The principal modes of variability of the boreal winter Hadley cell
The principal modes of variability of the boreal winter Hadley cell
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DOI：
10.1029/2007gl031883
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发表时间：
2008-01
影响因子：
5.2
通讯作者：
Jie Ma;Jianping Li
中科院分区：
文献类型：
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作者：
Jie Ma;Jianping Li
平均纬向环流（MMC）的北半球冬季物质流函数的年际变率主要由赤道非对称模态和对称模态控制。前（后）模态主要在年代际（年际）时间尺度上与北方Hadley环流联系在一起。非对称模态指数（AMI）反映了这种模态的强度，在世纪的最后几十年中，AMI呈现出明显的上升趋势。热带印度洋-西太平洋暖池的海温增暖可能是导致非对称模态增强的重要因素，热带大西洋南部和东南太平洋海温增暖也可能是导致非对称模态增强的重要因素。对称模态指数（SMI）显示出显著的年际变化，与ENSO有非常稳健和一致的相关性，这意味着Hadley环流的变化主要与ENSO在年际时间尺度上相关。此外，对称模态变率也与热带印度西太平洋暖池的SST有关。
The year‐to‐year variability of the boreal winter mass stream function of the mean meridional circulation (MMC) is dominated by an equatorially asymmetric mode and a symmetric mode. The former (latter) mode is linked with the boreal Hadley cell mainly on the decadal (interannual) time‐scale. The asymmetric mode index (AMI), which indicates the strength of this mode, shows a clear upward trend during the last decades of the 20th century. The strong sea surface temperature (SST) warming in the tropical Indo‐west Pacific warm‐pool might be an important factor contributing to the intensification of the asymmetric mode, and the SST warming in the southern tropical Atlantic Ocean and southeast Pacific may also contribute to this intensification. The symmetric mode index (SMI) shows a significant interannual variability that has a very robust and consistent correlation with ENSO, implying that the variability of the Hadley cell is mainly associated with ENSO on the interannual time‐scale. Additionally, the symmetric mode variability is also connected with the SST in the tropical Indo‐west Pacific warm‐pool.