Journal of Geographical Sciences ›› 2005, Vol. 15 ›› Issue (3): 286-292.doi: 10.1360/gs050303

• Climate and Environmental Change • Previous Articles     Next Articles

Dryness-wetness change and regional differentiation of flood-drought disasters in Guangdong during 1480-1940AD

ZHONG Wei, XUE Jibin, PENG Xiaoying, ZHAO Yinjuan   

  1. College of Geographical Science, South China Normal University, Guangzhou 510631, China
  • Received:2005-03-07 Revised:2005-04-25 Online:2005-09-25 Published:2005-09-25
  • Supported by:

    Natural Science Foundation of Guangdong Province, No.031522; Fok Ying Tung Education Foundation, No.91021

Abstract:

Based on the historical records of the drought and flood disasters during 1480-1940AD, this paper reconstructs the sequences of wetness index (WI) and drought and flood disasters. We find a good identical relationship between the fluctuation of WI sequence and the δ18O record of the GISP2 ice core in Greenland, which shows an apparent monsoonal disposal pattern of moisture and temperature. By applying the Morlet Wavelet Transform Method to deal with the data, several apparent periodicities, such as 7-8a, 11-15a, 20-23a and ca 50a, are revealed, among which some can be attributed to the solar forcing. Based on results of Cluster Analysis of dry-wet changes, we resume the regional differentiation pattern of flood-drought disasters all over Guangdong during different climatic intervals in the LIA and, find the western and northern parts of Guangdong have undergone drastic changes in drought-flood regional differentiation, but the eastern part is relatively stable, and the area of the Pearl River Delta shows stable condition of more flood disasters.

Key words: Guangdong, climatic change, drought and flood disaster, regional differentiation, the LIA