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Data Analysis of Recent Warming Pattern in the Arctic

机译：北极最近变暖模式的数据分析

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References(17) Cited-By(4) Supplementary materials(1) In this study, we investigate the mechanism of the arctic warming pattern in surface air temperature (SAT) and sea ice concentrations over the last two decades in comparison with global warming since the 1970s.According to the analysis result, it is found that the patterns of SAT and sea ice before 1989 are mostly determined by the Arctic Oscillation (AO) in winter. In contrast, arctic warming patterns after 1989 are characterized by the intensification of the Beaufort High and the reduced sea-ice concentrations in summer induced by the positive ice-albedo feedback.It is concluded that the arctic warming before 1989 especially in winter was explained by the positive trend of the AOI. Moreover the intensified Beaufort High and the drastic decrease of the sea ice concentrations in September after 1989 were associated with the recent negative trend of the AOI. Since the decadal variation of the AO is recognized as the natural variability of the global atmosphere, it is shown that both of decadal variabilities before and after 1989 in the Arctic can be mostly explained by the natural variability of the AO not by the external response due to the human activity.
机译：参考文献（17）被引用的文献（4）补充材料（1）在本研究中，我们调查了过去二十年来与全球变暖相比，北极变暖模式在地表温度（SAT）和海冰浓度方面的机制。根据分析结果，发现1989年以前SAT和海冰的模式主要由冬季的北极涛动（AO）决定。相比之下，1989年以后北极变暖的特征是波弗特高压加剧，夏季由于冰-反照率反馈引起的海冰浓度降低。结论是1989年以前特别是冬季的北极变暖是由AOI的积极趋势。此外，1989年之后的9月，波弗特高强度的增强和海冰浓度的急剧下降与AOI的近期消极趋势有关。由于AO的年代际变化被认为是全球大气的自然变化，因此表明1989年之前和之后的北极年代际变化都可以用AO的自然变化来解释，而不是由外部响应引起。对人类的活动。

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