气候变化领域集成服务门户(CCPortal): The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin

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DOI	10.1016/j.quascirev.2019.106139
	The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin
	Ausín B.; Hodell D.A.; Cutmore A.; Eglinton T.I.
发表日期	2020
ISSN	0277-3791
卷号	230
英文摘要	This study combines high-resolution records of nannofossil abundances, oxygen and carbon stable isotopes, core scanning X-ray fluorescence (XRF), and ice rafted debris (IRD) to assess the paleoceanographic changes that occurred during the last deglaciation on the SW Iberian Margin. Our results reveal parallel centennial-scale oscillations in coccolithophore productivity, nutricline depth and upwelling phenomena not previously observed, explained by means of arrival of iceberg-melting waters, iceberg-induced turbulent conditions, SST changes and riverine discharges. On millennial time-scales, higher primary productivity (PP), shallower nutricline, and upwelling occurrence/invigoration are observed for the Last Glacial Maximum (LGM) and Bølling-Allerød (B/A). The opposite scenario (i.e., lower productivity, deeper nutricline and upwelling weakening/absence) is linked to cold spells such as Heinrich Stadials 2 and 1 (HS2 and HS1) and the Younger Dryas (YD). Such paleoproductivity variations are attributed to latitudinal migrations of the thermal fronts associated with oceanic gyres in the North Atlantic, in parallel to oscillations in the strength of the Atlantic Meridional Overturning Circulation (AMOC). Moderate-to-high PP during the Holocene is ascribed to the development of the modern seasonal surface hydrography, with a more persistent Iberian Poleward Current (IPC) and seasonal wind-induced upwelling. © 2019 The Authors
英文关键词	AMOC; Deglaciation; Heinrich stadials; Holocene; IRD; Nannofossils; North Atlantic; Paleoceanography; Stable isotopes
语种	英语
scopus关键词	Isotopes; Sea ice; AMOC; Deglaciations; Heinrich stadials; Holocenes; Nannofossils; North Atlantic; Paleoceanography; Stable isotopes; Oceanography
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151602
作者单位	Geological Institute, ETH Zürich, Zurich, 8092, Switzerland; Department of Geology, University of Salamanca, Salamanca, 37008, Spain; Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, United Kingdom; Department of Geography, University College London, London, WC1E 6BT, United Kingdom
推荐引用方式 GB/T 7714	Ausín B.,Hodell D.A.,Cutmore A.,et al. The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin[J],2020,230.
APA	Ausín B.,Hodell D.A.,Cutmore A.,&Eglinton T.I..(2020).The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin.Quaternary Science Reviews,230.
MLA	Ausín B.,et al."The impact of abrupt deglacial climate variability on productivity and upwelling on the southwestern Iberian margin".Quaternary Science Reviews 230(2020).