Impact of Tropical Pacific Precipitation Anomaly on the East Asian Upper-Tropospheric Westerly Jet during the Boreal Winter
Impact of Tropical Pacific Precipitation Anomaly on the East Asian Upper-Tropospheric Westerly Jet during the Boreal Winter
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DOI：
10.1175/jcli-d-14-00674.1
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发表时间：
2015-08
影响因子：
4.9
通讯作者：
Yuanyuan Guo;Z. Wen;R. Wu;R. Lu;Zesheng Chen
中科院分区：
文献类型：
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作者：
Yuanyuan Guo;Z. Wen;R. Wu;R. Lu;Zesheng Chen
摘要 1980—2010年热带太平洋北半球冬季降水变化主导模态呈现出东西向偶极格局，一中心位于西北太平洋（WNP）和海洋大陆，另一中心位于赤道中太平洋（CP）。观测证据表明，东亚对流层上层副热带西风急流(EAJ)的变化与西北部和中部地区的降水异常具有显着的相关性，而西北部和中部地区的热带降水异常对EAJ的变化有明显的影响。进行了一系列基于线性斜压模型的数值实验，以确认与 WNP 和 CP 降水扰动相关的加热异常对 EAJ 的影响。数值实验结果表明，西太平洋核电站上空的热源可以在东亚上空对流层上层激发向北传播的罗斯贝波列，并促进向极的涡动动量……
AbstractThe leading mode of boreal winter precipitation variability over the tropical Pacific for the period 1980–2010 shows a west–east dipole pattern with one center over the western North Pacific (WNP) and Maritime Continent and the other center over the equatorial central Pacific (CP). Observational evidence shows that the variability of the East Asian upper-tropospheric subtropical westerly jet (EAJ) has a significant correlation with precipitation anomalies over the WNP and CP and that tropical precipitation anomalies over WNP and CP have a distinct influence on the variation of the EAJ. A series of numerical experiments based on a linear baroclinic model are performed to confirm the influence of the heating anomalies associated with precipitation perturbations over the WNP and CP on the EAJ. The results of numerical experiments indicate that a heat source over the WNP can excite a northward-propagating Rossby wave train in the upper troposphere over East Asia and facilitate a poleward eddy momentum...