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2018년 8월 1일 홍천에서의 기록적인 고온 사례(41.0oC)에 영향을 준 푄 바람

Effect of Foehn Wind on Record-Breaking High Temperature Event (41.0oC) at Hongcheon on 1 August 2018

김유진|이재규|김석환
한국기상학회 (Korean Meteorological Society)|2021.06|대기 (Atmosphere)|제31권 제2호|pp. 199-214|DOI 10.14191/Atmos.2021.31.2.199

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참고문헌

키워드

Extreme high surface air temperaturefoehnbackward trajectory analysisLagrangian energy budget analysisdiabatic heating
주제분류대기과학

초록

A record-breaking high surface air temperature of 41.0oC was observed on 1 August 2018 at Hongcheon, South Korea. In this study, to quantitatively determine the formation mechanism of this extremely high surface air temperature, particularly considering the contributions of the foehn and the foehnlike wind, observational data from Korea Meteorological Administration (KMA) and the Weather Research and Forecasting (WRF) model were utilized. In the backward trajectory analysis, trajectories of 100 air parcels were released from the surface over Hongcheon at 1600 LST on 1 August 2018. Among them, the 47 trajectories (38 trajectories) are tracked back above (below) heights of 1.4 km above mean sea level at 0900 LST 31 July 2018 and are defined as upper (lower) routes. Lagrangian energy budget analysis shows that for the upper routes, adiabatic heating (11.886 × 103 J kg1) accounts for about 77% of the increase in the thermal energy transfer to the air parcels, while the rest (23%) is diabatic heating (3.650 × 103 J kg1). On the other hand, for the lower routes, adiabatic heating (6.111 × 103 J kg1) accounts for about 49% of the increase, the rest (51%) being diabatic heating (6.295 × 103 J kg1). Even though the contribution of the diabatic heating to the increase in the air temperature rather varies according to the routes, the contribution of the diabatic heating should be considered. The diabatic heating is caused by direct heating associated with surface sensible heat flux and heating associated with the turbulent mixing. This mechanism is the Type 4 foehn described in Takane and Kusaka (2011). It is concluded that Type 4 foehn wind occurs and plays an important role in the extreme event on 1 August 2018.

Abstract

A record-breaking high surface air temperature of 41.0oC was observed on 1 August 2018 at Hongcheon, South Korea. In this study, to quantitatively determine the formation mechanism of this extremely high surface air temperature, particularly considering the contributions of the foehn and the foehnlike wind, observational data from Korea Meteorological Administration (KMA) and the Weather Research and Forecasting (WRF) model were utilized. In the backward trajectory analysis, trajectories of 100 air parcels were released from the surface over Hongcheon at 1600 LST on 1 August 2018. Among them, the 47 trajectories (38 trajectories) are tracked back above (below) heights of 1.4 km above mean sea level at 0900 LST 31 July 2018 and are defined as upper (lower) routes. Lagrangian energy budget analysis shows that for the upper routes, adiabatic heating (11.886 × 103 J kg1) accounts for about 77% of the increase in the thermal energy transfer to the air parcels, while the rest (23%) is diabatic heating (3.650 × 103 J kg1). On the other hand, for the lower routes, adiabatic heating (6.111 × 103 J kg1) accounts for about 49% of the increase, the rest (51%) being diabatic heating (6.295 × 103 J kg1). Even though the contribution of the diabatic heating to the increase in the air temperature rather varies according to the routes, the contribution of the diabatic heating should be considered. The diabatic heating is caused by direct heating associated with surface sensible heat flux and heating associated with the turbulent mixing. This mechanism is the Type 4 foehn described in Takane and Kusaka (2011). It is concluded that Type 4 foehn wind occurs and plays an important role in the extreme event on 1 August 2018.

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