globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2011.05.049
论文题名:
A high resolution opal and radiolarian record from the subpolar North Atlantic during the Mid-Pleistocene Transition (1069-779ka): Palaeoceanographic implications
作者: Hernández-Almeida I.; Bjørklund K.R.; Sierro F.J.; Filippelli G.M.; Cacho I.; Flores J.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 391
起始页码: 49
结束页码: 70
语种: 英语
英文关键词: Biogenic opal ; Melt-water discharge ; North Atlantic ; Ocean circulation ; Productivity ; Radiolarian
英文摘要: A high-resolution record of radiolarian assemblages from Site U1314 was studied to reconstruct hydrographic and climatic changes in the North Atlantic Ocean during the Mid-Pleistocene Transition period (1069-779. ka). Besides the faunal record, absolute accumulation of radiolarians and total biogenic opal are used to determine changes in surface water productivity. Results show that the North Atlantic Arctic Front shifted back and forth repeatedly at a glacial/interglacial timescale, bringing the site under the influence of both cold Arctic (glacial), and much warmer Atlantic (interglacial) waters. During glacial intervals and "ice-rafted debris" (IRD) events, the deep-dwelling taxon Cycladophora davisiana was the greatest contributor of the radiolarian assemblage, suggesting cold surface conditions, melt-water discharge and changes in deep and intermediate circulation. Interglacial intervals were characterized by abundant shallow-dwelling taxa like Pseudodyctiophimus gracilipes and Lithomelissa setosa, increased opal accumulation, and higher radiolarian diversities, indicating a northward flow of warm Atlantic surface waters to the Site U1314 area. A marked change in the structure of the radiolarian assemblage occurred after MIS 22 (~. 860. ka), with large taxa differences between warm and cold periods, probably in response to changing ocean conditions due to the higher amplitude of glacial/interglacial changes as the dominant periodicity of high-latitude climate oscillations shifted from 41-kyr to 100-kyr. Thus, we conclude that the radiolarian assemblage from the North Atlantic have changed drastically along with variations in ocean circulation in response to orbital and millennial-scale climatic variations that occurred in the Early and Mid-Pleistocene. © 2011 Elsevier B.V.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69569
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: Department of Geology, University of Salamanca, 37008 Salamanca, Spain; Natural History Museum of Oslo, University of Oslo, 0562 Oslo, Norway; Department of Earth Sciences, Indiana University-Purdue University Indianapolis (IUPUI). 46202, Indianapolis, United States; GRC Marine Geosciences, Department of Stratigraphy, Paleontology and Marine Geosciences, University of Barcelona, 08028 Barcelona, Spain

Recommended Citation:
Hernández-Almeida I.,Bjørklund K.R.,Sierro F.J.,et al. A high resolution opal and radiolarian record from the subpolar North Atlantic during the Mid-Pleistocene Transition (1069-779ka): Palaeoceanographic implications[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,391
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Hernández-Almeida I.]'s Articles
[Bjørklund K.R.]'s Articles
[Sierro F.J.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Hernández-Almeida I.]'s Articles
[Bjørklund K.R.]'s Articles
[Sierro F.J.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Hernández-Almeida I.]‘s Articles
[Bjørklund K.R.]‘s Articles
[Sierro F.J.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.