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	Precipitation cycles in the middle and lower reaches of the Yellow River (1736-2000)
	Hao Z. X. ; Zheng J. Y. ; Ge Q. S.
	2008
关键词	wavelet analysis precipitation cycles climate forcing middle and lower reaches of the Yellow River last 300 years climate variability wavelet analysis summer rainfall qing dynasty china reconstruction archives
英文摘要	Based on the long-term precipitation series with annual time resolution in the middle and lower reaches of the Yellow River-and its four sub-regions during 1736-2000 reconstructed from the rainfall and snowfall archives of the Qing Dynasty, the precipitation cycles are analyzed by wavelet analysis and the possible climate forcings, which drive the precipitation changes, are explored. The results show that: the precipitation in the middle and lower reaches of the Yellow River has inter-annual and inter-decadal oscillations like 2-4a, quasi-22a and 70-80a. The 2-4a cycle is linked with El Nino events, and the precipitation is lower than normal year in the occurrence of the El Niho year or the next year; for the quasi-22a and the 70-80a cycles, Wolf Sun Spot Numbers and Pacific Decadal Oscillation (PDO) coincide with the two cycle signals. However, on a 70-80a time scale, the coincidence between solar activity and precipitation is identified before 1830, and strong (weak) solar activity is generally correlated to the dry (wet) periods; after 1830, the solar activity changes to 80-100a quasi-century long oscillation, and the adjusting action to the precipitation is becoming weaker and weaker; the coincidence between PDO and precipitation is shown in the whole time series. Moreover, in recent 100 years, PDO is becoming a pace-maker of the precipitation on the 70-80a time scale.
出处	Journal of Geographical Sciences
卷	18
期	1
页	17-25
收录类别	SCI
语种	英语
ISSN号	1009-637X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23890]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Hao Z. X.,Zheng J. Y.,Ge Q. S.. Precipitation cycles in the middle and lower reaches of the Yellow River (1736-2000). 2008.

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