北太平洋海温年代际变化与大气环流和气候的异常

Interdecadal Variation of SST in the North Pacific and the Anomalies of Atmospheric Circulation and Climate

对应北太平洋海表温度 (SST)年代际变化的两个基本模态 ,即 2 5～ 35年模和7～ 1 0年模 ,分析研究了北半球大气环流和气候异常的形势。其结果极为清楚地表明 ,对应北太平洋SST的年代际模的正、负位相 ,大气环流和气候异常的形势都近乎相反 ,充分说明SST年代际模的重要作用 ;由于北太平洋SST的两个年代际模有十分相近的水平结构特征 ,它们对大气环流和气候的影响也有十分相似的特征 ;北太平洋海温年代际模对大气环流的影响在中高纬度地区呈正压结构特征 ,而在热带地区的响应主要有斜压结构特征。

Anomalous patterns of atmospheric circulation and climate are studied corresponding to two basic interdecadal modes of the sea surface temperature (SST) in the North Pacific, i.e., the 25～35-year mode and 7～10-year mode. The results show that corresponding to the positive / negative phase of interdecadal modes of the North Pacific SST, the anomalous patterns of the atmospheric circulation and climate in positive phase are opposite to that in negative phase, it indicates an important impact of these interdecadal modes on the atmospheric circulation and climate; since the horizontal structure of these two interdecadal modes is similar to each other, the features of their influences on the atmospheric circulation and climate are similar; the response of atmospheric circulation to interdecadal mode is barotropic structure in the mid-high latitudes, but some baraclinic structure in the tropics.