Local Climatic Characters of “Yamase” Wind

Simultaneous observations at 4 points were made in July, 1970 in the plain of the Oirase river, Aomori prefecture in order to investigate the characteristics of Yamase wind.The observational stations were established, one at the seaside and the other three on some rice fields of inland at distances of 4, 12 and 28km from the coast respectively. Observations were made for micrometeorological elements in general up to the height of 1m above the ground.The effects on Yamase wind passing from coast over inland were generally slowing down of the velocity, the humidity and water drops in the atmosphere were decreased, and the temperature rose.The air temperature at a linear distance of 10km from coast was about 2°C higher than that of the coast. The rate of increase in air temperature was affected by solar radiation energy.When Yamase wind is broken up by obstructions like houses and trees, the wind velocities and water content in the atmosphere are significantly affected.At the base of the mountains the thickness of layer of clouds increased. Furthermore the solar radiation energy decreased and the air temperature was lower during heavy Yamase wind.It was considered that these phenomena were influenced by the location of the mountain.