Rossby waves propagating along the Asian jet frequently cause the breaking near the jet exit region. This study examines characteristics of oceanographic condition and atmospheric circulation associated with interdecadal variability of Rossby wave breaking frequency near Japan in August. Sea surface temperature during a period of the higher Rossby wave breaking frequency is cooler over the central part of the tropical North Pacific, compared with that during a period of the lower frequency. Convective activities are suppressed over the region consistent with the cooler sea surface temperature, contributing to an enhanced and southwestward extended mid-Pacific trough. Deceleration and diffluence of the Asian jet are stronger during the period of the higher frequency than that during the period of the lower one. The enhanced deceleration and diffluence of the jet are associated with the enhanced and southwestward extended mid-Pacific trough. The abovementioned dynamical influence is also shown by a numerical simulation using an atmospheric linear baroclinic model. These results indicate that the interdecadal variability of sea surface temperature over the central part of the tropical North Pacific has an impact on that of the Rossby wave breaking frequency near Japan, through the modulated convective activities and mid-Pacific trough.

沿着亚洲喷气机传播的罗斯比波经常引起喷气机出口区域附近的破裂。这项研究调查了八月份日本附近的海洋条件和大气环流特征与罗斯比破波频率的年代际变化有关。与较低频率时期相比，较高的Rossby破波频率期间海表温度在热带北太平洋中部较凉爽。在与海表温度较低相一致的区域内，对流活动受到抑制，导致太平洋中部海槽增加并向西南延伸。在频率较高的时期，亚洲喷气机的减速和扩散要强于频率较低的时期。喷流的减速度和扩散性增强与太平洋中部海槽的增强和向西南延伸有关。上述动力学影响还通过使用大气线性斜压模型的数值模拟显示。这些结果表明，热带北太平洋中部海表温度的年代际变化通过调节对流活动和太平洋中部海槽，对日本附近的罗斯比海浪破壁频率产生了影响。