气候变化领域集成服务门户(CCPortal): Coccolithophore productivity at the western Iberian Margin during the Middle Pleistocene (310-455 ka)-evidence from coccolith Srĝ•Ca data

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DOI	10.5194/cp-16-2017-2020
	Coccolithophore productivity at the western Iberian Margin during the Middle Pleistocene (310-455 ka)-evidence from coccolith Srĝ•Ca data
	Cavaleiro C.; H. L. Voelker A.; Stoll H.; Baumann K.H.; Kucera M.
发表日期	2020
ISSN	18149324
起始页码	2017
结束页码	2037
卷号	16 期号:6
英文摘要	Coccolithophores contribute significantly to marine primary productivity and play a unique role in ocean biogeochemistry by using carbon for photosynthesis (soft-Tissue pump) and for calcification (carbonate counter pump). Despite the importance of including coccolithophores in Earth system models to allow better predictions of the climate system s responses to planetary change, the reconstruction of coccolithophore productivity mostly relied on proxies dependent on accumulation and sedimentation rates and preservation conditions. In this study we used an independent proxy, based on the coccolith fraction (CF) Sr=Ca ratio, to reconstruct coccolithophore productivity. We studied the marine sediment core MD03-2699 from the western Iberian margin (IbM), concentrating on glacial interglacial cycles of Marine Isotopic Stage (MIS) 12 to MIS 9. We found that IbM coccolithophore productivity was controlled by changes in the oceanographic conditions, such as in sea surface temperature (SST) and nutrient availability, and by competition with other phytoplankton groups. Long-Term coccolithophore productivity was primarily affected by variations in the dominant surface water mass. Polar and subpolar surface waters during glacial substages were associated with decreased coccolithophore productivity, with the strongest productivity minima concomitant with Heinrich-Type events (HtEs). Subtropical, nutrient-poorer waters, increased terrigenous input, and moderate to strong upwelling during the deglaciation and early MIS11 are hypothesized to have attributed a competitive advantage to diatoms to the detriment of coccolithophores, resulting in intermediate coccolithophore productivity levels. During the progression towards full glacial conditions an increasing presence of nutrient-richer waters, related to the growing influence of transitional surface waters and/or intensified upwelling, probably stimulated coccolithophore productivity to maxima following the rapid depletion of silica by diatoms. We present conceptual models of the carbon and carbonate cycle components for the IbM in different time slices that might serve as a basis for further investigation and modelling experiments. © 2020 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	biogeochemistry; calcification; coccolith; geoaccumulation; marine isotope stage; nutrient availability; photosynthesis; phytoplankton; primary production; reconstruction; sea surface temperature; Atlantic Ocean; Iberian Margin; Bacillariophyta; Haptophyceae
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146656
作者单位	University of Bremen, MARUM-Center for Marine and Environmental Sciences, Leobener Straße 8, Bremen, 28359, Germany; IPMA-Instituto Português Do Mar e da Atmosfera, Divisão de Geologia Marinha e Georecursos Marinhos, Avenida Doutor Alfredo Magalhães Ramalho 6, Algés, 1495-165, Portugal; Ccmar, Centro de Ciências Do Mar, Universidade Do Algarve, Campus de Gambelas, Faro, 8005-139, Portugal; Geology Department, University of Oviedo, C/. Jesús Arias de Velasco s/n, Oviedo, 33005, Spain; University of Bremen, Geosciences Department, Klagenfurter Straße 2-4, Bremen, 28359, Germany; Department of Earth Sciences, Eth Zürich, Sonneggstrasse 5, Zürich, 8092, Switzerland
推荐引用方式 GB/T 7714	Cavaleiro C.,H. L. Voelker A.,Stoll H.,等. Coccolithophore productivity at the western Iberian Margin during the Middle Pleistocene (310-455 ka)-evidence from coccolith Srĝ•Ca data[J],2020,16(6).
APA	Cavaleiro C.,H. L. Voelker A.,Stoll H.,Baumann K.H.,&Kucera M..(2020).Coccolithophore productivity at the western Iberian Margin during the Middle Pleistocene (310-455 ka)-evidence from coccolith Srĝ•Ca data.Climate of the Past,16(6).
MLA	Cavaleiro C.,et al."Coccolithophore productivity at the western Iberian Margin during the Middle Pleistocene (310-455 ka)-evidence from coccolith Srĝ•Ca data".Climate of the Past 16.6(2020).