Classification and Key Factors for the Snowfall over the Eastern Part of the Korean Peninsula

IF 2.2 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Byeong-Hun Hwang, Soojin Yoo, Eun-Chul Chang, Francisco J. Tapiador, Kwonil Kim, GyuWon Lee
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引用次数: 0

Abstract

Typical snowfall structure over the coastal mountainous region of the Korean Peninsula is investigated. East coast-type snowfall (ET) due to the lake-effect over the East Sea of Korea is dominant for snowfall intensity and duration. The ET can be divided by the high-pressure system over the Gaema Plateau (GH) and the extratropical low-pressure system passing southern part of the Korean Peninsula in addition to the GH pattern (GHSL). Composite analysis showed that the GHSL can allow a greater inflow of the snowfall from the sea into the land than the GH. The key factors for snowfall structure are 1) the wind-turning layer (WTL), which is the transition level from the lower-level easterly to the upper-level westerly; 2) vertical wind shear suppressing updrafts near the WTL and 3) the Froude number (Fr), which determines the snowfall penetration beyond the mountain. A higher WTL height indicates a deeper easterly layer, indicating favorable conditions for inland snowfall penetration. The strong vertical wind shear plays a role of suppressed updrafts near the WTL via downward momentum transport. It is presented that updraft limitation is mostly exerted by the wind shear. Fr indicates whether the weather system is blocked or unblocked by the mountains. It is shown that the larger Fr generally increases with height, which means that snow systems or flows near the mountain tops can easily to overcome the topography. It is shown that both dynamic and thermodynamic factors are important for understanding and predicting the structure and regions of snowfall.

朝鲜半岛东部降雪的分类和关键因素
研究了朝鲜半岛沿海山区典型的降雪结构。在降雪量和持续时间上,由东海湖效应引起的东海岸型降雪(ET)占主导地位。除了GH型(GHSL)外,ga高原上空的高压系统(GH)和经过朝鲜半岛南部的温带低压系统(GHSL)也可以划分为ET。综合分析表明,GHSL比GH允许更大的降雪从海洋流入陆地。影响降雪结构的关键因素是:1)转风层(WTL),它是低层东风向高层西风的过渡层;2)垂直风切变抑制了WTL附近的上升气流,3)弗鲁德数(Fr)决定了山外的降雪穿透。WTL高度越高,表明偏东层越深,有利于内陆降雪穿透。强垂直风切变通过下行动量输送在西温带附近起到抑制上升气流的作用。认为上升气流限制主要是由风切变施加的。Fr表示天气系统是否被山脉阻挡。结果表明,较大的Fr通常随高度的增加而增加,这意味着山顶附近的雪系统或雪流可以很容易地克服地形。结果表明,动力因子和热力学因子对于理解和预测降雪的结构和区域都很重要。
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来源期刊
Asia-Pacific Journal of Atmospheric Sciences
Asia-Pacific Journal of Atmospheric Sciences 地学-气象与大气科学
CiteScore
5.50
自引率
4.30%
发文量
34
审稿时长
>12 weeks
期刊介绍: The Asia-Pacific Journal of Atmospheric Sciences (APJAS) is an international journal of the Korean Meteorological Society (KMS), published fully in English. It has started from 2008 by succeeding the KMS'' former journal, the Journal of the Korean Meteorological Society (JKMS), which published a total of 47 volumes as of 2011, in its time-honored tradition since 1965. Since 2008, the APJAS is included in the journal list of Thomson Reuters’ SCIE (Science Citation Index Expanded) and also in SCOPUS, the Elsevier Bibliographic Database, indicating the increased awareness and quality of the journal.
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