DOI: 10.5194/cp-9-1505-2013
Scopus记录号: 2-s2.0-84882745086
论文题名: Northward advection of Atlantic water in the eastern Nordic Seas over the last 3000 yr
作者: Dylmer C.V. ; Giraudeau J. ; Eynaud F. ; Husum K. ; De Vernal A.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 4 起始页码: 1505
结束页码: 1518
语种: 英语
Scopus关键词: amplitude
; cobaltite
; Little Ice Age
; marine sediment
; North Atlantic Oscillation
; paleoclimate
; paleoenvironment
; sediment core
; surface water
; water mass
; Arctic Ocean
; Barents Sea
; Norwegian Sea
英文摘要: Three marine sediment cores distributed along the Norwegian (MD95-2011), Barents Sea (JM09-KA11-GC), and Svalbard (HH11-134-BC) continental margins have been investigated in order to reconstruct changes in the poleward flow of Atlantic waters (AW) and in the nature of upper surface water masses within the eastern Nordic Seas over the last 3000 yr. These reconstructions are based on a limited set of coccolith proxies: the abundance ratio between Emiliania huxleyi and Coccolithus pelagicus, an index of Atlantic vs. Polar/Arctic surface water masses; and Gephyrocapsa muellerae, a drifted coccolith species from the temperate North Atlantic, whose abundance changes are related to variations in the strength of the North Atlantic Current. The entire investigated area, from 66 to 77° N, was affected by an overall increase in AWflow from 3000 cal yr BP (before present) to the present. The long-term modulation of westerlies' strength and location, which are essentially driven by the dominant mode of the North Atlantic Oscillation (NAO), is thought to explain the observed dynamics of poleward AW flow. The same mechanism also reconciles the recorded opposite zonal shifts in the location of the Arctic front between the area off western Norway and the western Barents Sea-eastern Fram Strait region. The Little Ice Age (LIA) was governed by deteriorating conditions, with Arctic/Polar waters dominating in the surface off western Svalbard and western Barents Sea, possibly associated with both severe sea ice conditions and a strongly reduced AW strength. A sudden short pulse of resumed high WSC (West Spitsbergen Current) flow interrupted this cold spell in eastern Fram Strait from 330 to 410 cal yr BP. Our dataset not only confirms the high amplitude warming of surface waters at the turn of the 19th century off western Svalbard, it also shows that such a warming was primarily induced by an excess flow of AW which stands as unprecedented over the last 3000 yr. © Author(s) 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49406
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Dylmer C.V.,Giraudeau J.,Eynaud F.,et al. Northward advection of Atlantic water in the eastern Nordic Seas over the last 3000 yr[J]. Climate of the Past,2013-01-01,9(4)