DOI: 10.1016/j.epsl.2017.10.011
Scopus记录号: 2-s2.0-85033572227
论文题名: Seasonal sea ice cover during the warm Pliocene: Evidence from the Iceland Sea (ODP Site 907)
作者: Clotten C. ; Stein R. ; Fahl K. ; De Schepper S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 481 起始页码: 61
结束页码: 72
语种: 英语
英文关键词: alkenones
; East Greenland Current
; IP25
; Pliocene
; sea ice
; sterols
Scopus关键词: Alcohols
; Lipids
; Oceanography
; Sea ice
; Surface waters
; Alkenones
; East greenland currents
; IP25
; Pliocene
; sterols
; Ice
; alkenone
; ice cover
; Ocean Drilling Program
; palynology
; Pliocene
; sea ice
; sterol
; Arctic Ocean
; East Greenland Current
; Iceland
英文摘要: Sea ice is a critical component in the Arctic and global climate system, yet little is known about its extent and variability during past warm intervals, such as the Pliocene (5.33–2.58 Ma). Here, we present the first multi-proxy (IP25, sterols, alkenones, palynology) sea ice reconstructions for the Late Pliocene Iceland Sea (ODP Site 907). Our interpretation of a seasonal sea ice cover with occasional ice-free intervals between 3.50–3.00 Ma is supported by reconstructed alkenone-based summer sea surface temperatures. As evidenced from brassicasterol and dinosterol, primary productivity was low between 3.50 and 3.00 Ma and the site experienced generally oligotrophic conditions. The East Greenland Current (and East Icelandic Current) may have transported sea ice into the Iceland Sea and/or brought cooler and fresher waters favoring local sea ice formation. Between 3.00 and 2.40 Ma, the Iceland Sea is mainly sea ice-free, but seasonal sea ice occurred between 2.81 and 2.74 Ma. Sea ice extending into the Iceland Sea at this time may have acted as a positive feedback for the build-up of the Greenland Ice Sheet (GIS), which underwent a major expansion ∼2.75 Ma. Thereafter, most likely a stable sea ice edge developed close to Greenland, possibly changing together with the expansion and retreat of the GIS and affecting the productivity in the Iceland Sea. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110186
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Uni Research Climate, Bjerknes Centre for Climate Research, Jahnebakken 5, Bergen, 5007, Norway; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, 27568, Germany; Department of Geosciences (FB5), University of Bremen, Klagenfurter Str. 4, Bremen, 28359, Germany
Recommended Citation:
Clotten C.,Stein R.,Fahl K.,et al. Seasonal sea ice cover during the warm Pliocene: Evidence from the Iceland Sea (ODP Site 907)[J]. Earth and Planetary Science Letters,2018-01-01,481