冬季巴伦支-喀拉海冰异常的亚季节转变与北极暖-欧亚冷格局的逆转有关

IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Yijia Zhang , Zhicong Yin , Huijun Wang
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引用次数: 0

摘要

暖北极-冷欧亚格局(WACE)的亚季节逆转可能引发中国东部冬季极端冷/暖转变和春季沙尘暴。在这种显著的高纬度大气模式逆转的驱动下,巴伦支-喀拉海(BKS)也出现了海冰异常的相关亚季节转变。在温暖的北极和增强的乌拉尔高压下,BKS向下湍流热通量异常和向下红外辐射增加有利于海冰融化。海面的南风使海冰从薄冰区向常年冰区漂移,进一步扩大了开阔的海面。相反的机制发生在WACE的相反阶段,导致BKS海冰正异常。当WACE在亚季节尺度上反转时,上述机制分别发生在冬初和冬末,导致BKS海冰异常出现明显的亚季节转变。更重要的是,近10年来,随着WACE逆转频率的增加,BKS海冰初冬和冬末的亚季节转换增强。本研究结果建立了WACE亚季节逆转的综合模式,有助于更好地理解和预测中国东部极端气候。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Subseasonal transition of Barents–Kara sea-ice anomalies in winter related to the reversed warm Arctic–cold Eurasia pattern

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.

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来源期刊
Atmospheric and Oceanic Science Letters
Atmospheric and Oceanic Science Letters METEOROLOGY & ATMOSPHERIC SCIENCES-
CiteScore
4.20
自引率
8.70%
发文量
925
审稿时长
12 weeks
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