The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors

Abstract The mechanisms driving the variations in the centennial-scale East Asian summer monsoon (EASM) remain unclear. Here, we use the δ18O records from adult ostracode shells to reconstruct the EASM variations over the last 3 kyrs in southwestern Japan. A common variation with a 200 yr periodicit...

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Autores principales:	Katsura Yamada, Kazuma Kohara, Minoru Ikehara, Koji Seto
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7127210a16b440098a30efac14b1d153
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spelling	oai:doaj.org-article:7127210a16b440098a30efac14b1d1532021-12-02T15:09:28ZThe variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors10.1038/s41598-019-41359-y2045-2322https://doaj.org/article/7127210a16b440098a30efac14b1d1532019-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-41359-yhttps://doaj.org/toc/2045-2322Abstract The mechanisms driving the variations in the centennial-scale East Asian summer monsoon (EASM) remain unclear. Here, we use the δ18O records from adult ostracode shells to reconstruct the EASM variations over the last 3 kyrs in southwestern Japan. A common variation with a 200 yr periodicity among the Asian monsoonal regions was recognized between BC 800 and BC 100. Since then, neither a correlation between the EASM variation and solar activity or a common EASM variation through EASM regions has been identified. The evidence reveals that solar activity dominantly affected the centennial-scale EASM variations throughout Asian monsoonal regions until BC 100. Furthermore, factors other than solar activity that varied and differed in specific regions controlled the EASM intensity due to decreasing summer solar insolation in the Northern Hemisphere after BC 100. These relations indicate that the dominant factor that affects the EASM variations shifts according to the solar insolation intensity.Katsura YamadaKazuma KoharaMinoru IkeharaKoji SetoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-8 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Katsura Yamada Kazuma Kohara Minoru Ikehara Koji Seto The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors
description	Abstract The mechanisms driving the variations in the centennial-scale East Asian summer monsoon (EASM) remain unclear. Here, we use the δ18O records from adult ostracode shells to reconstruct the EASM variations over the last 3 kyrs in southwestern Japan. A common variation with a 200 yr periodicity among the Asian monsoonal regions was recognized between BC 800 and BC 100. Since then, neither a correlation between the EASM variation and solar activity or a common EASM variation through EASM regions has been identified. The evidence reveals that solar activity dominantly affected the centennial-scale EASM variations throughout Asian monsoonal regions until BC 100. Furthermore, factors other than solar activity that varied and differed in specific regions controlled the EASM intensity due to decreasing summer solar insolation in the Northern Hemisphere after BC 100. These relations indicate that the dominant factor that affects the EASM variations shifts according to the solar insolation intensity.
format	article
author	Katsura Yamada Kazuma Kohara Minoru Ikehara Koji Seto
author_facet	Katsura Yamada Kazuma Kohara Minoru Ikehara Koji Seto
author_sort	Katsura Yamada
title	The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors
title_short	The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors
title_full	The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors
title_fullStr	The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors
title_full_unstemmed	The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors
title_sort	variations in the east asian summer monsoon over the past 3 kyrs and the controlling factors
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/7127210a16b440098a30efac14b1d153
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The variations in the East Asian summer monsoon over the past 3 kyrs and the controlling factors

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