수치모델자료를 이용한 영동지방의 대설사례 특성 분석

Abstract

The characteristics of the snowfall in Youngdong region shows are heavy snowfall in geographically restrict range and in same region, there is a remarkable contrast between snow accumulation and snow day. The distance from the coast line to divide the line of a mountain range plays an important role in snowfall. For understanding distribution of the snowfall amount and genesis system of snowfall at this region which shows various snowfall pattern, it is very important to classify and study patterns of the snowfall events. This study focuses on analyzing and understanding of the numerical model assimilation due to three-demensional analysis system (KLAPS) data to get at the characteristic of heavy snowfall in Youngdong region. There's establish of the cold-coastal conceptual model in Gangwon Youngdong region and contribution in improvement of analysis and forecast ability about local heavy snowfall. For this, due to the record-breaking case of heavy snowfall for fourty years, amounted to 62.5cm (22 Dec. 2008), which is occuring in Sokcho from 21 Dec. 2008 to 22 Dec. 2008, the highest-resolutional data which is offered from KLAPS is used. Considering that air temperature gradient of the lower and upper part of the troposphere, the direction of the wind and wind velocity of the lower part, and the change of the sea air refraction (difference in sea-water temperature and temperature) in Youngdong region and the East sea Buoy that is adjacent to and etc. are regarded as a critical variable to conclude snowfall pattern. The convergence air current is strengthen at windward side and leads to more and more snowfall, and also thermal ridge is stretched to Youngdong region and related lower layer wind curtain is persistently flow into Youngdong region in the East sea. Strong northeast air current (chill air current) from high latitude and strong southwest air current (warm air current) from low latitude flow into this convergence zone at the center, after that these currents meet on the East sea and then, heavy snowfall is generating by relocating the center of the convergence from Youngdong region to the Tae back as time goes by. The snowfall pattern of cold-coastal model in rich precipitation in the costal area rather than mountainous area, surface wind shows NW in Youngseo region, NE in Youngdong region, and the lower troposphere wind shows NE in the lower part, NNE-NW wind in the upper part. The upper and the lower layer's the change of the direction of the wind is affected by an influx of the upper layer's cold air. When the isobar is arranged to north and south direction due to developing cP and then expand to the Maritime Province in Russia, the lower layer of NE system which is provided heat and moisture from the oceans which is relatively warm passing the East sea, is affected by the topography of Youngdong region. It is analyzed that the cost-coastal heavy snowfall in Youngdong region seems to appear by this lower layer of the NE system.