Variation of circulation and East Asian climate associated with anomalous strength and displacement of the East Asian trough
Variation of circulation and East Asian climate associated with anomalous strength and displacement of the East Asian trough
复制标题
与东亚海槽异常强度和位移相关的环流和东亚气候变化
DOI：
10.1007/s00382-015-2504-6
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发表时间：
2015-11-01
期刊：
影响因子：
4.6
通讯作者：
Zhou, Wen
中科院分区：
文献类型：
--
作者：
Leung, Marco Yu-Ting;Zhou, Wen
研究了东亚大槽的变化及其与东亚气候的关系。研究的变化包括槽的强度和它的纬向和纬向位移。东南亚异常冷（暖）与东亚赤道高压的南（北）移是同步的。东亚热带涛动的南移可能与异常的强西伯利亚高压和阿留申低压有关，后者控制了它们之间的异常偏北风。另一方面，槽的强度和纬向位移对东北亚地区的温度有影响。EAT的这些特性与东亚北方和南方的温度密切相关。本文还讨论了EAT的变化与东亚冬季风的关系。此外，还研究了EAT与瞬态涡的关系。与EAT变化同时发生的异常瞬态涡旋是由静止涡旋和纬向对称结构变化引起的局部异常经向梯度造成的。极涡的变化对EAT强度的变化有重要意义。为了研究涡旋在EAT异常演化中的作用，我们还研究了利用波活动通量和扩展E矢量对异常EAT和纬向对称结构演化的稳态和瞬态涡旋强迫。
Variations of the East Asian trough (EAT) and its relationship with the East Asian climate are documented in this study. The variations investigated include the trough's strength and its meridional and zonal displacements. Anomalous cold (warmth) in Southeast Asia is concurrent with the southward (northward) displacement of the EAT. The southward displacement of the EAT is likely associated with an anomalous strong Siberian high and Aleutian low, which manipulate anomalous northerly wind between them. On the other hand, the temperature in northeast Asia is influenced by both the strength and the zonal displacement of the trough. These properties of the EAT are closely linked to temperatures in the northern and southern portions of East Asia. The relation between variations of the EAT and the East Asian winter monsoon is also examined. In addition, the relation between the EAT and transient eddies is studied. Anomalous transient eddies concurrent with variations of the EAT are contributed by a localized anomalous meridional gradient due to the variation of stationary eddies and zonal symmetric structure. Variations in the polar vortex are significant for variations in the strength of the EAT. To investigate the role of eddies in the anomalous evolution of the EAT, we also study stationary and transient eddy forcing on the evolution of anomalous EAT and zonal symmetric structures using wave activity flux and extended E-vectors.