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Past summer upwelling events in the Gulf of Oman derived from a coral geochemical record

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Title: Past summer upwelling events in the Gulf of Oman derived from a coral geochemical record
Authors: Watanabe, Takaaki K. Browse this author
Watanabe, Tsuyoshi Browse this author →KAKEN DB
Yamazaki, Atsuko Browse this author
Pfeiffer, Miriam Browse this author
Garbe-Schoenberg, Dieter Browse this author
Claereboudt, Michel R. Browse this author
Issue Date: 4-Jul-2017
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 7
Start Page: 4568
Publisher DOI: 10.1038/s41598-017-04865-5
PMID: 5496871
Abstract: We used a high-resolution oxygen isotope (delta O-18(coral)), carbon isotope (delta O-18(coral)) and Sr/Ca ratios measured in the skeleton of a reef-building coral, Porites sp., to reveal seasonal-scale upwelling events and their interannual variability in the Gulf of Oman. Our delta C-13(coral) record shows sharp negative excursions in the summer, which correlate with known upwelling events. Using delta C-13(coral) anomalies as a proxy for upwelling, we found 17 summer upwelling events occurred in the last 26 years. These anomalous negative excursions of delta C-13(coral) result from upwelled water depleted in C-13 (dissolved inorganic carbon) and decreased water-column transparency. We reconstructed biweekly SSTs from coral Sr/Ca ratios and the oxygen isotopic composition of seawater (delta O-18(SW)) by subtracting the reconstructed Sr/Ca-SST from delta O-18(coral). Significant delta O-18(SW) anomalies occur during major upwelling events. Our results suggest delta C-13(coral) anomalies can be used as a proxy for seasonal upwelling intensity in the Gulf of Oman, which, driven by the Indian/Arabian Summer Monsoon, is subject to interannual variability.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡邊 剛

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