【摘要】 本文依据近五百年旱涝等级和冬季冷暖资料,在时域和频域上分析了长江下游地区的旱涝演变,并进而考察了它与淮河以南冬季冷暖的关系。结果表明:长江下游地区的旱涝变化存在2—3年、5—6年、7—14年、17—20年和27—32年的显著周期;旱涝与冷暖的变化有2—5年、7年、12年和42年等显著的共同周期,在低频变化部分,冬季冷暖变化超前于夏季旱涝变化,而在中高频部分,两者则有同位相关系。更多还原

【Abstract】 The power-spectral and maximum entropy-spectral analyses of the drought/flood data in the lower reaches of the Changjiang River have revealed the fluctuations of the cold/warmth south of the Huaihe River for the periods of 2—3, 5—6, 7—14, 17—20 and 27—32 years. It is evident by using the cross-spectral method that there is a significant correlation between the drought/flood and the cold/warmth. It is found that the evolution of the cold/warmth in winter is prior to the drought/flood in summer within the low-frequency range, but they are in phase within the middle-and high-frequency ranges.更多还原