Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations
In the summer of 2020, South Korea experienced record-breaking rainfall due to 15 consecutive heavy rainfall events (HREs) from mid-June to early September. Among them, 11 HREs occurred in late June to mid-August with distinct synoptic characteristics depending on the occurrence period. All HREs fro...
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Language: | English |
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American Meteorological Society
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ftponangunivst:oai:oasis.postech.ac.kr:2014.oak/110862 2023-05-15T17:30:10+02:00 Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations PARK, C. SON, S.-W. KIM, H. HAM, Y.-G. KIM, J. CHA, D.-H. CHANG, E.-C. LEE, G. KUG, J.-S. LEE, W.-S. LEE, Y.-Y. LEE, H.C. LIM, B. KUG, J.-S. 2021-09 https://oasis.postech.ac.kr/handle/2014.oak/110862 https://doi.org/10.1175/MWR-D-21-0051.1 English eng American Meteorological Society Monthly Weather Review Meteorology & Atmospheric Sciences 0027-0644 https://oasis.postech.ac.kr/handle/2014.oak/110862 doi:10.1175/MWR-D-21-0051.1 47828 Monthly Weather Review, v.149, no.9, pp.3085 - 3100 000752840500012 2-s2.0-85113526347 monsoon North Atlantic Oscillation rainfall synoptic meteorology teleconnection Pacific Ocean South China Sea South Korea Western North Pacific Rain extratropical cyclone Atmospheric pressure Atmospheric thermodynamics Expansion Storms Atmospheric teleconnections extreme event Extratropical cyclones Large pressure gradients Large-scale circulation Moisture transport Monsoon circulations North Atlantic oscillations Extreme events Monsoons Synoptic-scale processes Teleconnections Article ART 2021 ftponangunivst https://doi.org/10.1175/MWR-D-21-0051.1 2022-10-20T21:05:02Z In the summer of 2020, South Korea experienced record-breaking rainfall due to 15 consecutive heavy rainfall events (HREs) from mid-June to early September. Among them, 11 HREs occurred in late June to mid-August with distinct synoptic characteristics depending on the occurrence period. All HREs from 29 June to 27 July (P1) were triggered by extratropical cyclones, while those from 28 July to 15 August (P2) mainly occurred along the monsoon rainband. We argue that their transition is associated with atmospheric teleconnections. During P1, the western North Pacific subtropical high (WNPSH) anomalously extended westward, but its northward expansion was hindered by the meridional wave train from the suppressed convection over the South China Sea. This condition prevented a northward migration of the monsoon rainband but allowed more extratropical cyclones to pass over the Korean Peninsula, resulting in four HREs. During P2, the South China Sea convection was enhanced, and its circulation response prompted an abrupt northward expansion of the WNPSH with a large pressure gradient along its northern boundary. With intensified southwesterly moisture transport, a monsoon rainband was activated over the Korean Peninsula, producing six HREs. The opposite phases of the summer North Atlantic Oscillation, i.e., negative in P1 but positive in P2, further contributed to the anomalous monsoon circulation by modulating the midlatitude circulation response to the South China Sea convection. This study demonstrates that the nature of summertime HREs in East Asia can be strongly modulated by remote forcings. ? 2021 American Meteorological Society. 1 1 N scie scopus Article in Journal/Newspaper North Atlantic North Atlantic oscillation Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) Pacific Monthly Weather Review |
institution |
Open Polar |
collection |
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS) |
op_collection_id |
ftponangunivst |
language |
English |
topic |
monsoon North Atlantic Oscillation rainfall synoptic meteorology teleconnection Pacific Ocean South China Sea South Korea Western North Pacific Rain extratropical cyclone Atmospheric pressure Atmospheric thermodynamics Expansion Storms Atmospheric teleconnections extreme event Extratropical cyclones Large pressure gradients Large-scale circulation Moisture transport Monsoon circulations North Atlantic oscillations Extreme events Monsoons Synoptic-scale processes Teleconnections |
spellingShingle |
monsoon North Atlantic Oscillation rainfall synoptic meteorology teleconnection Pacific Ocean South China Sea South Korea Western North Pacific Rain extratropical cyclone Atmospheric pressure Atmospheric thermodynamics Expansion Storms Atmospheric teleconnections extreme event Extratropical cyclones Large pressure gradients Large-scale circulation Moisture transport Monsoon circulations North Atlantic oscillations Extreme events Monsoons Synoptic-scale processes Teleconnections PARK, C. SON, S.-W. KIM, H. HAM, Y.-G. KIM, J. CHA, D.-H. CHANG, E.-C. LEE, G. KUG, J.-S. LEE, W.-S. LEE, Y.-Y. LEE, H.C. LIM, B. Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations |
topic_facet |
monsoon North Atlantic Oscillation rainfall synoptic meteorology teleconnection Pacific Ocean South China Sea South Korea Western North Pacific Rain extratropical cyclone Atmospheric pressure Atmospheric thermodynamics Expansion Storms Atmospheric teleconnections extreme event Extratropical cyclones Large pressure gradients Large-scale circulation Moisture transport Monsoon circulations North Atlantic oscillations Extreme events Monsoons Synoptic-scale processes Teleconnections |
description |
In the summer of 2020, South Korea experienced record-breaking rainfall due to 15 consecutive heavy rainfall events (HREs) from mid-June to early September. Among them, 11 HREs occurred in late June to mid-August with distinct synoptic characteristics depending on the occurrence period. All HREs from 29 June to 27 July (P1) were triggered by extratropical cyclones, while those from 28 July to 15 August (P2) mainly occurred along the monsoon rainband. We argue that their transition is associated with atmospheric teleconnections. During P1, the western North Pacific subtropical high (WNPSH) anomalously extended westward, but its northward expansion was hindered by the meridional wave train from the suppressed convection over the South China Sea. This condition prevented a northward migration of the monsoon rainband but allowed more extratropical cyclones to pass over the Korean Peninsula, resulting in four HREs. During P2, the South China Sea convection was enhanced, and its circulation response prompted an abrupt northward expansion of the WNPSH with a large pressure gradient along its northern boundary. With intensified southwesterly moisture transport, a monsoon rainband was activated over the Korean Peninsula, producing six HREs. The opposite phases of the summer North Atlantic Oscillation, i.e., negative in P1 but positive in P2, further contributed to the anomalous monsoon circulation by modulating the midlatitude circulation response to the South China Sea convection. This study demonstrates that the nature of summertime HREs in East Asia can be strongly modulated by remote forcings. ? 2021 American Meteorological Society. 1 1 N scie scopus |
author2 |
KUG, J.-S. |
format |
Article in Journal/Newspaper |
author |
PARK, C. SON, S.-W. KIM, H. HAM, Y.-G. KIM, J. CHA, D.-H. CHANG, E.-C. LEE, G. KUG, J.-S. LEE, W.-S. LEE, Y.-Y. LEE, H.C. LIM, B. |
author_facet |
PARK, C. SON, S.-W. KIM, H. HAM, Y.-G. KIM, J. CHA, D.-H. CHANG, E.-C. LEE, G. KUG, J.-S. LEE, W.-S. LEE, Y.-Y. LEE, H.C. LIM, B. |
author_sort |
PARK, C. |
title |
Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations |
title_short |
Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations |
title_full |
Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations |
title_fullStr |
Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations |
title_full_unstemmed |
Record-breaking summer rainfall in south korea in 2020: Synoptic characteristics and the role of large-scale circulations |
title_sort |
record-breaking summer rainfall in south korea in 2020: synoptic characteristics and the role of large-scale circulations |
publisher |
American Meteorological Society |
publishDate |
2021 |
url |
https://oasis.postech.ac.kr/handle/2014.oak/110862 https://doi.org/10.1175/MWR-D-21-0051.1 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
Monthly Weather Review Meteorology & Atmospheric Sciences 0027-0644 https://oasis.postech.ac.kr/handle/2014.oak/110862 doi:10.1175/MWR-D-21-0051.1 47828 Monthly Weather Review, v.149, no.9, pp.3085 - 3100 000752840500012 2-s2.0-85113526347 |
op_doi |
https://doi.org/10.1175/MWR-D-21-0051.1 |
container_title |
Monthly Weather Review |
_version_ |
1766125994601611264 |