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- W4380992053 abstract "Subseasonal reversal of the warm Arctic–cold Eurasia pattern (WACE) could trigger an extreme cold/warm transition in winter and sandstorms in spring over eastern China. An associated subseasonal transition of the sea-ice anomaly also occurs in the Barents–Kara seas (BKS) driven by such remarkable high-latitude atmospheric pattern reversals. Under a warm Arctic and enhanced Ural high, abnormal downward turbulent heat flux and increased downward infrared radiation in the BKS are conducive to sea ice melting. The surface southerly wind drives the sea ice to drift from the thin to perennial ice area and further enlarges the open ocean surface. The opposite mechanism occurs in the opposite phase of WACE, causing positive BKS sea-ice anomalies. When WACE reverses on the subseasonal scale, the above mechanisms occur in early and late winter, respectively, resulting in a significant subseasonal transition of BKS sea-ice anomalies. More importantly, in the last decade, with a more frequent reversal of WACE, the subseasonal transition between early winter and late winter in BKS sea ice has enhanced. The findings of this study establish a comprehensive schematic of the subseasonal reversal of WACE and contribute to better understanding and predicting extreme climate in eastern China. “暖北极-冷欧亚”模态 (WACE) 的次季节反转会触发中国东部冬季的极端冷/暖转换以及春季沙尘暴.在这一显著的高纬度大气模态反转的驱动下, 巴伦支海-喀拉海 (BKS) 的海冰异常也表现出次季节转换.当北极变暖以及乌拉尔山高压增强时, BKS异常向下的湍流热通量和增强的向下红外辐射有利于海冰融化;近地面的异常偏南风使海冰从薄冰区向多年冰区漂移, 进一步扩大了开阔洋面.相反的机制出现在WACE反位相, 导致BKS海冰异常偏多.当WACE次季节反转时, 上述机制分别发生在前冬和后冬, 使得BKS海冰异常出现显著的次季节转换.近10年随着WACE反转频率增多, BKS海冰前后冬的次季节变化增强.本文构建了WACE次季节反转的综合示意图, 有助于更好地理解和预测中国东部极端气候." @default.
- W4380992053 created "2023-06-17" @default.
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- W4380992053 date "2023-06-01" @default.
- W4380992053 modified "2023-09-27" @default.
- W4380992053 title "Subseasonal transition of Barents–Kara sea-ice anomalies in winter related to the reversed warm Arctic–cold Eurasia pattern" @default.
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- W4380992053 doi "https://doi.org/10.1016/j.aosl.2023.100392" @default.
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