The influence of early spring sea ice at Barents Sea on midsummer rainfall in Northeast China (NEC) is identified based on observational analyses and atmospheric modeling experiments in this study. Increased sea ice area (SIA) in the Barents Sea is ensued by positive rainfall anomalies at north of NEC and by negative anomalies at south, and vice verse. Specifically, due to a good seasonal persistence from spring to summer, the preceding sea ice anomalies exert an impact on midsummer surface air temperature anomalies and vertical stability over Barents Sea via the modulation on turbulent heat flux. The anomalous circulation is further triggered over Europe and the Mediterranean Sea through meridional vertical cells, with a barotropic structure. Accordingly, an effective Rossby wave source is excited over the eastern Mediterranean by the advection of vorticity by divergence wind, and causes an eastward propagation of Silk Road Pattern to East Asia. In addition, another SIA-related wave-like train can diffuse directly southeastward from Arctic to NEC in a polar path. Observations and numerical simulations indicate that, in response to increased sea ice at Barents Sea, an anomalous cyclone emerges over NEC, along with easterly or southeasterly over north of NEC and with northwesterly over south, leading to moisture convergence anomalies at north and divergence anomalies at south. Jointly, ascending (descending) motion anomalies favors a wet (dry) summer over north (south) of NEC.

本文基于观测分析和大气模拟实验，确定了巴伦支海早春海冰对东北地区盛夏降水的影响。巴伦支海的海冰面积（SIA）的增加是由NEC北部的正降水异常和南部的负异常引起的，反之亦然。具体而言，由于春季至夏季的季节性持久性良好，先前的海冰异常通过湍流通量的调制对仲夏地表气温异常和巴伦支海的垂直稳定性产生影响。通过正压结构的子午垂直细胞进一步在欧洲和地中海上引发异常环流。因此，一个有效的罗斯比波源因发散风的涡流平流而在地中海东部被激发，并导致丝绸之路图案向东传播到东亚。此外，另一条与SIA有关的波浪状列车可以沿极地路径从北极直接向东南扩散到NEC。观测和数值模拟表明，响应巴伦支海的海冰增加，NEC上出现了异常气旋，NEC北部出现了东风或东南风，南部出现了西北风，导致北部的水汽汇聚异常，而在北端则出现了发散异常。南。总的来说，上升（下降）运动异常有利于NEC北部（南部）潮湿（干燥）的夏天。另一架与SIA相关的波浪状列车可以沿极地路径从北极直接向东南扩散到NEC。观测和数值模拟表明，响应巴伦支海的海冰增加，NEC上出现了异常气旋，NEC北部出现了东风或东南风，南部出现了西北风，导致北部的水汽汇聚异常，而在北端则出现了发散异常。南。总的来说，上升（下降）运动异常有利于NEC北部（南部）潮湿（干燥）的夏天。另一架与SIA相关的波浪状列车可以沿极地路径从北极直接向东南扩散到NEC。观测和数值模拟表明，响应巴伦支海的海冰增加，NEC上出现了异常气旋，NEC北部出现了东风或东南风，南部出现了西北风，导致北部的水汽汇聚异常，而在北端则出现了发散异常。南。总的来说，上升（下降）运动异常有利于NEC北部（南部）潮湿（干燥）的夏天。导致北部的水分收敛异常和南部的发散异常。总的来说，上升（下降）运动异常有利于NEC北部（南部）潮湿（干燥）的夏天。导致北部的水分收敛异常和南部的发散异常。总的来说，上升（下降）运动异常有利于NEC北部（南部）潮湿（干燥）的夏天。