우리나라 초미세먼지 극한현상 발생의 시공간적 특징과 동아시아 종관기후장의 차이
Spatio-temporal Occurrence Characteristics of Extreme Ultrafine Dust Events in the Republic of Korea and the Associated Differences in Synoptic Climate Fields around East Asia
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초록
The purpose of this study is to examine spatial and temporal characteristics of regional-scale extreme ultrafine dust events (EUDEs) in the Repubic of Korea and additionally to explore the differrences in the synoptic climate patterns among major regional-scale EUDEs types. To achieve these goals, the regional-scale EUDEs data sets of daily PM 2.5 exceeding 35 (75) ㎍/㎥ of bad (very bad) level are established based on numerous ground observational site data for the last 10-year period (2015-2024). As a result, three major regional types including central western region type, southwestern interior region type, and their combined regional type are recognized for both bad level EUDEs and very bad level EUDEs in the Republic of Korea. Temporally, these bad level and very bad level EUDEs show the tendency that they occur frequently between mid-winter and early spring when the cumulative precipitation during a year is lowest and that their annual occurrences had increased during the pre-COVID19 period in the 2010s. The analyses of synoptic climate patterns associated with the Asian winter monsoon circulation for multi-EUDEs demonstrate that surface pressure and vector wind anomalis around the Korean Peninsula for these major regional EUDEs types vary amongst late autumn-early winter, mid-winter and late winter-early spring. These results suggest that the anomaly combinations of the Siberian high pressure and the Aleutian low pressure in association with the undulation of circumpolar vortex could be considered as a predictor of the EUDE occurrences in Korea.
Abstract
The purpose of this study is to examine spatial and temporal characteristics of regional-scale extreme ultrafine dust events (EUDEs) in the Repubic of Korea and additionally to explore the differrences in the synoptic climate patterns among major regional-scale EUDEs types. To achieve these goals, the regional-scale EUDEs data sets of daily PM 2.5 exceeding 35 (75) ㎍/㎥ of bad (very bad) level are established based on numerous ground observational site data for the last 10-year period (2015-2024). As a result, three major regional types including central western region type, southwestern interior region type, and their combined regional type are recognized for both bad level EUDEs and very bad level EUDEs in the Republic of Korea. Temporally, these bad level and very bad level EUDEs show the tendency that they occur frequently between mid-winter and early spring when the cumulative precipitation during a year is lowest and that their annual occurrences had increased during the pre-COVID19 period in the 2010s. The analyses of synoptic climate patterns associated with the Asian winter monsoon circulation for multi-EUDEs demonstrate that surface pressure and vector wind anomalis around the Korean Peninsula for these major regional EUDEs types vary amongst late autumn-early winter, mid-winter and late winter-early spring. These results suggest that the anomaly combinations of the Siberian high pressure and the Aleutian low pressure in association with the undulation of circumpolar vortex could be considered as a predictor of the EUDE occurrences in Korea.
참고문헌 (28)
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