山地斜面における降雪分布の規則性について

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The distribution of snowfall were investigated in the winter season of 1979-80 along the west slope of Mt. Asahidake (2,290 m a.s.l., 43°40'N, 142°52'E), facing to the cold northwesterly wind of the winter monsoon, the central part of Hokkaido, the northernmost island of Japan (Fig. 1). As the results of investigation, the following simple roles of snowfall distribution along the mountain slope are found : Though the amount of each snowfall hw during several days is not necessarily well approximated by a linear function of altitude z, it generally increases with z (Fig. 4) ; the total amount of hw during some one month obtained by adding hw's is well approximated by a linear function of z (Fig. 5) : The cumulative values of hw (z) at various altitudes z, from January 9 to each observation time are clearly proportional to the cumulative value of hw (z_0) over the same time interval, at the arbitrarily chosen reference site of the altitude ZQ (Fig. 6) ; hence Σh_w(z)=α(z)Σh_w(z_0) : the summation interval is generally arbitrary in the accumulation season of the slope ; the proportional coefficient a (z) is approximated by a linear function of z (Fig. 7) ; α(z)=c(z-z_0)+1. When distributions of hw with z as shown in Fig. 4 are approximated by a linear function of z, the inclination of the function, i.e. the ratio β (=hw (1,400 m)/hw (400m)) may be attributed to the pressure pattern as indicated in Table 1 ; the distribution of snowfall along the mountain slope due to pressure pattern of monsoon type (M-type) may shows greater difference of hw with z than that due to pressure pattern of the winter cyclonic type (L-type), that is, in the snowfall under the pressure pattern of monsoon type, the hw at upper part of the slope is considerably larger than h^w at lower part of it.
北海道大学の論文
1983-08-15

山地斜面における降雪分布の規則性について

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