The North Pacific Gyre Oscillation and East Asian summer precipitation

The North Pacific Gyre Oscillation and East Asian summer precipitation
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北太平洋环流振荡与东亚夏季降水

DOI:
10.1002/asl.688
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发表时间:
2016-10
影响因子:
3
通讯作者:
Luo Ming
Luo Ming
中科院分区:
地球科学4区
文献类型:
--
作者:
Ye Xiaoyan;Zhang Wei;Luo Ming

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本文研究了北太平洋环流(NPGO)和东亚(EA)夏季降水(EASP)在年代际尺度上的联系。最大协方差分析表明,NPGO是调节EASP年代际变化的第三种模式。“全球变暖”和太平洋年代际涛动是最主要的两种模式。与NPGO伴生的EASP呈现自北向南的“+ − +”三极格局。对相关的大气环流也进行了分析。结果表明,NPGO和EA之间的联系涉及两个过程,即温带过程和热带过程。在温带过程中,NPGO的特征是在温带地区上空有一个向东传播的Rossby波,该波加强并使EA急流向北移动。在热带过程中,NPGO与东北太平洋的经向环流和热带海洋上的异常Walker环流有关。异常的Walker环流在热带西太平洋上表现为向下分支,在EA和西北太平洋地区表现为低层偏北风。这两个过程加强了EA夏季风环流,增强了海洋向EA北部的水汽输送,导致EA北部降水增加,中部降水减少。
This study examines the links between the North Pacific Gyre Oscillation (NPGO) and the East Asia (EA) summer precipitation (EASP) at a decadal scale. Maximum covariance analysis reveals that NPGO is the third mode regulating the decadal variation of EASP. ‘Global warming’ and Pacific Decadal Oscillation are the first two leading modes. Associated with NPGO, EASP exhibits a north‐to‐south ‘+ − +’ tripole pattern. The related atmospheric circulations are also examined. Results demonstrate that the linkage between NPGO and EA involves two processes, namely, extratropical and tropical processes. In the extratropical process, NPGO features an eastward propagating Rossby wave over the extratropical regions; this wave intensifies and displaces the EA jet stream northward. In the tropical process, NPGO is associated with a meridional circulation over the northeastern Pacific and an anomalous Walker circulation over the tropical oceans. The anomalous Walker circulation exhibits a downward branch over the western tropical Pacific and features low‐level northerly wind over EA and western North Pacific region. The two processes strengthen the EA summer monsoon circulation and enhance the moisture transportation from oceans to northern EA; thus, the precipitation in the northern EA region increases and the precipitation in the central region decreases.
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发表时间: 2016-01
期刊: --
影响因子: --
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发表时间: 2010-05-01
期刊: INTERNATIONAL JOURNAL OF CLIMATOLOGY
影响因子: --
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DOI: 10.1007/s11434-015-0824-x
发表时间: 2015-06
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影响因子: 18.9
作者:
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DOI: 10.1002/2014jc010660
发表时间: 2015-09
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作者:
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