaches of similar observational
results. Incidentally, the processed results have lost their actuality from the
point of real-time monitoring, but they have not become outdated as a series
of unique experimental observations, useful for adequate modeling of the op-
tical properties of atmospheric aerosols and for correct comparison between
the results of model calculations and experimental data. At the same time, the
existing data set allows elaboration of the approaches for real-time monitoring
of the composition and structure of atmosphere and elucidating the technical
and methodological shortcomings of the accomplished experiments for the
purpose of its removal during further experiments.
To solve the stated problemwe will follow the scheme presented in Sect. 4.1.
Its first stage is the model selection for the direct problem solving and the es-
timation of the uncertainties of the obtained results. As per Sect. 4.4 the etalon
algorithm for modeling the observational values while taking into account the
processes of the radiation interaction in the atmosphere with maximal accu-
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