中国干旱的22年周期与太阳磁活动周

本文根据《中国近五百年旱涝分布图集》的资料，通过谱分析和时序迭加分析发现:（1）全国普遍存在着22年左右的干旱周期，在30°—40°N 、105°E以东的长江和黄河流域之间表现得较为稳定。(2)太阳磁活动周对22年干旱周期影响很明显，其位相因地有所不同，一般在双周高值年后6—10年出现干旱极大值。（3）五十年一遇的特大干旱，绝大多数出现在双周高值年前后3—4年。

Evidence of a 22-year Cycle of Drought in China Related to the Hale Solar Cycle

In this paper, by using spectral analysis and superposed-epoch analysis based on the data of “Yearly Charts of Dryness/Wetness in China for the Last 500 Years Period”, the evidence of 22-year cycle of drought in China related to the Hale solar cycle is studied and some facts are found as follows: ① The 22-year cycle of drought generally exists in the region to the east of 105oE in China, particularly in the regions between the Yangtze River and the Yellow River. ② The 22-year cycle of drought is closely related to the sunspot magnetic cycle and their phase angle varies from place to place. Drought usually reaches a maximum about 6—10 years after the peak year of the even numbered sunspot cycle. ③ The most severe drought in a 50-year cycle occurs about 3—4 years before or after the peak year of the even numbered sunspot cycle