KOPRI Repository

Role of polar vortex weakening in cold events in central Asia during late winter

Cited 2 time in wos
Cited 2 time in scopus
Role of polar vortex weakening in cold events in central Asia during late winter
Other Titles
폴라보텍스 약화가 늦겨울 아시아 한파 발생에 미치는 영향
Kim, Seong-Joong
Choi, Hye-Sun
Environmental Sciences & EcologyGeology
Central AsiaLate winterCold eventsPolar vortexSiberian high
Issue Date
Kim, Seong-Joong, Choi, Hye-Sun. 2021. "Role of polar vortex weakening in cold events in central Asia during late winter". POLAR SCIENCE, 30: 1-7.
The cause of cold events over central Asia was investigated. Since 1958, surface air temperature (SAT) has gradually increased over central Asia, but SAT has shown very strong multidecadal fluctuations, with cooling dominant in the 1960s-1970s and recent decades but warming dominant in the 1990s. SAT in February in central Asia has decreased by more than 7 degrees C compared to that in normal years. Analysis indicates that cold events over central Asia are related to the weakening of the polar vortex, which is indicated by the increase in polar cap height (PCH) and weaker zonal-mean zonal winds. The increase in PCH begins in January in the stratosphere and propagates down to the troposphere in February; it is well reflected in the weakening of zonal-mean zonal winds in the stratosphere in January, which extends to the troposphere in February. The January increase in PCH anomaly is associated with surface conditions in the Arctic region, especially the Barents-Kara seas, where sea level pressure increases substantially in January; high pressure then expands to the southeastern (downstream) branch of the Siberian high in February, bringing cold eastern Siberian air to central Asia.
기타(북극 및 유라시아)
Appears in Collections  
2021-2021, Earth System Model-based Korea Polar Prediction System (KPOPS-Earth) Development and Its Application to the High-impact Weather Events originated from the Changing Arctic Ocean and Sea Ice (21-21) / Kim, Joo-Hong (PE21010)
Files in This Item

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.