DOI: 10.1016/j.quascirev.2014.09.001
Scopus记录号: 2-s2.0-85027957013
论文题名: Past circulation along the western Iberian margin: A time slice vision from the Last Glacial to the Holocene
作者: Salgueiro E. ; Naughton F. ; Voelker A.H.L. ; de Abreu L. ; Alberto A. ; Rossignol L. ; Duprat J. ; Magalhães V.H. ; Vaqueiro S. ; Turon J.-L. ; Abrantes F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 106 起始页码: 316
结束页码: 329
语种: 英语
英文关键词: Heinrich stadial
; Iberian margin
; Last Glacial Maximum
; Paleoproductivity
; Paleotemperature
; Planktonic foraminifera
; Younger Dryas
Scopus关键词: Atmospheric temperature
; Coastal engineering
; Glacial geology
; Productivity
; Sea ice
; Sea level
; Surface waters
; Heinrich stadial
; Iberian margin
; Last Glacial Maximum
; Paleoproductivity
; Paleotemperatures
; Planktonic foraminifera
; Younger Dryas
; Oceanography
; advection
; circulation
; displacement
; Heinrich event
; Holocene
; Last Glacial Maximum
; latitudinal gradient
; paleoproductivity
; planktonic foraminifera
; sea surface temperature
; sediment core
; spatiotemporal analysis
; upwelling
; Younger Dryas
; Azores
; Iberian Peninsula
; Portugal
; Foraminifera
英文摘要: Fifteen Iberian margin sediment cores, distributed between 43°12'N and 35°53'N, have been used to reconstruct spatial and temporal (sub)surface circulation along the Iberian margin since the Last Glacial period. Time-slice maps of planktonic foraminiferal derived summer sea surface temperature (SST) and export productivity (Pexp) were established for specific time intervals within the last 35ky: the Holocene (Recent and last 8ky), Younger Dryas (YD), Heinrich Stadials (HS) 1, 2a, 2b, 3, and the Last Glacial Maximum (LGM). The SST during the Holocene shows the same latitudinal gradient along the western Iberian margin as present-day with cold but productive areas that reflect the influence of coastal upwelling centers. The LGM appears as a slightly less warm, but more productive period relative to the Holocene and present-day conditions, suggesting that sea-level minima forced a westward displacement of the coastal upwelling centers possibly accompanied by a strengthening of northward winds. During the YD, a longitudinal thermal front is depicted at 10°W, with cold polar waters offshore and warmer subtropical waters inshore, suggesting that the subtropical Paleo-Iberian Poleward Current more likely flowed at a more inshore location masking the local SST signal and amplitude of variation. A substantial cooling and drop in productivity is observed during all HS, in particular HS1 and HS3, reflecting the penetration of icebergs-derived meltwater. These most extreme southward extensions of very cold waters define a strong SST gradient that marks a possible Paleo-Azores Front. Higher production south of this front was likely fed by frontal nutrient advection. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60105
Appears in Collections: 过去全球变化的重建
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作者单位: Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Lisboa, Portugal; CIMAR Associate Laboratory, CIIMAR, Porto, Portugal; IPMA Collaborator, Portugal; Instituto Dom Luiz (LA), Portugal; UMR-CNRS 5805 EPOC, Université de Bordeaux, Allée Geoffroy St Hilaire, Pessac, France
Recommended Citation:
Salgueiro E.,Naughton F.,Voelker A.H.L.,et al. Past circulation along the western Iberian margin: A time slice vision from the Last Glacial to the Holocene[J]. Quaternary Science Reviews,2014-01-01,106