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Fig. 5.4a,b. Results of the retrieval of the vertical temperature profile: a from the data of the
airborne sounding 16th October 1983 above the Kara-Kum Desert, b from the data of the
airborne sounding 29th April 1985 above Ladoga Lake. Dotted line indicates the a priori
profile
temperature profile are inevitable because of the existence of the observational
uncertainties within the oxygen band.
In this connection, the question of the possibility of using the radiosounding
data for the irradiance data processingwas discussed even in the 70th, while ac-
complishing the described experiments (e. g. Kondratyev et al. 1977). However,
the geographical regions of the experiments differed with their microclimatic
properties. The weather and atmospheric conditions above Ladoga Lake varied
fromthoseabovetheshorepoints,wheretheradiosoundingwasaccomplished.
While carrying out the observations above the Kara-Kum Desert, the nearest
point of the radiosounding was the city Krasnovodsk at the Caspian Sea shore,
where the weather and atmospheric conditions were essentially different than
in the center of the desert (200 km from Krasnovodsk). Therefore, it was de-
cided not to use the data of the direct measurements of the temperature and
humidity profiles in the nearest points to the sites of the observations.
Figure 5.5 illustrates the examples of the retrieved water vapor vertical pro-
files.Asfollowsfromthepreviousanalysisofthederivatives,H 2 Oabsorption
bands together with the oxygen absorption bands are the only spectral regions,
where the essential temperature dependence of the irradiance exists. Thus, the
significant uncertainties mentioned above could affect only H 2 Ocontentpro-
file. However, as has been mentioned above, the retrieval of the temperature
and humidity is not of practical interest, and the pointed systematic uncer-
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