DOI: 10.1016/j.gloplacha.2015.10.001
论文题名: Geochemical evidence for intermediate water circulation in the westernmost Mediterranean over the last 20kyrBP and its impact on the Mediterranean Outflow
作者: Jiménez-Espejo F.J. ; Pardos-Gené M. ; Martínez-Ruiz F. ; García-Alix A. ; van de Flierdt T. ; Toyofuku T. ; Bahr A. ; Kreissig K.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2015
卷: 135 起始页码: 38
结束页码: 46
语种: 英语
英文关键词: Alboran basin
; Last glacial cycle
; Levantine intermediate water
; Mediterranean outflow
; Nd isotopes
; Redox conditions
Scopus关键词: Glacial geology
; Isotopes
; Oceanography
; Submarine geology
; Uranium
; Alboran basin
; Last glacial cycles
; Levantine intermediate waters
; Mediterranean Outflow
; Nd isotopes
; Redox condition
; Neodymium
英文摘要: The Mediterranean Outflow (MOW) is generated by deep and intermediate waters from different basins in the Mediterranean Sea. Despite the number of studies on Mediterranean water masses, little work has been done on the source and properties of intermediate waters in the westernmost Mediterranean Sea and their links with MOW. Here we examine three marine sediment records spanning the last 20 kyr, located at key depths to trace intermediate waters along the Alboran Sea. We use a combination of redox-sensitive elements, which can serve as proxies to reconstruct variations in the water column oxygenation and the Nd isotopic composition of foraminiferal ferromanganese coatings, in order to reconstruct water mass provenance of Eastern/Western Mediterranean waters. As measured, εNd<-9.2 and a low U/Th ratio during glacial periods can be attributed to the presence of Western Mediterranean Deep Water (WMDW) at the study sites. During deglaciation, higher Nd isotopic compositions and U/Th ratios point to an enhanced contribution of the modified Levantine Intermediate Water (LIW). The comparison between our data and other LIW and MOW records suggests that i) the lower branch of MOW is linked to WMDW during the glacial period, ii) the middle MOW branch follows LIW activity during deglaciation, while iii) the upper branch is more active during late Holocene, coinciding with LIW formation increase after sapropel deposits. This reconstruction has significant implications for an understanding of the MOW evolution. © 2015 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954368604&doi=10.1016%2fj.gloplacha.2015.10.001&partnerID=40&md5=d70fedd8cc6a7ba51f84b2d8ee606858
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11458
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Department of Biogeochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
Recommended Citation:
Jiménez-Espejo F.J.,Pardos-Gené M.,Martínez-Ruiz F.,et al. Geochemical evidence for intermediate water circulation in the westernmost Mediterranean over the last 20kyrBP and its impact on the Mediterranean Outflow[J]. Global and Planetary Change,2015-01-01,135.