气候变化领域集成服务门户(CCPortal): Oman coral delta O-18 seawater record suggests that Western Indian Ocean upwelling uncouples from the Indian Ocean Dipole during the global-warming hiatus

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DOI	10.1038/s41598-018-38429-y
	Oman coral delta O-18 seawater record suggests that Western Indian Ocean upwelling uncouples from the Indian Ocean Dipole during the global-warming hiatus
	Watanabe, Takaaki K.1; Watanabe, Tsuyoshi 1,2; Yamazaki, Atsuko 1,2,3; Pfeiffer, Miriam 4; Claereboudt, Michel R.5
发表日期	2019
ISSN	2045-2322
卷号	9
英文摘要	The Indian Ocean Dipole (IOD) is an interannual mode of climate variability in the Indian Ocean that has intensified with 20th century global-warming. However, instrumental data shows a global-warming hiatus between the late-1990s and 2015. It is presently not clear how the global-warming hiatus affects modes of climate variability such as the IOD, and their basin-wide ocean-atmosphere teleconnections. Here, we present a 26-year long, biweekly record of Sr/Ca and delta O-18 from a Porites coral drilled in the Gulf of Oman. Sea surface temperature (SSTanom) is calculated from Sr/Ca ratios, and seawater delta O-18 (delta O-18(sw-anom)) is estimated by subtracting the temperature component from coral delta O-18. Our delta(18)Osw-anom record reveals a significant regime shift in 1999, towards lower mean delta O-18(sw) values, reflecting intensified upwelling in the western Indian Ocean. Prior to the 1999 regime shift, our SSTanom and delta O-18(sw-anom) show a clear IOD signature, with higher values in the summer of positive-IOD years due to weakened upwelling. The IOD signature in SSTanom and delta O-18(sw-anom) disappears with the overall intensification of upwelling after the 1999 regime shift. The inferred increase in upwelling is likely driven by an intensified Walker circulation during the global-warming hiatus. Upwelling in the Western Indian Ocean uncouples from the IOD.
WOS研究方向	Science & Technology - Other Topics
来源期刊	SCIENTIFIC REPORTS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/93409
作者单位	1.Hokkaido Univ, Dept Nat Hist Sci, Fac Sci, Sapporo, Hokkaido 0600810, Japan; 2.KIKAI Inst Coral Reef Sci, Kikai Town 8916151, Japan; 3.Kyushu Univ, Dept Earth & Planetary Sci, Fac Sci, Fukuoka, Fukuoka 8190395, Japan; 4.Christian Albrechts Univ Kiel, Inst Geowissensch, D-24118 Kiel, Germany; 5.Sultan Qaboos Univ, Dept Marine Sci & Fisheries, Coll Agr & Marine Sci, Box 34,Al Khod 123, Muscat, Oman
推荐引用方式 GB/T 7714	Watanabe, Takaaki K.,Watanabe, Tsuyoshi,Yamazaki, Atsuko,et al. Oman coral delta O-18 seawater record suggests that Western Indian Ocean upwelling uncouples from the Indian Ocean Dipole during the global-warming hiatus[J],2019,9.
APA	Watanabe, Takaaki K.,Watanabe, Tsuyoshi,Yamazaki, Atsuko,Pfeiffer, Miriam,&Claereboudt, Michel R..(2019).Oman coral delta O-18 seawater record suggests that Western Indian Ocean upwelling uncouples from the Indian Ocean Dipole during the global-warming hiatus.SCIENTIFIC REPORTS,9.
MLA	Watanabe, Takaaki K.,et al."Oman coral delta O-18 seawater record suggests that Western Indian Ocean upwelling uncouples from the Indian Ocean Dipole during the global-warming hiatus".SCIENTIFIC REPORTS 9(2019).