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An Analysis of Decade - to - Century - scale Climatic Jumps in History

Yan Zhongwei and Wang Xiaochun(Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100081)Li Zhaoyuan(Institute of Meteorological Sciences of Shaanxi Province, Xian 710015)  
The flood/drought grade series of last 2000 years were reconstructed based on historical documents for Haihe and Xian regions in North China. The decade- and century - scale climaticjumps in the series were analyzed and large-scale jumps were recognized by comparing the different regional changes.It was noted by case study that North China might be a sensitive areaof climatic jump which related to East Asian Monsoon system. The paper discusses the frequency of jumps and the rate of the change during a jump.
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