| Characteristics of Atmospheric Circulation Associated with Cold Surge Occurrences in East Asia： A Case Study During 2005/06 Winter |
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| 作者姓名： | Tae-Won PARK Jee-Hoon JEONG Chang-Hoi HO Seong-Joong KIM |
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| 作者单位： | School of Earth and Environmental Sciences，Seoul National University，Seoul，Korea，Department of Earth Sciences，University of Gothenburg，Gothenburg，Sweden，Korea Polar Research Institute，Incheon，Korea |
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| 基金项目： | Korea Meteorological Administration Research and Development Program，BK21 Project of the Korean government，Jee-Hoon Jeong's contribution is the contribution No.16 from TELLUS，Centre of Earth System Science at University of Gothenburg |
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| 摘 要： | The characteristics of the upper-level circulation and thermodynamical properties for the period when two distinct cold surges broke out over East Asia during the 2005/06 winter are investigated. From early December 2005 to early January 2006, exceptionally cold weather lasted for approximately one month due to two successive cold surges that took place on 2 December 2005 and 2 January 2006, respectively. This study reveals that both involve the upper-tropospheric circulation, which induces the amplification and expansion of the surface Siberian high toward East Asia, but arose from different causes： the former is caused by the upper-level blocking originated from the North Pacific and the latter is caused by the upper-level wave train across the Eurasian Continent. In particular, it is suggested that the lower-tropospheric anomalous wind caused by upper-level circulation anomalies and a steep meridional temperature gradient amplified by phase-locked annual cycle combined to induce very strong cold advection in East Asia, which resulted in exceptionally cold weather that lasted for several weeks. The present results emphasize that the characteristics of the upper-tropospheric circulation can be considered as important precursors to cold surge occurrences in East Asia.
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| 关 键 词： | 东亚 冬季季风 对流层环流 大气 |
Characteristics of atmospheric circulation associated with cold surge occurrences in East Asia: A case study during 2005/06 winter |
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| Tae-Won PARK,Jee-Hoon JEONG,Chang-Hoi HO,Seong-Joong KIM.Characteristics of atmospheric circulation associated with cold surge occurrences in East Asia: A case study during 2005/06 winter[J].Advances in Atmospheric Sciences,2008,25(5):791-804. |
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| Authors: | Tae-Won Park Jee-Hoon Jeong Chang-Hoi Ho Seong-Joong Kim |
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| Institution: | [1]School of Earth and Environmental Sciences, Seoul National University, Seoul, Korea [2]Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden [3]Korea Polar Research Institute, Incheon, Korea |
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| Abstract: | The characteristics of the upper-1evel circulation and thermodynamical properties for the period when two distinct cold surges broke out over East Asia during the 2005/06 winter are investigated.From early December 2005 to early January 2006,exceptionally cold weather lasted for approximately one month due to two successive cold surges that took place on 2 December 2005 and 2 January 2006,respectively.This study reveals that both involve the upper-tropospheric circulation,which induces the amplification and expansion of the surface Siberian high toward East Asia.but arose from difierent causes:the former is caused by the upper-level blocking originated from the North Pacific and the latter is caused by the upper-level wave train across the Eurasian Continent.In particular,it is suggested that the lower-tropospheric anomalous wind caused by upper-level circulation anomalies and a steep meridional temperature gradient amplified by phase-locked annual cycle combined to induce very strong cold advection in East Asia.which resulted in exceptionally cold weather that lasted for several weeks.The present results emphasize that the characteristics of the upper-tropospheric circulation can be considered as important precursors to cold surge occurrences in East Asia. |
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| Keywords: | cold surge Siberian high East Asia East Asian winter monsoon upper-tropospheric circula-tion |
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