Аннотация:The statistical relations between surface concentrations of minor atmospheric gases have been studied. As it was found a relation between concentrations of gases having the same sources (e.g., fuel burning for NO and CO) is close to linear trend. On the other hand, two species which are both a source and a sink to each other (e.g., O3 and NO) demonstrate hyperbolical regression line. Finally, concentrations of two species one of which is partially a source for another (e.g., NO and NO2) demonstrate exponential (logarithmic) type of trend. However, real relations between concentrations of two minor gases for any day represent non-homogeneous and complicated closed graphs like Carno cycle. As it was found a structure of these graphs during a day may be successfully explained by dynamics of the thermal stratification with the use of sodar data. Two examples of this analysis have been demonstrated.