Anomalies Of The Northeast China Floods Season Precipitation And The Relations With SSTA

Based on the analysis of the Northeast China precipitation character, this paper is particularly concerned with the corresponding general circulation anomalies character of Anomalies of the Northeast China floods season Precipitation and the influence of SSTA in southwest India Ocean and in North Atlantic on rainfall in floods season in Northeast China. The main conclusions are followed:(1) The rainy season in Northeast China is from June to September, and the main Precipitation befallen in floods season (July and august). Precipitation anomalies take place most easily in floods season.(2) In the recent fifty years, precipitation in all seasons and the floods season shows a decrease tendency except that spring precipitation shows a light increase tendency. Northeast China floods season Precipitation take place a mutation in 1967.The distribution of Northeast China floods season Precipitation anomalies shows different phase in different years.(3) Northeast China Precipitation anomalies shows complex periodic variation in different seasons and in different years, but all the season exist periodic variation of quasi-three years and over 10 years to different extent.(4) There exist close relation between the floods season precipitation in Northeast China and the anomalies of subtropical summer monsoon , the anomalies of cold air, Sub-tropical anticyclone, polar front jet, North hemisphere general circulation anomalies in winter.(5) There is a apparent negative correlation between floods season precipitation in Northeast China and SSTA(6-7 monthly averaged in former year)in Southwest India Ocean, especially the higher correlation in the "Key regions"(-23°S-13°S , 57°E-77°E).The northeast and the southwest of Northeast China and the "Key regions" are significant regions in couple.(6) There is apparent positive correlation between floods season precipitation in Northeast China and SSTA(3-5 monthly averaged in present year)in the "Key regions" (21°N-27°N, 61°W-75°W) of North Atlantic. The "seesaw" type of SSTA distribution is the dominate SSTA distribution in North Atlantic correlating with the floods season precipitation anomalies in Northeast China.