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Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs
Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ(15)N values of bulk sediments collected at Site U1456 of the International Ocean Discovery Program (IODP) Expedition 355 reveal the orbital-scale...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5935671/ https://www.ncbi.nlm.nih.gov/pubmed/29728627 http://dx.doi.org/10.1038/s41598-018-25415-7 |
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author | Kim, Ji-Eun Khim, Boo-Keun Ikehara, Minoru Lee, Jongmin |
author_facet | Kim, Ji-Eun Khim, Boo-Keun Ikehara, Minoru Lee, Jongmin |
author_sort | Kim, Ji-Eun |
collection | PubMed |
description | Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ(15)N 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) δ(18)O values with the LR04 stack together with the shipboard biostratigraphic and paleomagnetic data assigns the study interval to be 1.2 Ma. Comparison of δ(15)N values during the last 800 kyrs between Site U1456 (Eastern Arabian Sea) and Site 722B (Western Arabian Sea) showed that δ(15)N 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 | Online Article Text |
id | pubmed-5935671 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-59356712018-05-10 Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs Kim, Ji-Eun Khim, Boo-Keun Ikehara, Minoru Lee, Jongmin Sci Rep Article Denitrification in the Arabian Sea is closely related to the monsoon-induced upwelling and subsequent phytoplankton production in the surface water. The δ(15)N 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) δ(18)O values with the LR04 stack together with the shipboard biostratigraphic and paleomagnetic data assigns the study interval to be 1.2 Ma. Comparison of δ(15)N values during the last 800 kyrs between Site U1456 (Eastern Arabian Sea) and Site 722B (Western Arabian Sea) showed that δ(15)N 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. Nature Publishing Group UK 2018-05-04 /pmc/articles/PMC5935671/ /pubmed/29728627 http://dx.doi.org/10.1038/s41598-018-25415-7 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Kim, Ji-Eun Khim, Boo-Keun Ikehara, Minoru Lee, Jongmin Orbital-scale denitrification changes in the Eastern Arabian Sea during the last 800 kyrs |
title | 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_short | 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 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5935671/ https://www.ncbi.nlm.nih.gov/pubmed/29728627 http://dx.doi.org/10.1038/s41598-018-25415-7 |
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