DOI: 10.1016/j.quascirev.2015.10.006
Scopus记录号: 2-s2.0-84944901656
论文题名: The deglaciation over Laurentian Fan: History of diatoms, IRD, ice and fresh water
作者: Gil I.M. ; Keigwin L.D. ; Abrantes F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 129 起始页码: 57
结束页码: 67
语种: 英语
英文关键词: Bølling-Allerød
; Deglaciation
; Diatom
; Heinrich event 1
; North atlantic
; Older Dryas
; Preboreal
; Sea-ice
; Younger Dryas
Scopus关键词: Algae
; Glacial geology
; Heat flux
; Melting
; Phytoplankton
; Sea ice
; Water
; Deglaciations
; Diatom
; Heinrich Events
; North Atlantic
; Older Dryas
; Preboreal
; Younger Dryas
; Ice
; Bacillariophyta
英文摘要: A high-resolution diatom census coupled with other proxy data from Laurentian Fan (LF) provides a detailed description of the last deglaciation, bringing new insight to that period by revealing directly the timing of sea-ice formation and melting. Cold events Heinrich Event 1 (H1) and the Younger Dryas (YD) were multiphase events. H1 (~16.8-15.7 cal kyr BP) was defined by a two-pulse release of icebergs promoting sea-ice formation. Melting of sea-ice after H1 corresponds to a cold and fresh anomaly that may have kept the Bølling colder than the Allerød. At ~13.6 cal kyr BP, a cooling trend culminated with sea-ice formation, marking the YD onset (~12.8 cal kyr BP). The decrease in sea-ice (~12.2 cal kyr BP) led to a YD second phase characterized by very cold winters. However, the contribution of warm water diatoms tends to increase at the same time and the YD gradual end (~11.6 cal kyr BP) contrasts with its abrupt end in Greenland ice cores. The YD cannot be regarded as an event triggered by a fresh water input through the Laurentian Channel since only one weak brief input nearly 1000 yrs after its onset is recorded. Very cold and cool conditions without ice mark the following Preboreal. A northward heat flux between 10.8 and 10.2 cal kyr BP was interrupted by the increased influence of coastal waters likely fed by inland melting. There was no further development of sea-ice or ice-drift then. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59768
Appears in Collections: 过去全球变化的重建
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作者单位: IPMA - Portuguese Institute for the Ocean and Atmosphere, Marine Geology and Geo-resources Division, Rua Alfredo Magalhães Ramalho, 6, Lisboa, Portugal; CCMAR - Centre of Marine Sciences, Campus de Gambelas, Faro, Portugal; WHOI - Woods Hole Oceanographic Institution, Geology and Geophysics, 266 Woods Hole Rd. - MS# 08, Woods Hole, MA, United States
Recommended Citation:
Gil I.M.,Keigwin L.D.,Abrantes F.. The deglaciation over Laurentian Fan: History of diatoms, IRD, ice and fresh water[J]. Quaternary Science Reviews,2015-01-01,129