Abstract
The authors measured air temperatures at 1.5m above the ground every 10 minutes at various elevations 135m-345m) on the slope of a caldera basin (Akaigawa Basin, Hokkaido) during two periods (July to October 1987 and May to October 1988). The relationships between elevation and effective accumulated temperature (base temperature=5°C), average diurnal range of air temperature are analyzed by these data (see Fig. 1 and Fig. 2). The relationships in 1987 and 1988 had small differences.The dates when certain low temperatures occured at any elevation for the first time are shown (see Fig. 3). The finding suggests that the dates can be estimated using the daily minimum air temperature gradients calculated by the equation (see Eq. (1)) presented by the former article (Aoki et al., 1992).
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