摘要
利用山东省伏期降水量资料,用Z指数法划分山东伏期旱涝等级,评定伏期极端旱涝年,并与山东省全年、夏季降水的演变进行比较,发现伏期降水的阶段性特点比较明显,而干旱化趋势不明显,存在10年和2～3年的显著周期.
Based on the rainfall data in mid-summer in Shandong province, the flood and drought years are measured with Z index grads. The result are compared with that of whole year and whole summer in Shandong province. Founding characters of phasic changing are clearer , but the trend to becoming drought is weaker, And it is found that there are 2-3 years and 10 years periodic variations both in the rainfall data in mid-summe.
出处
《山东气象》
2005年第3期5-7,共3页
Journal of Shandong Meteorology
关键词
伏期
Z指数
振荡周期
mid-summer, Z index, periodic variation
