In the current climate, a better understanding of the factors that cause variability in Indian summer monsoon rainfall over northeast India is critical because it is susceptible to climate change. The variability and remote teleconnections keep altering owing to this change in climate reign. Therefore, the variability and teleconnections should be studied with recent datasets. In the present study, the northeast India summer monsoon rainfall is elucidated, showing the vital role of Atlantic Nino during the recent four decades. The Atlantic Nino intensifies the intertropical convergence zone (ITCZ) across Atlantic and West Africa. Consequently creates a widespread upper-tropospheric divergence, inciting successive positive-negative geopotential height anomalies. These changes in upper-tropospheric geopotential height and mid-latitude wave originating from North Atlantic following the path passing over northeast India, creating a similar pattern as Pacific-North America Pattern manifests the linkage between Atlantic Nino and northeast India summer monsoon rainfall by increasing the upper-tropospheric positive geopotential height anomaly over there. A Pacific-Japan type pattern is also associated with the positive phase of Atlantic Nino, which restricts the cross-equatorial flow from transporting moisture towards the South China Sea and enhancing the moisture transport towards northeast India. And this triggers the convection process, thereby strengthening the monsoonal rainfall over there. These results are also confirmed by using the CFSv2 model sensitivity experiment and a case study of the year 2017.

在当前气候下，更好地了解导致印度东北部夏季风降雨量变化的因素至关重要，因为它容易受到气候变化的影响。由于气候统治的这种变化，可变性和远程遥相关不断变化。因此，应使用最近的数据集研究变异性和遥相关性。在本研究中，阐明了印度东北部夏季季风降雨，显示了大西洋尼诺在最近四年中的重要作用。大西洋尼诺现象加剧了横跨大西洋和西非的热带辐合带（ITCZ）。结果造成了广泛的对流层上层发散，引发了连续的正负位势高度异常。对流层上层位势高度和源自北大西洋的中纬度波的这些变化沿着经过印度东北部的路径，形成了与太平洋-北美模式类似的模式，通过增加大西洋尼诺和印度东北部夏季风降雨量之间的联系，那里的对流层上层正位势高度异常。太平洋-日本型模式也与大西洋尼诺的正相位有关，这限制了跨赤道流向南海输送水分和增强向印度东北部的水分输送。这触发了对流过程，从而加强了那里的季风降雨。这些结果也通过使用 CFSv2 模型敏感性实验和 2017 年的案例研究得到证实。