- 期刊
東亞地區寒潮爆發的位渦分析
The Potential Vorticity Analysis of Cold Surge Process in East Asia
摘要
東亞地區冬季最明顯的天氣現象之一是寒潮爆發，寒潮爆發所帶來的劇烈降溫、大風、降水……等現象，往往給農漁業、交通、軍事等帶來莫大的影響。因此，針對寒潮過程做詳細的診斷分析，以了解它的環流特性是相當重要的。本文分析1988年1月21日～26日的寒潮個案，探討寒潮爆發期間大氣位渦距平結構在水平與垂直方向的發展，並應用位渦距平反求的技術，研究位渦距平引發之流場在寒潮爆發過程中所扮演的角色。高層位渦正距平的位置，主要位於高空噴流出區的左方，噴流的強弱對位渦距平的大小有明顯的關係。低層位渦正距平位於地面斜壓區之處，大致與地面氣旋的位置相同。寒潮初期上對流層存在高位渦距平，它引發的流場加強了下層的位渦距平，下層的位渦距平引發的流場，又回饋加強了上層的位渦距平，造成斜壓不穩定的過程。
並列摘要
Cold surge is a common phenomenon over eastern Asia during each winter season. Such events are generally associated with a surface anticyclone-cyclone couplet between which the southward transport of cold air occurs from a high latitude source region. The very cold air associated with these outbreaks can severely disrupt the social and economical activities in the affected regions. A cold surge case that occurred on 21-26 January 1988 was analyzed in this study. The potential vorticity anomaly field was examined. Its in fluence on the cold surge process was discussed by employing the method of potential vorticity inversion.
延伸閱讀
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