角田盆地の霜害分布と夜間気温の特性

概要

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In the Kakuda Bain, lying in the southeastern part of Miyagi Prefecture, many mulberry trees are planted for sericulture. These trees frequently suffer frost damage in this basin during the late spring, although the degree of frost damage varies greatly from place to place. This paper is to analyse regional differences in frost damage according to variations in nocturnal air temperature and air cooling processes.<BR>Strong nocturnal cooling takes place under clear and calm weather conditions (Figs. 5-11). The distribution of degree of frost damage and the distribution of minimum air temperature, however, are not always found to coincide (Table 2).<BR>In the deeper part of the basin, the air temperature continuously declines from sunset to dawn and plants are severely damaged by this long duration of cold air. At the mouth of the Abukuma River, on the other hand, air temperature fluctuates widely, and low air temperature does not continue through the night. It is supposed that this fluctuation results in the lack of frost damage. The fluctuation appears to be the result of the alternative effects of two air masses, one of which is warm and originates from the Abukuma River, and the other, which is cold and forms in the deeper part of the basin (Figs. 12 and 13).
東北地理学会の論文