80 yr oscillation of summer rainfall over North China and East Asian Summer Monsoon

Physics

Scientific paper

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Global Change: Climate Dynamics (3309), Global Change: Solar Variability, Meteorology And Atmospheric Dynamics: Paleoclimatology, Meteorology And Atmospheric Dynamics: Precipitation (1854)

Scientific paper

Relationship between summer rainfall over the eastern part of China (east of 110°E) and East Asian Summer Monsoon (EASM) is studied based on summer rainfall coded levels data set for the period of 1470-1999, rain gauge data set for the period of 1951-1999 and sea level pressure (SLP) for the period of 1873-1997. The distinct 80 yr oscillation of summer rainfall is found over North China (near 35°-40°N and east of 110°E), southern part of Northeast China (south of 42°N in Northeast China), lower-middle Yangtse River valley (east of 110°E along Yangtse River) and South China (south of 25°N and east of 110°E). This oscillation over North China is in phase with that over South China and out of phase to that along lower-middle Yangtse River valley. Summer rainfall over North China correlates negatively with averaged SLP for the area near (105°-115°E and 30°-35°N), but positively with averaged SLP for the area near (120°-130°E and 20°-25°N). Therefore, an index of EASM is defined using the difference of averaged SLP over the above two regions. Summer rainfall over North China is greater than normal and drought occurs along lower-middle Yangtse River valley when strong EASM reaches North China. On the contrary, drought is found over North China and flood appears along lower-middle Yangtse River valley when EASM is close to normal or weak. Finally, the interdecadal variability of EASM is studied using long-term summer rainfall coded levels data set over North China during the past 530 yr.

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