Author(s): T. Yamada; T. Hibino; Y. Fujiyoshi; T. Harimaya; M. Inage
Linked Author(s):
Keywords: Cloud Physics; Mixing Ratio; Precipitation; Prototype experiment; Latent heat
Abstract: It has been needed to parameterize and refine the microphysics of cloud formation and pre- ipitation processes through checking in prototype-scale experiments. For this purposes the present uthors constructed the experimental facility of cloud physics in the huge vertical shaft (710m in eep, 5.5m in diameter) of a coal mine in Hokkaido, Japan. Using this facility, some valuable data uch as temperature, relative humidity, air pressure, updraft velocity, cloud particles, rain drop and heir particle size distribution have been obtained at each cross sections in the shaft. Through this xperiments, the following results are obtained. 1) In a shaft, we can observe cloud in humid seasons from June to September. 2) Relative humidity increased vertically. But it does not reach saturation. 3) Temperature is uniformly in each cross section, and its vertical distribution shows two lines with ifferent gradient. 4) At upper points than the cross point, we can observe the formation of cloud article by video amera. 5) Cloud is found even in subsaturated condition.
Year: 1993