While the observed decline of sea ice over the Chukchi‐Bering Sea (CBS) has coincided with the “warm‐Arctic, cold‐continent” (WACC) pattern over the North America (NA) sector, there is a debate on the causes of theWACC pattern. Here we present a very similarWACC pattern over the NA sector on both interannual and subseasonal time scales. Lead‐lag regression analyses on the shorter time scale indicate that an anomalous anticyclonic circulation over Alaska/Yukon in conjunction with the downward surface turbulent heat flux and long‐wave radiation anomalies over CBS leads the formation of the WACC pattern by about 1–2 days, while the latter further leads CBS sea ice reduction by about 3 days. These results indicate that atmospheric variability may play an active role in driving both the WACC pattern over NA and CBS sea ice variability.

中文翻译：

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大气变率在推动北美地区“暖-北极、冷-大陆”格局和楚科奇-白令海海冰变率中的作用

虽然观察到的楚科奇-白令海 (CBS) 海冰的减少与北美 (NA) 地区的“暖-北极、冷-大陆”(WACC) 模式相吻合，但关于造成这一现象的原因仍存在争论。 WACC 模式。在这里，我们在年际和次季节时间尺度上展示了北美地区非常相似的 WACC 模式。较短时间尺度的超前-滞后回归分析表明，阿拉斯加/育空地区的异常反气旋环流连同 CBS 上空的向下表面湍流热通量和长波辐射异常导致 WACC 模式形成约 1-2 天，而后者进一步领先 CBS 海冰减少约 3 天。这些结果表明，大气变化可能在驱动北美和 CBS 海冰变化的 WACC 模式方面发挥积极作用。