Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea

Abstract The negative impact of extreme high-temperature days (EHDs) on people’s livelihood has increased over the past decades. Therefore, an improved understanding of the fundamental mechanisms of EHDs is imperative to mitigate this impact. Herein, we classify the large-scale atmospheric circulati...

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Autores principales:	Han-Kyoung Kim, Byung-Kwon Moon, Maeng-Ki Kim, Jong-Yeon Park, Yu-Kyung Hyun
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/01187dd235c34d05a2262c23a40eb8e6
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spelling	oai:doaj.org-article:01187dd235c34d05a2262c23a40eb8e62021-12-02T17:13:27ZThree distinct atmospheric circulation patterns associated with high temperature extremes in South Korea10.1038/s41598-021-92368-92045-2322https://doaj.org/article/01187dd235c34d05a2262c23a40eb8e62021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92368-9https://doaj.org/toc/2045-2322Abstract The negative impact of extreme high-temperature days (EHDs) on people’s livelihood has increased over the past decades. Therefore, an improved understanding of the fundamental mechanisms of EHDs is imperative to mitigate this impact. Herein, we classify the large-scale atmospheric circulation patterns associated with EHDs that occurred in South Korea from 1982 to 2018 using a self-organizing map (SOM) and investigate the dynamic mechanism for each cluster pattern through composite analysis. A common feature of all SOM clusters is the positive geopotential height (GPH) anomaly over the Korean Peninsula, which provides favorable conditions for EHDs through adiabatic warming caused by anomalous downward motion. Results show that Cluster 1 (C1) is related to the eastward-propagating wave train in the mid-latitude Northern Hemisphere, while Cluster 2 (C2) and 3 (C3) are influenced by a northward-propagating wave train forced by enhanced convection in the subtropical western North Pacific (WNP). Compared to C2, C3 exhibits strong and eastward-extended enhanced convection over the subtropical WNP, which generates an anomalous high-pressure system over the southern part of the Kamchatka Peninsula, reinforcing EHDs via atmospheric blocking. Our results can contribute to the understanding of East Asia climate variability because wave trains influence the climate dynamics of this region.Han-Kyoung KimByung-Kwon MoonMaeng-Ki KimJong-Yeon ParkYu-Kyung HyunNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Han-Kyoung Kim Byung-Kwon Moon Maeng-Ki Kim Jong-Yeon Park Yu-Kyung Hyun Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea
description	Abstract The negative impact of extreme high-temperature days (EHDs) on people’s livelihood has increased over the past decades. Therefore, an improved understanding of the fundamental mechanisms of EHDs is imperative to mitigate this impact. Herein, we classify the large-scale atmospheric circulation patterns associated with EHDs that occurred in South Korea from 1982 to 2018 using a self-organizing map (SOM) and investigate the dynamic mechanism for each cluster pattern through composite analysis. A common feature of all SOM clusters is the positive geopotential height (GPH) anomaly over the Korean Peninsula, which provides favorable conditions for EHDs through adiabatic warming caused by anomalous downward motion. Results show that Cluster 1 (C1) is related to the eastward-propagating wave train in the mid-latitude Northern Hemisphere, while Cluster 2 (C2) and 3 (C3) are influenced by a northward-propagating wave train forced by enhanced convection in the subtropical western North Pacific (WNP). Compared to C2, C3 exhibits strong and eastward-extended enhanced convection over the subtropical WNP, which generates an anomalous high-pressure system over the southern part of the Kamchatka Peninsula, reinforcing EHDs via atmospheric blocking. Our results can contribute to the understanding of East Asia climate variability because wave trains influence the climate dynamics of this region.
format	article
author	Han-Kyoung Kim Byung-Kwon Moon Maeng-Ki Kim Jong-Yeon Park Yu-Kyung Hyun
author_facet	Han-Kyoung Kim Byung-Kwon Moon Maeng-Ki Kim Jong-Yeon Park Yu-Kyung Hyun
author_sort	Han-Kyoung Kim
title	Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea
title_short	Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea
title_full	Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea
title_fullStr	Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea
title_full_unstemmed	Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea
title_sort	three distinct atmospheric circulation patterns associated with high temperature extremes in south korea
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/01187dd235c34d05a2262c23a40eb8e6
work_keys_str_mv	AT hankyoungkim threedistinctatmosphericcirculationpatternsassociatedwithhightemperatureextremesinsouthkorea AT byungkwonmoon threedistinctatmosphericcirculationpatternsassociatedwithhightemperatureextremesinsouthkorea AT maengkikim threedistinctatmosphericcirculationpatternsassociatedwithhightemperatureextremesinsouthkorea AT jongyeonpark threedistinctatmosphericcirculationpatternsassociatedwithhightemperatureextremesinsouthkorea AT yukyunghyun threedistinctatmosphericcirculationpatternsassociatedwithhightemperatureextremesinsouthkorea
_version_	1718381300028538880

Three distinct atmospheric circulation patterns associated with high temperature extremes in South Korea

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