关键词: 暴雨洪水, 气候特征, 大气环流指数, 厄尔尼诺事件, 长江中下游, 2016年洪水

Abstract: A series of concentrated heavy rainfalls in flood season caused large flood in the middle and lower reaches of Changjiang River in 2006. By analyzing climate factors influencing the rainfall in Changjiang River Basin such as El Nio event, main atmospheric circulation index and so on, we screened out the past years that had the similar influential factors in history, and analyzed their similarities and differences with that of 2016 from atmospheric circulation and precipitation. As a result, we found that the main climate factors causing concentrated heavy rainfall in the basin were as follow, the super strong EI Nio event, subtropical anticyclone characterized as stronger and west than normal years, the meridional circulation prevailed in the 500 hPa middle-high latitude, the smaller polar vortex intensity index, et al.

Key words: rainstorm and floods, climate characteristics, atmospheric circulation index, El Nio event, middle and lower reaches of Changjiang River, 2016 flood