[논문]동아시아 대도시에 영향을 미치는 온대저기압의 특성 및 강수 영향 비교: 서울, 베이징, 도쿄

김동현; 이재연; 강준석; 손석우

doi:10.14191/atmos.2021.31.1.045

[국내논문] 동아시아 대도시에 영향을 미치는 온대저기압의 특성 및 강수 영향 비교: 서울, 베이징, 도쿄
Synoptic Structures and Precipitation Impact of Extratropical Cyclones Influencing on East Asia Megacities: Seoul, Beijing, Tokyo 원문보기

대기 = Atmosphere, v.31 no.1, 2021년, pp.45 - 60

김동현 (서울대학교 지구환경과학부) , 이재연 (서울대학교 지구환경과학부) , 강준석 (서울대학교 지구환경과학부) , 손석우 (서울대학교 지구환경과학부)

Abstract ▼ AI-Helper

The synoptic structures and precipitation impact of extratropical cyclones (ETCs) influencing on the three adjacent megacities in East Asia, i.e., Beijing (Beijing ETCs), Seoul (Seoul ETCs) and Tokyo (Tokyo ETCs), are analyzed using ERA-interim reanalysis data from 1979 to 2018. Individual ETC tracks are identified with the automated tracking algorithm applied to 850-hPa relative vorticity field. Among four seasons, ETCs are the most frequent in spring. In this season, Beijing ETCs are mainly generated at the leeside of Altai-Sayan Mountains and primarily develop through interaction between the upper-level trough and lower-level cyclonic circulation. For Seoul ETCs, the leesides of Altai-Sayan Mountains (Seoul-N ETCs) and Tibetan Plateau (Seoul-S ETCs) are main genesis regions and the features of ETCs are different according to the genesis regions. While Seoul-N ETCs mainly develope by the same mechanism of Beijing ETCs, strong diabatic heating due to vapor transport is responsible for the genesis of Seoul-S ETCs. Tokyo ETCs are originated from the leesides of Tibetan Plateau and Kuroshio-Oyashio Extension regions, and strong diabatic heating as well as interaction between upper and lower levels determines the genesis of these ETCs. The precipitation impact resulting from ETCs become strong in the order of Beijing ETCs, Seoul-N ETCs, Seoul-S ETCs, and Tokyo ETCs and accounts for up to 40%, 27%, 52%, and 70% of regional precipitation, respectively.

주제어

표/그림 (9)

그림 Fig. 1. ETC track (shading, units: number month⁻¹) and genesis (brown contour, units: number month⁻¹) frequency for (a) all seasons and (b) spring. Red triangles indicate the locations of each city, Beijing, Seoul, and Tokyo.
그림 Fig. 2. ETC track (black contour, units: number month⁻¹) and genesis (brown contour, units: number month⁻¹) frequency of (a) Beijing ETCs, (b) Seoul ETCs and (c) Tokyo ETCs in all seasons. (d, e, f) Same as (a, b, c) but for spring. Red triangles indicate the locations of each city. The individual tracks of ETCs are also depicted in gray lines.
그림 Fig. 3. Seasonal cycle in the number of ETCs influencing on each city (number month⁻¹) averaged over 1979-2018.
그림 Fig. 4. (a) Geopotential height anomalies at 300 hPa (shading, units: gpm) and mean sea-level pressure anomalies (black solid/dashed contours for positive/negative value, units: hPa) from −24 h to +24 h for Beijing ETCs. The shown anomalies are statistically significant at the 95% confidence level, based on a two-tailed Student's T test. The average ETC locations at each timestep are shown (purple circles) on the average track from −24 h to +24 h (yellow solid lines). (b, c, d) Same as (a), but for Seoul-N ETCs, Seoul-S ETCs, and Tokyo ETCs, respectively. Red triangles indicate the locations of each city.
그림 Fig. 5. Same as Fig. 4, but for vertical cross-section of geopotential height anomalies (shading, units: gpm) and negative vertical pressure velocity anomalies (black dashed contours, units: Pa s⁻¹).
그림 Fig. 6. Same as Fig. 4, but for Integrated Vapor Transport (IVT) (shading, units: kg m⁻¹s⁻¹), IVT vectors (black solid arrow, units: kg m⁻¹s⁻¹), and the diabatic-heating-rate anomalies at 500 hPa level (red solid contour, units: K day⁻¹).
그림 Fig. 7. Time evolution of (a) filtered 850 hPa relative vorticity, (b) mean sea level pressure anomaly, and (c) 850 hPa wind intensity for ETCs influencing on each city.
그림 Fig. 8. (a) Daily precipitation (shading, units: mm day⁻¹) from −24 h to +24 h for Beijing ETCs. The average ETC locations at each timestep are shown (purple circles) on the average track from −24 h to +24 h (yellow solid lines). (b, c, d) Same as (a), but for Seoul-N ETCs, Seoul-S ETCs, and Tokyo ETCs, respectively. Red triangles indicate the locations of each city.
그림 Fig. 9. Climatology of springtime precipitation of each city. For each city, the left and right bars indicate the total precipitation and ETC associated precipitation, respectively.

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