Evaluation of Air Temperature Distribution using Thermal Image under Conditions of Nocturnal Radiative Cooling in Winter Season over Shikoku Area.

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  • 四国地域を対象にした熱画像情報による冬期・放射冷却条件下の気温分布の把握
  • シコク チイキ オ タイショウ ニ シタ ネツ ガゾウ ジョウホウ ニ ヨル

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Abstract

Using the thermal images offered by the infra-red thermometer and the LANDSAT, the air temperature distribution over mountainous regions were estimated under conditions of nocturnal radiative cooling in the winter season. The thermal image analyses by using an infra-red thermometer and the micrometeological observation were carried out around Zentsuji Kagawa prefecture. At the same time, the thermal image analyses were carried out by using the LANDSAT data. The LANDSAT data were taken on Dec. 7, 1984 and Dec. 5, 1989. The scenes covered the west part of Shikoku, southwest of Japan.<br>The results were summarized as follows:<br>Values of the surface temperature of trees, which were measured by an infra-red thermometer, were almost equal to the air temperature. On the other hand, DN values detected by LANDSAT over forest area were closely related with air temperature observed by AMeDAS. Therfore, it is possible to evaluate instantaneously a spatial distribution of the nocturnal air temperature from thermal image.<br>The LANDSAT detect a surface temperature over Shikoku area only at 21:30. When radiative cooling was dominant, the thermal belt and the cold air lake were already formed on the mountain slopes at 21:30. Therfore, it is possible to estimate the characteristic of nocturnal temperature distribution by using LANDSAT data.<br>It became clear that the temperature distribution estimated by thermal images offered by the infra-red thermometer and the LANDSAT was useful for the evaluation of rational land use for winter crops.

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