20世纪60年代,Namias(1969)就发现北太平洋海平面气压(SLP)存在10a以上长周期的变化,这种变化与北美冬季气温异常密切相关。70年代以后,又有人(Whiteet al.,1972;Trenberth,1990;Trenberth el al.,1994)对上述变化作了进一步的验证,并指出1976年以后北太平洋的SLP异常偏低,即阿留申低压异常偏强。以阿留申低压为主要活动中心的大气年代际振荡被称为北太平洋涛动(NPDO),它与北大西洋涛动 In the 1960s, Namias (1969) found that long-term changes in the sea surface pressure (SLP) of the North Pacific over 10 years and above are closely related to the anomalous winter temperatures in North America. After the 1970s, some people (White et al., 1972; Trenberth, 1990; Trenberth el al., 1994) further verified the above changes and pointed out that the SLP in the North Pacific after 1976 is abnormally low, that is, Abnormally strong. The interdecadal oscillation of the atmosphere with the Aleutian low pressure as the main activity center is called the North Pacific Oscillation (NPDO), which is associated with the North Atlantic Oscillation