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Influence of the Atlantic Multidecadal Oscillation on the Winter Climate of East China

机译:大西洋年代际涛动对华东冬季气候的影响

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摘要

大西洋 Multidecadal 摆动(AMO ) ,诺思大西洋海面温度(SST ) 的多十的变化,与 65 80 年和 0.4 ° C 的一个振幅的一个时期展出摆动。观察合成分析表明温暖的阶段 AMO 在华东被连接到更温暖的冬季,与在这个区域的北方的提高的降水和在南方的减少的降水,在多十的时间规模上。模式在冷阶段 AMO 期间被颠倒。当一强迫华东的多十的冬季气候被调查大气的反应在大气的总环流大气环流模型(AGCM ) 的一个大整体温暖 AMO SST 异例探索, AMO 是否行动,试验。从三 AGCM 的结果是一致的并且建议 AMO 温暖在华东赞成更温暖的冬季。这影响通过在从中间的纬度诺思大西洋延长到中间的纬度欧亚大陆的半球宽的领域导致否定表面气压异例被认识到。这些否定表面异例赞成高变弱蒙古的寒冷,并且因此导致更弱的东方亚洲冬季季风。
机译:The Atlantic Multidecadal Oscillation (AMO), the multidecadal variation of North Atlantic sea surface temperature (SST), exhibits an oscillation with a period of 65-80 years and an amplitude of 0.4°C. Observational composite analyses reveal that the warm phase AMO is linked to warmer winters in East China, with enhanced precipitation in the north of this region and reduced precipitation in the south, on multidecaclal time scales. The pattern is reversed during the cold phase AMO. Whether the AMO acts as a forcing of the multidecadal winter climate of East China is explored by investigating the atmospheric response to warm AMO SST anomalies in a large ensemble of atmospheric general circulation model (AGCM) experiments.The results from three AGCMs are consistent and suggest that the AMO warmth favors warmer winters in East China. This influence is realized through inducing negative surface air pressure anomalies in the hemispheric-wide domain extending from the midlatitude North Atlantic to midlatitude Eurasia. These negative surface anomalies favor the weakening of the Mongolian Cold High, and thus induce a weaker East Asian Winter Monsoon.

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