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Two Types of Diurnal Variations in Heavy Rainfall during July over Korea

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Title
Two Types of Diurnal Variations in Heavy Rainfall during July over Korea
Author(s)
Park, Chang-Kyun; Chang, Minhee; Ho, Chang-Hoi; Kyung-Ja Ha; Kim, Jinwon; Sohn, Byung-Ju
Publication Date
2021-12
Journal
Advances in Atmospheric Sciences, v.38, no.12, pp.2201 - 2211
Publisher
Science Press
Abstract
© 2021, The Author(s).This study examined the characteristics of the diurnal variations of heavy rainfall (⩾110 mm in 12 hours) in Korea and the related atmospheric circulation for July from 1980–2020. During the analysis period, two dominant pattens of diurnal variation of the heavy rainfall emerged: all-day heavy rainfall (AD) and morning only heavy rainfall (MO) types. For the AD-type, the heavy rainfall is caused by abundant moisture content in conjunction with active convection in the morning (0000–1200, LST; LST = UTC + 9) and the afternoon hours (1200–2400 LST). These systems are related to the enhanced moisture inflow and upward motion induced by the strengthening of the western North Pacific subtropical high and upper-tropospheric jet. For the MO-type, heavy rainfall occurs mostly in the morning hours; the associated atmospheric patterns are similar to the climatology. We find that the atmospheric pattern related to severe heavy rainfalls in 2020 corresponds to a typical AD-type and resembles the 1991 heavy-rainfall system in its overall synoptic/mesoscale circulations. The present results imply that extremely heavy rainfall episodes in Korea during the 2020 summer may occur again in the future associated with the recurring atmospheric phenomenon related to the heavy rainfall.
URI
https://pr.ibs.re.kr/handle/8788114/10745
DOI
10.1007/s00376-021-1178-8
ISSN
0256-1530
Appears in Collections:
Center for Climate Physics(기후물리 연구단) > 1. Journal Papers (저널논문)
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