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高原气象  2015 

NAO对青藏高原中东部夏季降水双极振荡模态影响的时间尺度厘定

DOI: 10.7522/j.issn.1000-0534.2015.00031, PP. 633-641

Keywords: 青藏高原,夏季降水,集合经验模态分解,北大西洋涛动

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Abstract:

通过对1961-2010年青藏高原中东部66个台站夏季降水的EOF分析,进一步证实在现代气候背景下南北双极振荡模态是夏季青藏高原最主要的降水空间结构,并表现出较强的稳定性,相关分析表明该模态与夏季北大西洋涛动(NAO)存在稳定密切的联系.集合经验模态分解(EEMD)能够根据NAO和青藏高原降水双极振荡模态时间系数序列自身的特点而把原序列中不同时间尺度的信息分离出来,夏季NAO与青藏高原降水双极振荡模态之间最显著的联系主要发生在以准3~4年为周期的年际信号里,因此,以NAO为主的北大西洋大气活动(而非该地区的海温变化)可能是驱动青藏高原夏季降水南北双极振荡模态形成的最主要原因之一.

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