호남남해안 지역의 대설패턴 분석

Abstract

The study of heavy snowfall events on the south coastal region in Honam. What has been relatively low frequency has been implemented for past 18 years from 1991 to 2008. The result of analytic of annual mean snow day was 9.9 days. It is the lowest frequency of snowfall in Honam region. The snowing day which exceed the criterion of heavy snow advisory (more than 5cm) was only has been divided by four days (11 Feb. 1994, 6 Feb. 2006, 17 Feb. 1996 and 31 Jan. 1992). The pressure of the day when heavy snow fall event two patterns in this region. In the first case, it snows when the depression comes from the west passed over the northern yellow sea. But, in the second case, it falls heavy snow due to developing the depression centered over in the south-east yellow sea and expansion of Siberia high (cP). In case of which depression passes the southern yellow sea that come from the west, there is generally high temperature distribution (from 0℃ to -3℃) owing to the depression in the south-west sea. And then it shows both rainfall and snowfall in some regions. Also, the depression is developed when snowfall shows moist snow-flake type, 5580gpm line located on 500hPa weather chart and Siberia high (cP) is weak. Heavy snow is developed on a national scale and the depression moves to northeast direction with center in the south sea area as the warm moist area of the south sea is moved in condition of that the cold is placed by passing the depression. When the depression is developed in center of the south-east sea and heavy snow is occurred due to expansion of Siberia high (cP), South through in the south-east sea affects Yeosu region as Siberia high expands and easteries inflows. The center of the depression is placed in Yeonhaeju region at 500hPa weather chart, this is affected by pressure through. It generally appears low temperature distribution (from -6℃ to -9℃), dry snow-flake type, lots of snowfall in the eastern area which doesn't expand to the western area, and then the cold moves to the south area, this results that the temperature density line is placed in southern area at 850hPa. To analysis of two patterns of Honam, the south sea is useful to increase the accuracy of the prediction of heavy snowfall and to reduce the disaster.