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Cold Surges over Korean Peninsula Associated with Arctic Oscillation and the Role of Heat Source  

Shin, Sung-Chul (Department of Atmospheric Science, Kongju National University)
Kim, Maeng-Ki (Department of Atmospheric Science, Kongju National University)
Lee, Woo-Seop (Department of Atmospheric Science, Kongju National University)
Publication Information
Journal of the Korean earth science society / v.27, no.3, 2006 , pp. 302-312 More about this Journal
Abstract
This study has investigated the effect of Arctic Oscillation (AO) on cold surge through atmospheric circulation and heat source analysis for the past winters from 1979 to 2004. The number of occurrence of cold surge in the negative AO phase is about 14.3% larger than that in the positive AO phase. The number of occurrence of cold surge per a month in the negative (positive) AO phase is about 1.33 (1.05), respectively, indicating that the negative AO phase has about 26.6% larger occurrence than the positive AO phase. It means that the cold surge has occurred frequently in particular months with the negative AO phase. And it also shows that surface temperature in the negative AO phase is about $0.6^{\circ}C$ lower than in positive AO phase. As a result of the analysis for the difference of heat source according to the intensity of AO, it shows that surface air temperature around the Korean peninsula in the negative AO phase is more lower than in positive AO phase by the intensification of cold advection term. However, heat source term cancels out the cooling effect by cold advection term, indicating that it suppresses the decrease in surface air temperature. It results in a small difference of $0.6^{\circ}C$ in surface air temperature between the positive and negative AO phase in spite of the significance of atmospheric circulation change.
Keywords
cold surge; AO; heat source; atmospheric circulation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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