DOI: 10.1016/j.quascirev.2018.06.030
Scopus记录号: 2-s2.0-85050141725
论文题名: Paleoceanography of northeastern Fram Strait since the last glacial maximum: Palynological evidence of large amplitude changes
作者: Falardeau J. ; de Vernal A. ; Spielhagen R.F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 195 起始页码: 133
结束页码: 152
语种: 英语
英文关键词: Dinocysts
; Fram strait
; Holocene
; Last glacial maximum (LGM)
; Late and post-glacial
; Salinity
; Sea ice
; Temperature
Scopus关键词: Ferroelectric RAM
; Glacial geology
; Oceanography
; Sea ice
; Temperature
; Dinocysts
; Fram strait
; Holocenes
; Last Glacial Maximum
; Late and post-glacial
; Salinity
; Surface waters
; amplitude
; community structure
; cyst
; deglaciation
; glacial erosion
; Holocene
; Last Glacial Maximum
; paleoceanography
; palynology
; salinity
; sea ice
; sea surface temperature
; Arctic
; Fram Strait
; Svalbard
; Svalbard and Jan Mayen
英文摘要: Sea-surface conditions in northeastern Fram Strait since the last glacial maximum (LGM) were reconstructed from cores MSM5/5-712-2 and PS2863/1–2 based on palynological assemblages, ecological preferences of dinocysts and application of the modern analog technique. Dinocyst in LGM sediments are sparse, but their assemblages reflect mild summer conditions. Given the regional context and evidence from other tracers, the dinocyst assemblages of the LGM could relate to regional fluxes of dinocysts during exceptional mild summers. From 19 to 14.7 ka, dinocyst data suggest very cold conditions with extensive sea-ice cover, while abundant reworked palynomorphs indicate intense glacial erosion. An abrupt transition at 14.7–14.5 ka was marked by a peak in summer temperatures coinciding with a rapidly deposited sediment layer related to a regional meltwater plume event in western Svalbard. From 14.7 to 12.6 ka, large seasonal temperature contrasts with mild summers and cold winters together with low salinity indicate continuous melting of the Svalbard Barents Sea ice sheet fostered by warm climate. At 12.6 ka, the regional onset of the Younger Dryas was marked by cooling and increased salinity. On a regional scale, the 12.6–12 ka interval corresponds to an important transition involving enhanced circulation of Arctic waters around Svalbard and establishment of coastal fronts along its northern and western margins. Modern-like oceanic conditions with relatively high salinity and low seasonal temperature contrast developed at about 7.6 ka. Since then, a slight cooling is observed, especially in winter. This study offers a comprehensive picture of the deglacial phases in eastern Fram Strait with unique data on the sea-surface salinity, which controls surface water stratification and plays an important role in ocean circulation. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112090
Appears in Collections: 气候减缓与适应
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作者单位: GEOTOP-UQAM, CP 8888, Montréal, H3C 3P8, Canada; GEOMAR Helmholtz Centre for Ocean Research, Kiel, 24148, Germany; Academy of Sciences, Humanities and Literature, Mainz, 55131, Germany
Recommended Citation:
Falardeau J.,de Vernal A.,Spielhagen R.F.. Paleoceanography of northeastern Fram Strait since the last glacial maximum: Palynological evidence of large amplitude changes[J]. Quaternary Science Reviews,2018-01-01,195