Atmospheric blocking is a crucial driver of extreme weather events, but its climatological frequency is largely underestimated in state-of-the-art climate models, especially around the North Atlantic. While air-sea interaction along the North Atlantic oceanic frontal region is known to influence Atlantic blocking activity, remote effects from the Pacific have been less studied. Here we use semi-idealised experiments with an atmospheric general circulation model to demonstrate that the mid-latitude Pacific oceanic front is crucial for climatological Atlantic blocking activity. The front intensifies the Pacific eddy-driven jet that extends eastward towards the North Atlantic. The eastward-extended Pacific jet reinforces the North Atlantic circulation response to the Atlantic oceanic front, including the storm track activity and the eddy-driven jet. The strengthening of the eddy-driven jet reduces the Greenland blocking frequency. Moreover, the Pacific oceanic front greatly strengthens the stationary planetary-scale ridge in Europe. Together with a stronger northeastward extension of the Atlantic storm track, enhanced interaction between extratropical cyclones and the European ridge favours the occurrence of Euro-Atlantic blocking. Therefore, the North Atlantic circulation response amplified remotely by the Pacific oceanic front substantially increases Euro-Atlantic blocking frequency while decreasing Greenland blocking frequency.

大气阻塞是极端天气事件的关键驱动因素，但在最先进的气候模型中，其气候频率在很大程度上被低估了，尤其是在北大西洋周围。虽然已知沿北大西洋海洋锋区的海气相互作用会影响大西洋阻塞活动，但对太平洋的远程影响研究较少。在这里，我们使用大气环流模型的半理想化实验来证明中纬度太平洋海洋锋对气候大西洋阻塞活动至关重要。锋面加强了向东延伸至北大西洋的太平洋涡流驱动的急流。向东延伸的太平洋急流加强了北大西洋环流对大西洋锋面的响应，包括风暴路径活动和涡流驱动的急流。涡流驱动射流的加强降低了格陵兰阻塞频率。此外，太平洋前缘极大地加强了欧洲静止的行星尺度脊。加上大西洋风暴路径向东北方向的延伸增强，温带气旋与欧洲洋脊之间相互作用的增强有利于欧洲-大西洋阻塞的发生。因此，太平洋前缘远程放大的北大西洋环流响应大大增加了欧洲-大西洋阻塞频率，同时降低了格陵兰阻塞频率。温带气旋与欧洲洋脊相互作用增强，有利于欧洲-大西洋阻塞的发生。因此，太平洋前缘远程放大的北大西洋环流响应大大增加了欧洲-大西洋阻塞频率，同时降低了格陵兰阻塞频率。温带气旋与欧洲洋脊相互作用增强，有利于欧洲-大西洋阻塞的发生。因此，太平洋前缘远程放大的北大西洋环流响应大大增加了欧洲-大西洋阻塞频率，同时降低了格陵兰阻塞频率。