Measurement of thermal belt on the slope of Mt. Osa by using infrared thermometer.

KUROSE Yoshitaka, MAKI Taichi

doi:10.2480/agrmet.43.275

In order to study the process of the formation of the thermal belt (warm area in the middle of mountain) and the relationship between inversion region and katabatic wind, the micrometeorological observations and thermal image analysis of the northern slope of Mt. Osa were carried out. The remarkable development of thermal belt was found on the slope. The results of the observations were summarized as follows: (1) During the observation period, the center of thermal belt formed at the height of 250±50m above the sea level. When katabatic wind was strong, the center of thermal belt moved to the lower part of the mountain. On the other hand, when the wind was weak, it moved to the upper part. (2) When inversion region developed in this observation period, three regions were distinguished on the slope. In upper region, surface temperature fell with elevation. Middle (second inversion region) and lower region (first inversion region) were inversion regions. In each region, minimum surface temperature is proportional to the elevation. On the lower region, rate of minimum surface temperature decrease is higher than in the middle region. Boundary of the inversion regions was found at the height of 110-130m. (3) The surface of the inversion region was warmed by the katabatic wind. (4) The katabatic wind usually penetrated into the inversion region. Higher wind speed and longer period of wind promoted the penetration.

Measurement of thermal belt on the slope of Mt. Osa by using infrared thermometer.

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