Abstract:

In order to analyze the characteristics of variation of beginning period of the spring rainy season in northeast area of China, reveal the main factors of affecting the beginning of period, and elaborate the mechanism between them. Based on the precipitation data of ground station and sst (sea surface temperature) data over 1959-2008 years in northeast China, the author gave the standards and promote features of the beginning period of the rainy season in northeast China, and the temporal and spatial distribution was analyzed. The results showed that the average date of the rainy season began in late May, advancing from the southeast to the northwest, and there was a significant inverse relationship with precipitation in the northeast in May; beginning period of the rainy season in northeast China had significant inter-annual change, there were quasi-2-3 years inter-annual oscillations and 32-34 years decadal cycle characteristics; mainly in the region the same type, northeast and southwest reverse type, the southeast to the northwest showed ‘-+-’ characteristics of the spatial distribution. In addition, there was a significant correlation between the beginning period of the rainy season in northeast China’s and the sst of early December to April in China’s eastern.