An unprecedented marine heatwave (MHW) event occurred in the middle-high latitudes of the western North Pacific during the summer of 2022. We demonstrate that excessive precipitation thousands of kilometers away fuels this extreme MHW event in July 2022. In the upper atmosphere, a persistent atmospheric blocking system, forming over the MHW region, reduces cloud cover and increases shortwave radiation at the ocean surface, leading to high sea surface temperatures. Atmospheric perturbations induced by latent heat release from the extreme precipitation in the Indian summer monsoon region enhance this atmospheric blocking through the propagation of quasi-stationary Rossby waves. Our hypothesis is verified by using a numerical model that is forced with the observed atmospheric anomalous diabatic heating. This study sheds light on how a subtropical extreme event can fuel another extreme event at middle-high latitudes through an atmospheric teleconnection.

2022 年夏季，北太平洋西部中高纬度地区发生了一场史无前例的海洋热浪 (MHW) 事件。我们证明，数千公里外的过量降水助长了 2022 年 7 月的这一极端海洋热浪事件。在高层大气中， MHW区域上空形成的持续性大气阻挡系统减少了云量并增加了海洋表面的短波辐射，导致海洋表面温度升高。印度夏季季风区极端降水潜热释放引起的大气扰动通过准稳态罗斯贝波的传播增强了这种大气阻挡。我们的假设通过使用由观测到的大气异常非绝热加热强制的数值模型得到验证。这项研究揭示了亚热带极端事件如何通过大气遥相关引发中高纬度地区的另一场极端事件。