DOI: 10.1016/j.quascirev.2016.09.011
Scopus记录号: 2-s2.0-84988663072
论文题名: Norwegian Sea warm pulses during Dansgaard-Oeschger stadials: Zooming in on these anomalies over the 35–41 ka cal BP interval and their impacts on proximal European ice-sheet dynamics
作者: Wary M. ; Eynaud F. ; Rossignol L. ; Lapuyade J. ; Gasparotto M.-C. ; Londeix L. ; Malaizé B. ; Castére M.-H. ; Charlier K.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 151 起始页码: 255
结束页码: 272
语种: 英语
英文关键词: Dansgaard-Oeschger events
; Heinrich events
; High resolution multiproxy approach
; Sea ice
; Surface/subsurface hydrological conditions
; Trigger mechanism
Scopus关键词: Climate change
; Glaciers
; Saline water
; Sea ice
; Surface waters
; Dansgaard-oeschger events
; Heinrich Events
; Hydrological condition
; Multiproxy approach
; Trigger mechanism
; Ice
; air-sea interaction
; Dansgaard-Oeschger cycle
; halocline
; Heinrich event
; ice sheet
; iceberg
; iceberg calving
; Last Glacial
; paleoceanography
; sea ice
; sea surface
; sea surface temperature
; trigger mechanism
; upper ocean
; water column
; Arctic
; Arctic Ocean
; Atlantic Ocean
; Greenland
; Greenland Ice Sheet
; Norwegian Sea
英文摘要: The last glacial millennial climatic events (i.e. Dansgaard-Oeschger and Heinrich events) constitute outstanding case studies of coupled atmosphere-ocean-cryosphere interactions. Here, we investigate the evolution of sea-surface and subsurface conditions, in terms of temperature, salinity and sea ice cover, at very high-resolution (mean resolution between 55 and 155 years depending on proxies) during the 35–41 ka cal BP interval covering three Dansgaard-Oeschger cycles and including Heinrich event 4, in a new unpublished marine record, i.e. the MD99-2285 core (62.69°N; -3.57s°E). We use a large panel of complementary tools, which notably includes dinocyst-derived sea-ice cover duration quantifications. The high temporal resolution and multiproxy approach of this work allows us to identify the sequence of processes and to assess ocean-cryosphere interactions occurring during these periodic ice-sheet collapse events. Our results evidence a paradoxical hydrological scheme where (i) Greenland interstadials are marked by a homogeneous and cold upper water column, with intensive winter sea ice formation and summer sea ice melting, and (ii) Greenland and Heinrich stadials are characterized by a very warm and low saline surface layer with iceberg calving and reduced sea ice formation, separated by a strong halocline from a less warm and saltier subsurface layer. Our work also suggests that this stadial surface/subsurface warming started before massive iceberg release, in relation with warm Atlantic water advection. These findings thus support the theory that upper ocean warming might have triggered European ice-sheet destabilization. Besides, previous paleoceanographic studies conducted along the Atlantic inflow pathways close to the edge of European ice-sheets suggest that such a feature might have occurred in this whole area. Nonetheless, additional high resolution paleoreconstructions are required to confirm such a regional scheme. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59411
Appears in Collections: 过去全球变化的重建
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作者单位: UMR 5805, EPOC (Environnements et Paléoenvironnements Océaniques et Continentaux), Université de Bordeaux, Pessac, France; UQAM, Université du Québec à Montréal, Montréal, Québec, Canada
Recommended Citation:
Wary M.,Eynaud F.,Rossignol L.,et al. Norwegian Sea warm pulses during Dansgaard-Oeschger stadials: Zooming in on these anomalies over the 35–41 ka cal BP interval and their impacts on proximal European ice-sheet dynamics[J]. Quaternary Science Reviews,2016-01-01,151