We examined dissimilar characteristics associated with the North Pacific mean sea surface temperature (SST) regime shifts across 1976/1977 and 1998/1999. The SST spatial pattern across 1976/1977 was more similar to that of a Pacific Decadal Oscillation compared with that across 1998/1999. Across the 1976/1977 regime shift, the wind stress curl forcing before 1976/1977 was not balanced with meridional oceanic currents after 1976/1977, indicating that the oceanic dynamic adjustment due to basin-scale anomalous wind forcing in the North Pacific played a minor role in the 1976/1977 climate regime shift. However, the atmospheric forcing significantly contributed to the SST condition after the 1976/1977 regime shift. On the other hand, both oceanic dynamic adjustment and atmospheric wind forcing played key roles in the 1998/1999 North Pacific regime shift. We infer that the leading mechanisms associated with the North Pacific SST regime shift depend on the change of mean SST over the tropical Pacific.

我们研究了1976/1977年和1998/1999年与北太平洋平均海表温度（SST）体制变化相关的不同特征。1976/1977年的SST空间格局与1998/1999年的太平洋年代际涛动更为相似。在整个1976/1977年政权转移中，1976/1977年之前的风应力卷曲强迫与1976/1977年之后的子午洋流不平衡，这表明北太平洋海盆尺度异常风强迫引起的海洋动力调节作用较小。在1976/1977年气候变化中的作用。但是，在1976/1977年政权转移后，大气强迫极大地促进了SST条件。另一方面，。我们推断，与北太平洋SST体制转变有关的主导机制取决于热带太平洋上平均SST的变化。