Decadal relationship between the North Atlantic Oscillation and cold surge frequency in Taiwan

University of Taipei > 理學院 > 應用物理暨化學學系暨碩士班 > 期刊論文 > Item 987654321/2571

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题名:	Decadal relationship between the North Atlantic Oscillation and cold surge frequency in Taiwan
作者:	Chi-Cherng Hong Huang-Hsiung Hsu Hsin-Hsing Chia Cheng-Ying Wu 許晃雄洪志誠
贡献者:	臺北市立教育大學自然科學系
日期:	2008
上传时间:	2009-07-27 13:53:59 (UTC+8)
摘要:	The close decadal relationship between the North Atlantic Oscillation (NAO) and the cold surge frequency in Northern Taiwan is identified. The cold surge frequency was higher (lower) in 1957–1977 (1981–2001), which corresponded to the negative (positive) phase of the NAO. The teleconnection pattern associated with the NAO suggests that the Siberian high, the ridge upstream of Lake Baikal and the East Asian trough, which are well-known circulation characteristics favorable for cold surge occurrences, were enhanced in the negative NAO phase. A weakened upper-level convergence over the Mediterranean-Sahara occurring in the negative NAO phase was associated with a wave-like pattern spreading toward East Asia along the subtropical jet stream. Barotropic modeling results suggest that the suppressed upper-level convergence in the Mediterranean-Sahara region may force a wave train emanating toward East Asia along the subtropical jet stream, which acts as a Rossby waveguide. The barotropic wave pattern may result in a stronger low-level northerly over subtropical East Asia and create a favorable background for the further southward penetration of cold air, and therefore more frequent cold surge occurrence. The same process may be applied to the period when the NAO is in the positive phase.
關聯:	J Geophys, p.35
显示于类别:	[應用物理暨化學學系暨碩士班] 期刊論文

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