In this study, the mechanism for the sea ice decline over the Bering Sea and its relationship with cold events over North America are investigated based on the daily ERA-Interim data during the winter (December-February) of 1979-2016. The results show that the sea ice decline over western (eastern) Bering Sea is mainly contributed by (1) the strengthened southerly (southeasterly) wind near the surface, which possibly pushes the sea ice to move northward, and (2) the intensified downward infrared radiation (IR), which is closely related to the local increasing surface air temperature (SAT) and the intensified moisture convergence mostly induced by the anomalous southeasterly wind associated with an anticyclonic anomaly over the Alaska Bay. During the sea ice decline over the Bering Sea, a cold SAT anomaly is simultaneously found over North America. It is proved that the occurrence of such a cold event is driven by the atmospheric internal variation, but not the forcing of sea ice decline over the Bering Sea. This study deepens our understanding of sea ice decline and its relationship with contemporary cold events in winter.

中文翻译：

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白令海冬季海冰下降的可能机制及其与北美寒冷事件的关系

在这项研究中，基于1979-2016年冬季（12月至2月）的每日ERA中期数据，研究了白令海海冰下降的机理及其与北美寒冷事件的关系。结果表明，白令海西部海冰下降的主要原因是（1）地表附近的南风（东南风）增强，这可能促使海冰向北移动，（2）加剧红外辐射（IR），这与局部升高的地表气温（SAT）和加剧的水汽收敛密切相关，这主要是由阿拉斯加湾上空的反风异常引起的东南风异常引起的。在白令海海冰下降期间，北美洲同时发现了一个冷的SAT异常。事实证明，这种寒冷事件的发生是由大气内部变化驱动的，而不是白令海上海冰下降的强迫。这项研究加深了我们对海冰下降及其与冬季冬季寒冷事件的关系的了解。