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 (190Kb)
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31,061,000 Yen
Polar stratospheric clouds(PSCs) play important roles in the mechanism of ozone depletion. In order to clear the generation and extinction processes of PSCs, we developed an experimental apparatus and a method to generate the particles, which are the models of PSCs, and developed an in-situ measurement system of the particles in this subject.
The generator of model particles was designed based on the analysis of the condensation growth, coagulation growth and the deposition of particles, and was constructed. It is the laminar flow type system which consisted of a premixing room and a condenser tube. An numerical simulator to calculate simultaneously the changes of gases and particles in the generator by FDM was developed. As the results of the simulation, the experimental conditions were decided in which nitric acid vapor and water vapor would co-condense to solid particles. It was shown these conditions could be realized in the developed generator.
We also constructed an in-situ measurement system for the model particles by static/dynamic light scattering methods. We developed the ultra-high-frequency batch-type correlator system, which was used complementary with real-time correlator, in order to measure small and low-concentration particles. The fiber optical probe were also developed in order to enable measurements in the generator. It was shown that this system has enough performance to measure the model particles which would be generated.
As the results of this subject, it were realized that the condition in which the model particles of PSCs would be generated and that the equipment to measure the model particles.
Ozone layer, PSCs, Formation process, Particle generation, In-situ measurement