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Influence of Atmospheric Rivers on Regional Precipitation in South Korea
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대기의 강이 한반도 지역별 강수에 미치는 영향

논문 기본 정보

Type
Academic journal
Author
Yeeun Kwon (서울대학교) Chanil Park (서울대학교) Seung-Yoon Back (서울대학교) Seok-Woo Son (서울대학교) Jinwon Kim (국립기상과학원) Eun Jeong Cha (국립기상과학원)
Journal
Korean Meteorological Society Atmosphere-Korea Vol.32 No.2 KCI Accredited Journals ESCI
Published
2022.6
Pages
135 - 148 (14page)

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Result
Influence of Atmospheric Rivers on Regional Precipitation in South Korea
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This study investigates the influence of atmospheric river (AR) on precipitation over South Korea with a focus on regional characteristics. The 42-year-long catalog of ARs, which is obtained by applying the automatic AR detection algorithm to ERA5 reanalysis data and the in-situ precipitation data recorded at 56 weather stations across the country are used to quantify their relationship. Approximately 51% of the climatological annual precipitation is associated with AR. The AR-related precipitation is most pronounced in summer by approximately 58%, while only limited fraction of precipitation (26%) is AR-related in winter. The heavy precipitation (> 30 mm day<SUP>-1</SUP>) is more prone to AR activity (59%) than weak precipitation (5~30 mm day<SUP>-1</SUP>; 33%) in all seasons. By grouping weather stations into the four sub-regions based on orography, it is found that the contribution of AR precipitation to the total is largest in the southern coast (57%) and smallest in the eastern coast (36%). Similar regional variations in AR precipitation fractions also occur in weak precipitation events. The regional contrast between the northern and southern stations is related to the seasonal variation of AR-frequency. In addition, the regional contrast between the western and eastern stations is partly modulated by the orographic forcing. The fractional contribution of AR to heavy precipitation exceeds 50% in all seasons, but this is true only in summer along the eastern coast. This result indicates that ARs play a critical role in heavy precipitation in South Korea, thus routine monitoring of ARs is needed for improving operational hydrometeorological forecasting.
#Atmospheric river #Korea precipitation #Regional characteristics

Contents

Abstract
1. 서론
2. 자료 및 연구방법
3. 동아시아 AR 특성
4. AR의 한반도 강수 영향
5. 요약 및 토의
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