Abstract
Based on the East Asian summer monsoon index and drought/flood grades during 1470–2008, the coupling relationship between them was analyzed. The results show that the East Asian summer monsoon strength index existed over seven periods. There are 1470-1573, 1574-1771, 1574-1827, 1828-1867, 1867-1828, 1895-1921 and 1922-2008. And the East Asian summer monsoon is stronger in period of 1470-1573, 1772-1827, 1827-1894 and 1922-2008. When the East Asian summer monsoon is weaker, North China and South China are prone to partial drought and yangtze-huaihe River Basin is prone to partial flood. When the East Asian summer monsoon is stronger, North China and South China are prone to partial flood and yangtze-huaihe River Basin is prone to partial drought.
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