doi:  10.3878/j.issn.1006-9895.1612.16145
我国南方持续性低温与东亚冬季风“北弱南强”模态的关系

On the relationship between the persistent cold spell in south China and the mode with opposite signs of variation of East Asia Winter Monsoon
摘要点击 2561  全文点击 135  投稿时间:2016-03-01  修订日期:2016-10-12
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基金:  
中文关键词:  东亚冬季风  南北反相模态 南方持续性低温
英文关键词:  East  Asian Winter  Monsoon, East  Asian Winter  Monsoon mode  with opposite  signs of  variation in  the south  and in  the north, the  persistent cold  events in  South China
  
作者中文名作者英文名单位
彭京备Peng Jingbei中国科学院大气物理研究所
引用:彭京备.2017.我国南方持续性低温与东亚冬季风“北弱南强”模态的关系[J].大气科学
Citation:Peng Jingbei.2017.On the relationship between the persistent cold spell in south China and the mode with opposite signs of variation of East Asia Winter Monsoon[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      本文研究了南方持续性低温事件的环流特征,并讨论了它与冬季风南北反相模态的关系。在南方持续低温时,低温事件中,东亚大槽向北收缩。中高纬度的大型斜脊斜槽导致冷空气主要以西方路径为主,中纬度为平直气流所控制,而日本南部地区为正高度距平控制,它对冷空气东移起了阻挡作用,使得南方地区长期处于冷空气控制,造成那里的持续极端低温。同时,活跃的南支扰动也显著影响南方持续性低温的发生。
Abstract:
      In this paper, the features of atmospheric circulation for persistent cold spells in south China are investigated and their connection with a kind of East Asian Winter Monsoon mode with opposite signs of variation in the south and in the north is discussed. During the cold spells, the East Asian major trough retracts to the north. According to the location and orientation of large-scale tilted ridge and associated tilted trough at high-mid latitudes, zonal flows prevail at mid latitudes over Asia, thus leading to the so called “western path” of cold air, i. e. mainly coming zonally from the west. In addition, the southern part of Japan is dominated by positive height anomalies, which block the cold air in the west and make a prolonged control of cold air over south China, thus leading to a persistent extreme low temperature. Besides, active perturbations in the southern branch jet stream also play an indispensable role in the event.
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