中国气象学会气象青年科技交流会暨2022年青年科学家论坛

Northeast China (NEC) is the national grain production base, and the local precipitation is vital for agriculture during the springtime. Therefore, understanding the dynamic origins of the NEC spring rainfall (NECSR) variability is of socioeconomic importance. This study reveals an interdecadal change in the atmospheric teleconnections associated with the NECSR during recent 60 years (1961-2020). The NECSR is related to the Rossby wave train which is coupled with extratropical North Atlantic sea surface temperature (SST) before the mid-1980s, whereas it is linked to a quite different Rossby wave train that coupled with tropical North Atlantic SST after the mid-1980s. Both Rossby wave trains could lead to the enhanced NECSR through the anomalous cyclones over East Asia. The weakening of the westerly jet over around North America is mainly responsible for alternation of the atmospheric teleconnections towards NECSR during two epochs.