The Spatial Distribution and Recent Trend of Frost Occurrence Days in South Korea

최근 한국의 서리 현상의 공간 분포와 시계열 변화 경향

  • Published : 2006.06.01

Abstract

The purpose of this paper is to analyze temporal trends and spatial distribution of frost occurrence days using 54 weather stations under the Korea Meteorological Administration during the recent 30years ($1971{\sim}2000$). The frost occurrence days in the middle inland area was more than in the coastal area, but the period of free-frost days in the coastal area was longer than that in the middle inland. In the southern and eastern coastal areas, the frost day was more than in the western coastal area. The distribution of the first frost day was similar to that of the last frost day. The first frost day in the coastal area appeared a month later than that in the middle inland. The last frost day in the coastal area appeared $20{\sim}25$ days later than that in the middle inland. At most of stations which the first frost day was getting delayed and the last frost day earlier, the frost occurrence days showed a decreasing trend. However, in some stations, the frost occurrence day was increasing. As the frost days in October, March and April at some stations showed an increasing trend, the damage due to the frost might be increased in some areas in South Korea.

최근 30년간($1971{\sim}2000$년) 54개의 전국 기상관측 지점의 서리 현상 자료를 이용하여 공간 분포와 시계열 변화 경향을 분석하였다. 서리 현상일수는 내륙이 많고 해안으로 갈수록 적은 반면, 무상기간은 내륙이 짧고 해안이 길다. 남해안과 동해안이 서해안에 비해 서리 현상일수는 적고 무상일수는 많다. 서리 시작일과 종료일도 경향이 비슷한데 내륙 지역의 첫 서리일은 10월 상순으로 해안 지역보다 한 달 빠르며, 마지막 서리일은 4월 하순으로 해안 지역보다 $20{\sim}25$일 정도 늦다. 첫 서리일이 늦어지고 마지막 서리일은 빨라지는 경우 대부분 지점들은 서리 현상일수가 감소하였으나, 증가하거나 변화가 없는 지점들도 있었다. 반면, 첫 서리일은 빨라지고 마지막 서리일은 늦어지는 경우에 해당하는 지점들은 모두 서리 현상일이 증가했다. 서리 현상일수가 증가한 지점들의 월별 변화를 보면 11월과 3월, 4월이 증가하는 경향이어서 서리에 의한 피해는 더 커질 수 있다.

Keywords

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