DOI: 10.1016/j.quascirev.2015.10.035
Scopus记录号: 2-s2.0-84989927735
论文题名: Variations in glacial and interglacial marine conditions over the last two glacial cycles off northern Greenland
作者: Löwemark L. ; Chao W.-S. ; Gyllencreutz R. ; Hanebuth T.J.J. ; Chiu P.-Y. ; Yang T.-N. ; Su C.-C. ; Chuang C.-K. ; León Dominguez D.C. ; Jakobsson M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 147 起始页码: 164
结束页码: 177
语种: 英语
英文关键词: Arctic Ocean
; Bioturbation
; Glacial
; Interglacial
; Manganese
; Sea ice
Scopus关键词: Glacial geology
; Manganese
; Photosynthesis
; Phytoplankton
; Sea ice
; Sedimentology
; Sediments
; Arctic ocean
; Bioturbation
; Depositional condition
; Glacial
; Interglacial
; Interglacial sediments
; Marine isotope stages
; Planktonic foraminifera
; Ice
; Foraminifera
英文摘要: Five sediment cores from the Lomonosov Ridge and the Morris Jesup Rise north of Greenland show the history of sea-ice coverage and primary productivity over the last two glacial cycles. Variations in Manganese content, benthic and planktonic foraminifera, bioturbation, and trace fossil diversity are interpreted to reflect differences in sea-ice cover and sediment depositional conditions between the identified interglacials. Marine Isotope Stage (MIS) 1 and MIS 2 are represented by thin (<<5 cm) sediment units while the preceding interglacial MIS 5 and glacial MIS 6 are characterized by thick (10–20 cm) deposits. Foraminiferal abundances and bioturbation suggest that MIS 1 was generally characterized by severe sea-ice conditions north of Greenland while MIS 5 appears to have been considerably warmer with more open water, higher primary productivity, and higher sedimentation rates. Strengthened flow of Atlantic water along the northern continental shelf of Greenland rather than development of local polynyas is here suggested as a likely cause for the relatively warmer marine conditions during MIS 5 compared to MIS 1. The cores also suggest distinct differences between the glacial intervals MIS 2 and MIS 6. While MIS 6 is distinguished by a relatively thick sediment unit poor in foraminifera and with low Mn values, MIS 2 is practically missing. We speculate that this could be the effect from a paleocrystic sea-ice cover north of Greenland during MIS 2 that prevented sediment delivery from sea ice and icebergs. In contrast, the thick sequence deposited during MIS 6 indicates a longer glacial period with dynamic intervals characterized by huge drifting icebergs delivering ice rafted debris (IRD). A drastic shift from thinner sedimentary cycles where interglacial sediment parameters indicate more severe sea-ice conditions gave way to larger amplitude cycles with more open water indicators was observed around the boundary between MIS 7/8. This shift is in agreement with a sedimentary regime shift previously identified in the Eurasian Basin and may be an indicator for the growth of larger ice sheets on the Eurasian landmass during the penultimate glacial period. © 2015 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59512
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geosciences, National Taiwan University, P.O. Box 13-318, Taipei, Taiwan; Department of Geological Sciences, Stockholm University, Stockholm, Sweden; School of Coastal and Marine Systems Science, Coastal Carolina University, Conway, SC, United States; CPC Corporation, Taiwan; Institute of Oceanography, National Taiwan University, Taipei, Taiwan; Instituto Politécnico Nacional, Escuela Superior de ingenieria y arquitectura (ESIA) Ticomán, Ciencias de la Tierra, Mexico
Recommended Citation:
Löwemark L.,Chao W.-S.,Gyllencreutz R.,et al. Variations in glacial and interglacial marine conditions over the last two glacial cycles off northern Greenland[J]. Quaternary Science Reviews,2016-01-01,147