霜冻指数
Comparing to the old microtherm standard for cold of the late spring and late frost index, the new standard is much more flexible and practical.
并与旧标准中的倒春寒和晚霜冻指标进行了对比分析。
According to frost index defined by the minimun temperature ≤ 0 ℃ of earth surface, the criterion for the unusual frost is quantitatively given and the climatic features of the unusual first or last frost in North China during 1953-1990 are studied.
本文利用1953~1990年地面最低温度资料,并以≤0℃作为霜冻指标,定量地确定出现异常霜冻判别标准,研究了华北地区初、终霜冻异常的气候特征。
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