Abstracts

Novosibirsk participants

Artificial aerosol clouds are widely used to study atmospheric diffusion in surface and boundary atmospheric layers. As a rule, these experiments involve either thermocondensation aerosol generators or pyrotechnical smoke-boxes. In this case, the particles of submicron size form that can be considered as a weightless impurity. In most cases, experiments on artificial clouds were carried out in conditions of the horizontally homogeneous underlying surface. This simplified the use of the technique of experimental determination of the parameters of atmospheric diffusion. Dimensions of an aerosol cloud in the experiments available in the literature do not exceed several hundreds meters. In a given experiment, the aerosol cloud was created using a generator which allows one to produce particles of both submicron and greater sizes (tens of microns). The particle size distribution of forming particles is rather wide. It is possible also to change the power of the forming cloud. When the power of aerosol generator is maximal, the cloud is visualized at a distance of more than one kilometer.

This report describes experiments performed in autumn of 2000. The size of an aerosol cloud was determined with the help of traditional camera "Zenit" and the digital one "Casio QVX-3000". Experiment was performed on the bank of the Novosibirsk artificial lake on a ground covered with grass and trees. The behavior of an aerosol cloud has been studied at a distance of about 100 m from the generator working continuously in two regimes. It was started every evening and every morning. The data are given on a change in the form of an aerosol cloud for different stratifications of the atmosphere depending on the regime of its formation. The data on the geometrical dimensions of smoke tail are used to find out the new potentialities of the technique proposed for studying aerosol cloud dispersion in conditions of thermic and dynamic inhomogeneities of underlying surface.

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