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Characteristics of Atmospheric Circulation and Heat Source related to Winter Cold Surge in Korea  

Kim Maeng-Ki (Dept. of Atmospheric Science, Kongju National University)
Shin Sung-Chul (Dept. of Atmospheric Science, Kongju National University)
Lee Woo-Seop (Dept. of Atmospheric Science, Kongju National University)
Publication Information
Journal of the Korean earth science society / v.26, no.6, 2005 , pp. 560-572 More about this Journal
Abstract
This study investigates the characteristics of atmospheric circulation and the heat source $(Q_1)$ related to the winter cold surge in Korea from 1979 to 1999. The occurrence frequency of cold surge is about one event per year and $60\%$ of the total events occurred during the former period, before 1989. During the cold surge, the pressure pattern shows more dominant east-west dipole circulation pattern in the lower troposphere and the effect of upper level trough is stronger than normal cases. Temperature falling pattern over Korea shows that the pattern opposite to the temperature structure over Lake Baikal and temperature change has opposite signs between the low-middle level and upper level, with the boundary at 400 hPa. The analysis of heat source shows that atmospheric cooling by cold advection during the cold surge is balanced by adiabatic warming due to downward motion, indicating that the movement path of cold core is associated with that of heat sink. Therefore, the movement mechanism of the heat source and sink should be well known for understanding the maintenance mechanism of cold surge and predicting cold surges.
Keywords
cold surge; upper level trough; heat source; atmospheric circulation.;
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