DOI: 10.1016/j.gloplacha.2015.11.006
论文题名: Climate changes in south western Iberia and Mediterranean Outflow variations during two contrasting cycles of the last 1 Myrs: MIS 31-MIS 30 and MIS 12-MIS 11
作者: Sánchez Goñi M.F. ; Llave E. ; Oliveira D. ; Naughton F. ; Desprat S. ; Ducassou E. ; Hodell D.A. ; Hernández-Molina F.J.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 136 起始页码: 18
结束页码: 29
语种: 英语
英文关键词: Climate
; Grain-size
; Mediterranean Outflow Water
; MIS 12-MIS 11
; MIS 31-MIS 30
; Pollen
; South western Iberia
; Vegetation
Scopus关键词: Climate change
; Deposition
; Grain size and shape
; Stratigraphy
; Vegetation
; Climate
; Grain size
; Mediterranean outflow waters
; Pollen
; Western iberia
; C (programming language)
; aridification
; benthos
; bottom current
; climate change
; comparative study
; depositional environment
; global change
; grain size
; interglacial
; Mediterranean environment
; meridional circulation
; Ocean Drilling Program
; outflow
; pollen
; tracer
; Atlantic Ocean
; Atlantic Ocean (North)
; Gulf of Cadiz
; Iberian Peninsula
; Foraminifera
英文摘要: Grain size analysis and physical properties of Sites U1388, U1389 and U1390 collected in the Contourite Depositional System of the Gulf of Cádiz during the Integrated Ocean Drilling Program (IODP) Expedition 339 "Mediterranean Outflow" reveal relative changes in bottom current strength, a tracer of the dynamics of the Mediterranean Outflow Water (MOW), before and after the Middle Pleistocene Transition (MPT). The comparison of MOW behavior with climate changes identified by the pollen analysis and δ18O benthic foraminifera measurements of Site U1385, the Shackleton Site, collected in the south western Iberian margin shows that the interval MIS 31-MIS 30, ∼1.1-1.05millionyears ago (Ma), before the MPT, was marked by wetter climate and weaker bottom current than the interval MIS 12-MIS 11 (0.47-0.39Ma), after the MPT. Similarly, the increase in fine particles from these glacials to interglacials and in coarse fraction from interglacials to glacials was coeval with forest and semi-desert expansions, respectively, indicating the lowering/enhancement of MOW strength during periods of regional increase/decrease of moisture. While these findings may not necessarily apply to all glacial/interglacial cycles, they nonetheless serve as excellent supporting examples of the hypothesis that aridification can serve as a good tracer for MOW intensity. The strongest regional aridity during MIS 12 coincides with a remarkable increase of coarse grain size deposition and distribution that we interpret as a maximum in MOW strength. This MOW intensification may have pre-conditioned the North Atlantic by increasing salinity, thereby triggering the strong resumption of the Meridional Overturning Circulation that could contribute to the great warmth that characterizes the MIS 11c super-interglacial. © 2015 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948808224&doi=10.1016%2fj.gloplacha.2015.11.006&partnerID=40&md5=08262f013845f07a566695edc3550779
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11725
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: Ecole Pratique des Hautes Etudes (EPHE), UMR CNRS 5805 EPOC, Université de Bordeaux, Allée Geoffroy St Hilaire, Pessac, France
Recommended Citation:
Sánchez Goñi M.F.,Llave E.,Oliveira D.,et al. Climate changes in south western Iberia and Mediterranean Outflow variations during two contrasting cycles of the last 1 Myrs: MIS 31-MIS 30 and MIS 12-MIS 11[J]. Global and Planetary Change,2016-01-01,136.