Atmospheric Turbulence over the Large City. 1st Report

[摘要] Atmospheric turbulence was observed by using a hot-wire anemometer and an electromagnetic oscillograph at the Central Meteorological Observatory (Tokyo) in autumn, 1946. _??_e hot-wire anemometers were equipped. to a wireless tower at 60, 55, 45, 35 and 25 meters above the ground. From the records of velocity fluctuations for ten minutes, we Calculated the following quantities; mean velocity (_??_), energy of turbulence (1/2_??_2 ), intensity of turbulence (√_??_2/_??_), frequency distribution of u'-fluctuation and eddy viscosity. A linear relation was seen between the mean velocity and the logarithm of height. 1/2_??_2/_??_and √_??_2/_??_ were larger than those which were expected from the experiment in the wind tunnel. The vertical distributions did not show any regularity. The authors further discussed on the magnitudes and vertical distributions of eddy viscosity.

[学科分类] 大气科学