영동지역 장기간(2000~2020년) 활강 강풍 특성 (Characteristics of Long-term (2000~2020) Downslope Windstorm in the Yeongdong Region)

서지정보

· 발행기관 : 한국기상학회
· 수록지 정보 : 대기 / 33권 / 1호 / 21 ~ 32페이지
· 저자명 : 정지훈, 김병곤, 채유진, 최영길, 김지윤, 임병환

초록

Characteristics of downslope windstorm (DW) has been examined mainly based on1-min average wind and the other meteorological conditions in the Yeongdong region for 2000~2020. First, a classification procedure for the downslope windstorm is proposed using surfacewind speed (greater than 99 percentile), 1-hour longevity of strong wind (SW), westerly winddirection, low humidity (less than 20 percentile), and leeside warming. The number of DW dayssatisfying the proposed criteria is 221 (2.9% of total days and 47.5% of SW days) while thenumber of SW days is 465 (6.1% of total days) for 2000~2020. The occurrences of both SWand DW shows distinctive annual variation with its peak in April. In addition, mean wind speedof DW days is 8.2 m s1 with its duration of 2 hr 30 min and relative humidity of 28% at Gangneung.
An episode (7 May 2021) was selected by applying the proposed criteria to SW days of2021. The sounding shows that the layer of wind speed greater than 25 m s1 was lowered downto 925 hPa at Gangneung (leeside) relative to 850 hPa at Hoengseong (Wonju), in the afternoonalong with significant warming and drying. Froude numbers of Wonju and Gangneung for theDW events were increased 4 and 5 times greater than those of normal days, respectively. Thiskind of DW long-term statistics in the leeside of the mountains is thought to build a foundationof further understanding DW mechanism.

영어초록

Characteristics of downslope windstorm (DW) has been examined mainly based on1-min average wind and the other meteorological conditions in the Yeongdong region for 2000~2020. First, a classification procedure for the downslope windstorm is proposed using surfacewind speed (greater than 99 percentile), 1-hour longevity of strong wind (SW), westerly winddirection, low humidity (less than 20 percentile), and leeside warming. The number of DW dayssatisfying the proposed criteria is 221 (2.9% of total days and 47.5% of SW days) while thenumber of SW days is 465 (6.1% of total days) for 2000~2020. The occurrences of both SWand DW shows distinctive annual variation with its peak in April. In addition, mean wind speedof DW days is 8.2 m s1 with its duration of 2 hr 30 min and relative humidity of 28% at Gangneung.
An episode (7 May 2021) was selected by applying the proposed criteria to SW days of2021. The sounding shows that the layer of wind speed greater than 25 m s1 was lowered downto 925 hPa at Gangneung (leeside) relative to 850 hPa at Hoengseong (Wonju), in the afternoonalong with significant warming and drying. Froude numbers of Wonju and Gangneung for theDW events were increased 4 and 5 times greater than those of normal days, respectively. Thiskind of DW long-term statistics in the leeside of the mountains is thought to build a foundationof further understanding DW mechanism.

참고자료

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