Acta Geographica Sinica ›› 2016, Vol. 71 ›› Issue (5): 707-717.doi: 10.11821/dlxb201605001

• Climate Change •     Next Articles

Spatial patterns of drought/flood over eastern China in the periods of anomalous solar activity during the past millennium

Quansheng GE1(), Lulu LIU1,2, Jingyun ZHENG1, Zhixin HAO1()   

  1. 1. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-01-25 Revised:2016-02-20 Online:2016-05-25 Published:2016-05-25
  • Supported by:
    Key Program of National Natural Science Foundation of China, No.41430528;The Strategic Priority Research Program of the Chinese Academy of Sciences, No.XDA05080100;Basic Research Project of the Ministry of Science and Technology, No.2011FY120300

Abstract:

Based on five new reconstructions of solar irradiance, the anomalous solar activity periods during the past millennium, including 5 Solar Minimum periods, 2 Solar Maximum, and 4 high solar irradiance periods, were identified. Furthermore, the spatial patterns of drought/flood over eastern China for these 11 periods were reconstructed using an index of difference between drought and flood frequency derived from a 63-site yearly drought/flood grade dataset. It was found that there are different drought/flood patterns over eastern China within 11 solar activity anomalies. Spatial patterns showed alternative distribution of drought and flood among 5 Solar Minimum (1010-1050, 1280-1350, 1460-1550, 1645-1715, 1795-1823), with a higher probability of drought (flood) dominating the middle and lower reaches of the Yangtze River (North China). In the periods of solar maximum and high solar irradiance, drought prevailed over eastern China in Medieval Maximum (1100-1250), while flood prevailed over eastern China in 1845-1873. The remaining four periods (1351-1387, 1593-1612, 1756-1787, 1920-2000) presented a pattern of alternate drought and flood. The ensemble mean patterns of drought/flood for all the 5 Solar Minimum presented a zonal distribution with flood in South China, drought in the middle and lower Yangtze River and flood in most parts of North China, whereas the reverse distribution, drought in South China, flood in the middle and lower Yangtze River and drought in most parts of North China, were shown in the ensemble mean patterns of drought/flood for all the 6 periods with solar maximum and high solar irradiance.

Key words: Solar Minimum, Solar Maximum, spatial patterns of drought/flood, eastern China, past millennium