Arid
DOI10.1016/j.marmicro.2011.01.004
Paleoceanography of the Mauritanian margin during the last two climatic cycles: From planktonic foraminifera to African climate dynamics
Matsuzaki, K. M. R.1; Eynaud, F.1; Malaize, B.1; Grousset, F. E.1,2; Tisserand, A.1; Rossignol, L.1; Charlier, K.1; Jullien, E.1
通讯作者Eynaud, F.
来源期刊MARINE MICROPALEONTOLOGY
ISSN0377-8398
EISSN1872-6186
出版年2011
卷号79期号:3-4页码:67-79
英文摘要

The last 220 ka of the MD03-2705 (18 degrees 05.81’ N-21 degrees 09.19’ W) sedimentary sequence, retrieved off the Cape Verde islands, was investigated using a multiproxy approach. Planktonic foraminifera assemblage analyses, coupled with isotopic measurements (delta O-18) from benthic (Planulina wuellerstorfi) and planktonic (Globigerinoides ruber) foraminifera monospecific samples were conducted along the topmost 11 m of the sequence. High resolution X-ray fluorescence measurements (0.5 cm resolution), giving access to major element ratio, have completed the geochemical analyses along the core. Seasonal and annual past sea surface temperatures (SST) were quantitatively reconstructed. Local sea-surface salinity (SSS) changes were then estimated by coupling SST with planktonic delta O-18 data. Our data provide a set of both oceanic and continental markers of environmental changes along the north-western African margin. The major changes detected in our record are discussed in the light of the regional paleoceanographic and paleoclimatic history of the last 220 ka. Coupled oceanographic and atmospheric processes portray the climatic evolution of the area, and show strong links among the regional oceanography (water mass advection), the upwelling dynamics and the Intertropical Convergence Zone (ITCZ) migration. An increased upwelling activity (or influence of upwelling filaments) is noted at the end of the two last glacial periods, probably in response to a more southerly position of the ITCZ. Higher SSS are recorded over the area during arid intervals and were tentatively interpreted as signing a southward shift of the Cape Verde Frontal Zone. A detailed coupling between dust advection and SSS values over the site of study was noted during MIS6.5. (C) 2011 Elsevier B.V. All rights reserved.


英文关键词NW African margin Planktonic foraminifera Sea-surface salinity African monsoons Late Pleistocene
类型Article
语种英语
国家France
收录类别SCI-E
WOS记录号WOS:000291415700001
WOS关键词SEA-SURFACE TEMPERATURES ; NORTHWEST AFRICA ; CANARY-ISLANDS ; ISOTOPIC COMPOSITION ; OCEAN PRODUCTIVITY ; CONTINENTAL-MARGIN ; NORTHEAST ATLANTIC ; WATER TEMPERATURE ; DEEP-SEA ; PALEOSALINITY
WOS类目Paleontology
WOS研究方向Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/169620
作者单位1.Univ Bordeaux 1, Lab EPOC UMR CNRS 5805, F-33405 Talence, France;
2.Observ Aquitain Sci Univers, Floirac, France
推荐引用方式
GB/T 7714
Matsuzaki, K. M. R.,Eynaud, F.,Malaize, B.,et al. Paleoceanography of the Mauritanian margin during the last two climatic cycles: From planktonic foraminifera to African climate dynamics[J],2011,79(3-4):67-79.
APA Matsuzaki, K. M. R..,Eynaud, F..,Malaize, B..,Grousset, F. E..,Tisserand, A..,...&Jullien, E..(2011).Paleoceanography of the Mauritanian margin during the last two climatic cycles: From planktonic foraminifera to African climate dynamics.MARINE MICROPALEONTOLOGY,79(3-4),67-79.
MLA Matsuzaki, K. M. R.,et al."Paleoceanography of the Mauritanian margin during the last two climatic cycles: From planktonic foraminifera to African climate dynamics".MARINE MICROPALEONTOLOGY 79.3-4(2011):67-79.
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