세미나 연사 
박태원 교수님(전남대학교 지구과학교육과)
 세미나 장소 
과학관 553
 연도 
2017
 월 / 일 
12/5
 시간 
16:00

Title : Characteristics of Cold Surges over East Asia and Its Relation to Arctic Oscillation   


Abstract:

 The present study reveals the changes in the characteristics of cold surges over East Asia for boreal winter (November to March) in terms of frequency, duration, and atmospheric circulation pattern. Through a hierarchical clustering method, cold surges over East Asia are classified into two distinct types. One is the wave-train type that is associated with developing large-scale waves across the Eurasian continent. The other is the blocking type whose occurrence accompanies subarctic blocking. The blocking cold surge tends to be more intense, last longer, and be more predictable compared to the wave-train type. To resolve the weakness of the clustering method, two dynamic indices are proposed to objectively identify cold surge types using potential temperature (θ) on the dynamic tropopause at 2-potential vorticity units (2-PVU) surface. The two indices are designed to represent primary characteristics of the two types of cold surge. Composite analyses based on the distribution of the two indices clearly demonstrate the dynamic evolutions of corresponding cold surge types.
 The present study reveals the changes in the characteristics of cold surges over East Asia associated with the Arctic Oscillation (AO). The blocking type of cold surge tends to occur during negative AO periods, that is, the AO-related polarity of the blocking type. However, the wave train type is observed during both positive and negative AO periods, although the wave train features associated with negative AO are relatively weaker. The cold surges during negative AO are stronger than those during positive AO in terms of both amplitude and duration. The cold surges during positive AO in which the extent of effect is confined to inland China passes through East Asia quickly because of weaker Siberian high and Aleutian low, leading to short duration of these cold surges. In contrast, the cold surge during negative AO, characterized by a well-organized anticyclone–cyclone couplet, brings continuous cold air into the entire East Asian region for more than one week with long-lasting cold advection. It is also found that the tracks of the cold surges during negative AO tend to occur more frequently over Korea and Japan and less frequently over China, compared with those during positive AO.  

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