Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods

The abnormal characteristics of extremely warm early summer (EWES) in North China under different decadal backgrounds were contrastively analyzed. Their relationships with upper- and lower-level atmospheric circulation and global sea surface temperature anomalies (SSTAs) are also discussed. Results...

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Autores principales:	Xiaofan Li, Zhiping Yao, Xiaojuan Wang, Changwen Yu, Shaojing Che, Zhiqiang Gong, Guolin Feng, Tianyu Li
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	the North China extremely warm early summer decadal backgrounds atmospheric circulation sea surface temperature Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/4d4246fe78a44cb987235728e8ae3577
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spelling	oai:doaj.org-article:4d4246fe78a44cb987235728e8ae35772021-11-15T06:58:44ZPossible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods2624-955310.3389/fclim.2021.762997https://doaj.org/article/4d4246fe78a44cb987235728e8ae35772021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fclim.2021.762997/fullhttps://doaj.org/toc/2624-9553The abnormal characteristics of extremely warm early summer (EWES) in North China under different decadal backgrounds were contrastively analyzed. Their relationships with upper- and lower-level atmospheric circulation and global sea surface temperature anomalies (SSTAs) are also discussed. Results show that temperature anomalies of EWES in North China are overall higher than normal in both cold (1961–1993) and warm (1994–2019) periods, but the anomalies of the latter are much higher than that of the former. EWES in North China is directly related to the circulation lying between 40° and 50°N in the middle troposphere, which leads to positive temperature anomalies occurring from the bottom to the upper level of the troposphere together with a high anomaly trend tilting northward. The persistent and strong Eurasian continental high (ECH) and weak Northeast China cold vortex (NECV) activity, together with the strong western Pacific subtropical high (WPSH) are major factors that directly lead to EWES in North China. ECH and WPSH are stronger and larger, and NECV are weaker and more northward in the warm period than in the cold period. In addition, the positive SSTAs in the tropical Indian Ocean and the Kuroshio area are favorable for the stronger and larger ECH and WPSH as well as the weaker and more northward NECV, causing strong anticyclonic and downward circulation system controlling North China, resulting in the extremely warm temperatures there. The joint impact of the positive tropical Indian Ocean SSTAs and the Kuroshio region SSTAs is more significant during warm than cold periods, resulting in much stronger EWES in North China during warm periods.Xiaofan LiXiaofan LiZhiping YaoXiaojuan WangChangwen YuChangwen YuShaojing CheShaojing CheZhiqiang GongZhiqiang GongGuolin FengTianyu LiFrontiers Media S.A.articlethe North Chinaextremely warm early summerdecadal backgroundsatmospheric circulationsea surface temperatureEnvironmental sciencesGE1-350ENFrontiers in Climate, Vol 3 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	the North China extremely warm early summer decadal backgrounds atmospheric circulation sea surface temperature Environmental sciences GE1-350
spellingShingle	the North China extremely warm early summer decadal backgrounds atmospheric circulation sea surface temperature Environmental sciences GE1-350 Xiaofan Li Xiaofan Li Zhiping Yao Xiaojuan Wang Changwen Yu Changwen Yu Shaojing Che Shaojing Che Zhiqiang Gong Zhiqiang Gong Guolin Feng Tianyu Li Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods
description	The abnormal characteristics of extremely warm early summer (EWES) in North China under different decadal backgrounds were contrastively analyzed. Their relationships with upper- and lower-level atmospheric circulation and global sea surface temperature anomalies (SSTAs) are also discussed. Results show that temperature anomalies of EWES in North China are overall higher than normal in both cold (1961–1993) and warm (1994–2019) periods, but the anomalies of the latter are much higher than that of the former. EWES in North China is directly related to the circulation lying between 40° and 50°N in the middle troposphere, which leads to positive temperature anomalies occurring from the bottom to the upper level of the troposphere together with a high anomaly trend tilting northward. The persistent and strong Eurasian continental high (ECH) and weak Northeast China cold vortex (NECV) activity, together with the strong western Pacific subtropical high (WPSH) are major factors that directly lead to EWES in North China. ECH and WPSH are stronger and larger, and NECV are weaker and more northward in the warm period than in the cold period. In addition, the positive SSTAs in the tropical Indian Ocean and the Kuroshio area are favorable for the stronger and larger ECH and WPSH as well as the weaker and more northward NECV, causing strong anticyclonic and downward circulation system controlling North China, resulting in the extremely warm temperatures there. The joint impact of the positive tropical Indian Ocean SSTAs and the Kuroshio region SSTAs is more significant during warm than cold periods, resulting in much stronger EWES in North China during warm periods.
format	article
author	Xiaofan Li Xiaofan Li Zhiping Yao Xiaojuan Wang Changwen Yu Changwen Yu Shaojing Che Shaojing Che Zhiqiang Gong Zhiqiang Gong Guolin Feng Tianyu Li
author_facet	Xiaofan Li Xiaofan Li Zhiping Yao Xiaojuan Wang Changwen Yu Changwen Yu Shaojing Che Shaojing Che Zhiqiang Gong Zhiqiang Gong Guolin Feng Tianyu Li
author_sort	Xiaofan Li
title	Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods
title_short	Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods
title_full	Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods
title_fullStr	Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods
title_full_unstemmed	Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods
title_sort	possible causes of extremely warm early summer in north china during cold and warm periods
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/4d4246fe78a44cb987235728e8ae3577
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Possible Causes of Extremely Warm Early Summer in North China During Cold and Warm Periods

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