丁一汇,蒙晓. 1994. 一次东亚寒潮爆发后冷涌发展的研究[J]. 气象学报, 52(4):442-451, doi:10.11676/qxxb1994.054
一次东亚寒潮爆发后冷涌发展的研究
A CASE STUDY OF DEVELOPMENT OF A COLD SURGE AFTER OUTBREAK OF COLD WAVE IN EAST ASIA
投稿时间:1992-05-14  修订日期:1993-03-02
DOI:10.11676/qxxb1994.054
中文关键词:  个例研究  冷涌  东亚寒潮
英文关键词:Case study  Cold surge  Cold wave in East Asia
基金项目:
作者单位
丁一汇 中国气象科学研究院, 北京, 100081 
蒙晓 中国气象科学研究院, 北京, 100081 
摘要点击次数: 2091
全文下载次数: 1956
中文摘要:
      分析了1981年1月21-28日一次东亚强寒潮爆发后南海和西太平洋地区冷涌的发展过程。冷涌的发展最先表现为低层强东北风沿东亚沿海地区和南海中北部的迅速建立。2-3d之后,又在菲律宾以东洋面激起第二次冷涌。与冷涌相伴随的低层温度场变化也十分明显,同样具有先后两次降温过程。冷涌期高空风场表现有明显的脉动,南海北部高空西风迅速减弱,而在南海近赤道地区出现了很强的高空东风区。冷涌的发展与寒潮冷高压的南下有密切关系,它的强度在很大程度上取决于中纬度冷高压的强度。另一方面,冷涌发展后,通过Hadley环流可影响中纬西风急流和热带东风急流的变化。
英文摘要:
      The present paper has analysed the process of the development of a cold surge over the South China Sea and the West-pacific after an outbreak of cold air occurring during 21-28 January 1981. The initial development of the cold surge showed up in the rapid establishment of low-level strong northerly wind off the seaboard of East Asia and over the central and northern parts of the South China Sea. The duration of the cold surge is short, persistent for about 3-4 days:then the second cold surge was induced over the oceanic area to east of the Philippines, with longer duration of about 6-7 days. Accompanying the wind field of cold surge, the temperature field at low-level also showed a remarkable variation, characterized by two processes of cooling. The upper-air winds during the cold surge also indicate an obvious fluctuation. Over the northern part of the South China Sea the rapid decrease of upper-level westerly wind was observed as the cold surge developed. while over the near-equatorial region the most remarkable feature is characterized by establishment of strong upper east wind. The development of the cold surge is associated with the southward invasion of cold high. Its intensity is to a greater extent dependent on the intensity of cold high in mid-latitude. On the other hand, as the cold surge developed, it may exert an effect on the variation of mid-latitude westerly jet and tropical east jet.
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