Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs

Abstract Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ15N values of bulk sediments collected at Site U1456 of the International Ocean Discovery Program (IODP) Expedition 355 reveal the orbita...

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Autores principales:	Ji-Eun Kim, Boo-Keun Khim, Minoru Ikehara, Jongmin Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/60a41988bd524c92a8e32a3a2d047054
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spelling	oai:doaj.org-article:60a41988bd524c92a8e32a3a2d0470542021-12-02T16:08:27ZOrbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs10.1038/s41598-018-25415-72045-2322https://doaj.org/article/60a41988bd524c92a8e32a3a2d0470542018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25415-7https://doaj.org/toc/2045-2322Abstract Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ15N values of bulk sediments collected at Site U1456 of the International Ocean Discovery Program (IODP) Expedition 355 reveal the orbital-scale denitrification history in response to the Indian Monsoon. Age reconstruction based on the correlation of planktonic foraminifera (Globigerinoides ruber) δ18O values with the LR04 stack together with the shipboard biostratigraphic and paleomagnetic data assigns the study interval to be 1.2 Ma. Comparison of δ15N values during the last 800 kyrs between Site U1456 (Eastern Arabian Sea) and Site 722B (Western Arabian Sea) showed that δ15N values were high during interglacial periods, indicating intensified denitrification, while the opposite was observed during glacial periods. Taking 6‰ as the empirical threshold of denitrification, the Eastern Arabian Sea has experienced a persistent oxygen minimum zone (OMZ) to maintain strong denitrification whereas the Western Arabian Sea has undergone OMZ breakdown during some glacial periods. The results of this study also suggests that five principal oceanographic conditions were changed in response to the Indian Monsoon following the interglacial and glacial cycles, which controls the degree of denitrification in the Arabian Sea.Ji-Eun KimBoo-Keun KhimMinoru IkeharaJongmin LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ji-Eun Kim Boo-Keun Khim Minoru Ikehara Jongmin Lee Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs
description	Abstract Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ15N values of bulk sediments collected at Site U1456 of the International Ocean Discovery Program (IODP) Expedition 355 reveal the orbital-scale denitrification history in response to the Indian Monsoon. Age reconstruction based on the correlation of planktonic foraminifera (Globigerinoides ruber) δ18O values with the LR04 stack together with the shipboard biostratigraphic and paleomagnetic data assigns the study interval to be 1.2 Ma. Comparison of δ15N values during the last 800 kyrs between Site U1456 (Eastern Arabian Sea) and Site 722B (Western Arabian Sea) showed that δ15N values were high during interglacial periods, indicating intensified denitrification, while the opposite was observed during glacial periods. Taking 6‰ as the empirical threshold of denitrification, the Eastern Arabian Sea has experienced a persistent oxygen minimum zone (OMZ) to maintain strong denitrification whereas the Western Arabian Sea has undergone OMZ breakdown during some glacial periods. The results of this study also suggests that five principal oceanographic conditions were changed in response to the Indian Monsoon following the interglacial and glacial cycles, which controls the degree of denitrification in the Arabian Sea.
format	article
author	Ji-Eun Kim Boo-Keun Khim Minoru Ikehara Jongmin Lee
author_facet	Ji-Eun Kim Boo-Keun Khim Minoru Ikehara Jongmin Lee
author_sort	Ji-Eun Kim
title	Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs
title_short	Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs
title_full	Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs
title_fullStr	Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs
title_full_unstemmed	Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs
title_sort	orbital-scale denitrification changes in the eastern arabian sea during the last 800 kyrs
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/60a41988bd524c92a8e32a3a2d047054
work_keys_str_mv	AT jieunkim orbitalscaledenitrificationchangesintheeasternarabianseaduringthelast800kyrs AT bookeunkhim orbitalscaledenitrificationchangesintheeasternarabianseaduringthelast800kyrs AT minoruikehara orbitalscaledenitrificationchangesintheeasternarabianseaduringthelast800kyrs AT jongminlee orbitalscaledenitrificationchangesintheeasternarabianseaduringthelast800kyrs
_version_	1718384471769612288

Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs

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