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首页> 外文期刊>Advances in Atmospheric Sciences >Temporal Structures of the North Atlantic Oscillation and Its Impact on the Regional Climate Variability
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Temporal Structures of the North Atlantic Oscillation and Its Impact on the Regional Climate Variability

机译：北大西洋涛动的时间结构及其对区域气候变化的影响

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摘要

In this study, the temporal structure of the variation of North Atlantic Oscillation (NAO) and its impact on regional climate variability are analyzed using various datasets. The results show that blocking formations in the Atlantic region are sensitive to the phase of the NAO. Sixty-seven percent more winter blocking days are observed during the negative phase compared to the positive phase of the NAO. The average length of blocking during the negative phase is about 11 days, which is nearly twice as long as the 6-day length observed during the positive phase of the NAO. The NAO-related differences in blocking frequency and persistence are associated with changes in the distribution of the surface air temperature anomaly, which, to a large extent, is determined by the phase of the NAO. The distribution of regional cloud amount is also sensitive to the phase of the NAO. For the negative phase, the cloud amounts are significant, positive anomalies in the convective zone in the Tropics and much less cloudiness in the mid latitudes. But for the positive phase of the NAO, the cloud amount is much higher in the mid-latitude storm track region. In the whole Atlantic region, the cloud amount shows a decrease with the increase of surface air temperature. These results suggest that there may be a negative feedback between the cloud amount and the surface air temperature in the Atlantic region.
机译：在这项研究中，使用各种数据集分析了北大西洋涛动（NAO）变化的时间结构及其对区域气候变化的影响。结果表明，大西洋地区的阻塞地层对NAO的相位很敏感。与NAO的积极阶段相比，在负阶段观察到的冬季阻滞天数增加了67％。负面阶段的平均封锁时间约为11天，几乎是NAO正面阶段的6天封锁时间的两倍。与NAO有关的阻塞频率和持久性差异与地表气温异常分布的变化有关，这在很大程度上取决于NAO的相位。区域云量的分布也对NAO的相位敏感。对于负值阶段，热带地区对流区的云量很大，正异常，中纬度地区的云量少得多。但是对于NAO的积极阶段，中纬度风暴道区域的云量要高得多。在整个大西洋地区，云量随地面气温的升高而减少。这些结果表明，在大西洋地区，云量与地面气温之间可能存在负反馈。

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