DOI: 10.1016/j.quascirev.2012.12.018
Scopus记录号: 2-s2.0-84885954433
论文题名: Quaternary history of sea ice in the western Arctic Ocean based on foraminifera
作者: Polyak L. ; Best K.M. ; Crawford K.A. ; Council E.A. ; St-Onge G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 79 起始页码: 145
结束页码: 156
语种: 英语
英文关键词: Foraminifers
; Mid-Pleistocene Transition
; Quaternary
; Sea ice history
; Western Arctic Ocean
Scopus关键词: Arctic ocean
; Bulk chemical composition
; Foraminiferal assemblages
; Foraminifers
; Laurentide ice sheets
; Mid-Pleistocene Transition
; Northern Hemispheres
; Quaternary
; Glacial geology
; Oceanography
; Stratigraphy
; Sea ice
; chemical composition
; cooling
; foraminifera
; ice sheet
; Laurentide Ice Sheet
; microfossil
; paleoceanography
; Quaternary
; sea ice
; sediment core
; Arctic Ocean
; Northwind Ridge
; Foraminifera
英文摘要: Sediment cores from the Northwind Ridge, western Arctic Ocean, including uniquely preserved calcareous microfossils, provide the first continuous proxy record of sea ice in the Arctic Ocean encompassing more than half of the Quaternary. The cores were investigated for foraminiferal assemblages along with coarse grain size and bulk chemical composition. By combination of glacial cycles and unique events reflected in the stratigraphy, the age of the foraminiferal record was estimated as ca 1.5Ma. Foraminiferal abundances, diversity, and composition of benthic assemblages, especially phytodetritus and polar species, were used as proxies for sea-ice conditions. Foraminiferal Assemblage Zone 2 in the Lower Pleistocene indicates diminished, mostly seasonal sea ice, probably facilitated by enhanced inflow of Pacific waters. A gradual decrease in ice-free season with episodes of abrupt ice expansion is interpreted for the Mid-Pleistocene Transition, consistent with climatic cooling and ice-sheet growth in the Northern Hemisphere. A principal faunal and sedimentary turnover occurred near the Early-Middle Pleistocene boundary ca 0.75Ma, with mostly perennial sea ice indicated by the overlying Assemblage Zone 1. Two steps of further increase in sea-ice coverage are inferred from foraminiferal assemblage changes in the "Glacial" Pleistocene by ca 0.4 and 0.24Ma, possibly related to hemispheric (Mid-Brunhes Event) and Laurentide ice sheet growth, respectively. These results suggest that year-round ice in the western Arctic was a norm for the last several 100ka, in contrast to rapidly disappearing summer ice today. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60480
Appears in Collections: 过去全球变化的重建
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作者单位: Byrd Polar Research Center, The Ohio State University, 1090 Carmack Road, Columbus, OH 43210, United States; School of Earth Sciences, The Ohio State University, Columbus, OH 43210, United States; Department of Geological Sciences, Wright State University, Dayton, OH 45435, United States; Institut des sciences de la mer de Rimouski (ISMER), Rimouski, QC G5L 3A1, Canada; GEOTOP Research Center, QC, Canada
Recommended Citation:
Polyak L.,Best K.M.,Crawford K.A.,et al. Quaternary history of sea ice in the western Arctic Ocean based on foraminifera[J]. Quaternary Science Reviews,2013-01-01,79