Distinct Mid-Latitude Eurasian Rossby Wave Trains Preceding Strong and Weak Cold Surges in Southern China
Distinct Mid-Latitude Eurasian Rossby Wave Trains Preceding Strong and Weak Cold Surges in Southern China
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华南强、弱冷潮前夕的独特中纬度欧亚罗斯贝波列
DOI：
10.3389/feart.2022.861015
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发表时间：
2022-04
影响因子：
2.9
通讯作者：
Ho-Nam Cheung
中科院分区：
文献类型：
--
作者：
Juanjuan Lin;Ho-Nam Cheung
本文研究了中国南方强、弱寒潮的大尺度环流异常。结果表明，强浪涌和弱浪涌与横跨欧亚大陆、投射到斯堪的纳维亚（SCAND）和欧亚（EU）模式上的独特罗斯比波列有关。一方面，强劲的上涨之前是一个积极的SCAND模式和欧盟模式从消极到积极的过渡阶段。相应的波列从东亚向北太平洋东南方向传播。这与西伯利亚高压的强烈增强、东亚槽的加深以及华南和华北之间明显的经向压力梯度有关；这些从西伯利亚到中国南部的强冷气团。另一方面，在微弱的飙升之前，欧元区的模式是消极的，而欧盟的模式是积极的。相应的波列不会从东亚传播到北太平洋。该波列对东亚冬季季风环流的影响较弱，与中国南方的弱冷空气平流相对应。总之，欧亚大陆遥相关模式的季节内变化对于全面理解中国南方寒潮至关重要。
This study investigates the large-scale circulation anomalies of strong and weak cold surges in southern China. Results show that the strong and weak surges are associated with a distinct Rossby wave train across Eurasia projecting onto the Scandinavia (SCAND) and Eurasian (EU) patterns. On one hand, the strong surge is preceded by a positive SCAND pattern and a transition of the EU pattern from its negative to positive phase. The corresponding wave train propagates southeastward from East Asia to the North Pacific. This is associated with a strong intensification of the Siberian high, a deepened East Asian trough, and a sharp meridional pressure gradient between northern and southern China; these advect intense cold air masses from Siberia to southern China. On the other hand, the weak surge is preceded by a negative SCAND pattern and a positive EU pattern. The corresponding wave train does not propagate from East Asia to the North Pacific. This wave train has a weak impact on the East Asian winter monsoon circulation and corresponds to weak cold air advections towards southern China. Overall, the intra-seasonal variation of the Eurasian teleconnection patterns is crucial for a comprehensive understanding of the cold surge in southern China.
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