Utility of Quasi-real Scale Artificial Cloud Experimental System (ACES)

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A quasi-real scale cloud (about 300 m depht) is formed a long vertical shaft under the ground. Hanging a specially designed cage on an iron rope, we can measure air temperature, relative humidity, air pressure, vertical wind speed, visibility, and size distributions of aerosol particles and cloud droplets. In addition to these measurements, we can collect cloud water, individual aerosol particles and air.The Artificial Cloud Experimental System (ACES) has four unigue features :(1) A Quasi-real scale cloud is formed in the adiabatically ascending air.(2) Processes included in a cloud are more complicated than those of natural clouds.(3) We can repeatedly make experiments under the same condition without influence of weather.(4) Since this system is nearly one-dimensional and keeps nearly steady state, we can compare the experimental results with theoretical works on the small number of assumptions.This study introduce ACES and show tentative results which experimentally confirmed the aerosol effect on vertical profiles of air temperature, relative humidity and liquid water content in a cloud.