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Surface and Upper-Level Features Associated with Wintertime Cold Surge Outbreaks in South Korea
作者姓名:Sang-Boom RYOO  Won-Tae KWON  Jong-Ghap JHUN
作者单位:Meteorological Research Institute Korea Meteorological Administration,Seoul 156-720,Meteorological Research Institute Korea Meteorological Administration,Seoul 156-720,School of Earth and Environment Sciences Seoul National University,Seoul 156-720
摘    要:The surface and upper-level features associated with a sharp drop of wintertime daily temperature over South Korea is investigated in this study. This sharp drop in daily temperature is called a cold surge and is one of the most hazardous weather phenomena in East Asian winters. An upper-level baroclinic wave of 60°wavelength propagating eastward at a phase speed of 12°longitude per day across the continent of northern China from the west of Lake Baikal toward the eastern coast of China causes the outbreak of cold air over South Korea. The cooling associated with the upper-level baroclinic wave is found at all altitudes under the geopotential height-fall center near the tropopause. The development in the ridge seems to derive the early evolution of the eastward-propagating sinusoidal wave, whereas the trough is connected directly with the tropospheric temperature-drop. An enhancement of the wintertime East Asian jet stream after the outbreak of a cold surge is a response to the steep temperature gradient associated with the developing baroclinic wave.

关 键 词:韩国  冬季  温度  斜压  大气动力学

Surface and upper-level features associated with wintertime cold surge outbreaks in South Korea
Sang-Boom RYOO,Won-Tae KWON,Jong-Ghap JHUN.Surface and Upper-Level Features Associated with Wintertime Cold Surge Outbreaks in South Korea[J].Advances in Atmospheric Sciences,2005,22(4):509-524.
Authors:Sang-Boom Ryoo  Won-Tae Kwon  Jong-Ghap Jhun
Affiliation:Meteorological Research Institute, Korea Meteorological Administration, Seoul 156-720,Meteorological Research Institute, Korea Meteorological Administration, Seoul 156-720,School of Earth and Environment Sciences, Seoul National University, Seoul 156-720
Abstract:The surface and upper-level features associated with a sharp drop of wintertime daily temperature over South Korea is investigated in this study. This sharp drop in daily temperature is called a cold surge and is one of the most hazardous weather phenomena in East Asian winters. An upper-level baroclinic wave of 60° wavelength propagating eastward at a phase speed of 12° longitude per day across the continent of northern China from the west of Lake Baikal toward the eastern coast of China causes the outbreak of cold air over South Korea. The cooling associated with the upper-level baroclinic wave is found at all altitudes under the geopotential height-fall center near the tropopause. The development in the ridge seems to derive the early evolution of the eastward-propagating sinusoidal wave, whereas the trough is connected directly with the tropospheric temperature-drop. An enhancement of the wintertime East Asian jet stream after the outbreak of a cold surge is a response to the steep temperature gradient associated with the developing baroclinic wave.
Keywords:cold surge  South Korea  baroclinic wave  East Asian jet stream
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