Different tropospheric precursor anomalies leading to sudden stratospheric warmings (SSWs) may result in different circulation evolution. This study finds that there are distinct differences in tropospheric circulation evolutions during SSWs following anomalously strong- (SUR-SSWs) and weak- (WUR-SSWs) Ural ridge. SUR-SSWs exhibit enhanced East Asian trough in the following week, while enhanced Greenland ridge and negative tropospheric annular mode anomalies can persist for 1 month. In contrast, WUR-SSWs exhibit surface cooling over northern Eurasia without notable tropospheric annular mode anomalies. During SUR-SSWs, waves induced by the enhanced Ural wave source tend to propagate below the tropopause, amplifying the East Asian trough. Additionally, due to decreased wave phase speed, the preexisting Ural ridge anomalies migrate westward and amplify the Greenland ridge. Before WUR-SSWs, preexisting cooling over Northeast Asia migrates westward and amplifies northern Eurasia cooling. Thus, the Ural ridge anomalies prior to SSWs significantly influence post-SSW tropospheric circulation.

导致平流层突然变暖 （SSW） 的不同对流层前体异常可能导致不同的环流演变。本研究发现，在异常强 （SUR-SSW） 和弱 （WUR-SSW） 乌拉尔脊之后的 SSW 期间，对流层环流演变存在明显差异。SUR-SSWs 在接下来的一周表现出增强的东亚槽，而增强的格陵兰脊和负对流层环形模态异常可以持续 1 个月。相比之下，WUR-SSW 在欧亚大陆北部表现出表面冷却，没有明显的对流层环形模态异常。在 SUR-SSW 期间，由增强的 Ural 波源诱导的波倾向于在对流层顶下方传播，从而放大东亚槽。此外，由于波相速度降低，先前存在的乌拉尔山脊异常向西迁移并放大了格陵兰山脊。在 WUR-SSW 之前，东北亚上空先前存在的冷却向西迁移并放大了欧亚大陆北部的冷却。因此，SSW 之前的乌拉尔脊异常显着影响 SSW 后的对流层环流。