Revisiting the latitude fluctuations of the eastern Pacific ITCZ during the central Pacific El Niño
Revisiting the latitude fluctuations of the eastern Pacific ITCZ during the central Pacific El Niño
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重温中太平洋厄尔尼诺期间东太平洋ITCZ的纬度波动
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Yuxing Yang
中科院分区：
文献类型：
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作者：
R. Xie;Yuxing Yang
已有研究报道，在中太平洋(CP型)厄尔尼诺的高峰期，东太平洋热带辐合区(ITCZ)向北移动。然而，本文的研究结果表明，在CP型厄尔尼诺的高峰期，东太平洋的热带辐合区(ITCZ)略有南移，而在CP型厄尔尼诺的其他季节，热带辐合区很少有异常的经向移动。与传统的EP型厄尔尼诺异常辐合的大范围南移不同，CP型厄尔尼诺期间的辐合异常在局部发展，不会延伸到EP ITCZ区以外。因此，在CP型厄尔尼诺过程中，从越赤道南下和EP降水/辐合异常中推断EP ITCZ的纬度波动是有风险的，建议同时考察海表面温度和低层风辐合的异常和总型。
Some previous studies have reported that the Intertropical Convergence Zone (ITCZ) in the eastern Pacific (EP) shifted northward during the peak phase of the central Pacific (CP‐type) El Niño. However, this study presents a new result that the EP ITCZ shifts slightly southward in the peak season and rarely has an anomalous meridional shift during other seasons of the CP‐type El Niño. Unlike the extensive southward shift of the anomalous convergence in the conventional EP‐type El Niño, the convergence anomalies during the CP‐type El Niño develop locally without extending beyond the EP ITCZ region. Therefore, it is risky to infer the latitude fluctuation of the EP ITCZ from the cross‐equator southerly and precipitation/convergence anomalies in the EP during the CP‐type El Niño. A suggestion of doing so is to examine both the anomalous and total patterns of sea surface temperature and low‐level wind convergence.