DOI: 10.1016/j.gloplacha.2016.08.010
论文题名: The demise of the early Eocene greenhouse – Decoupled deep and surface water cooling in the eastern North Atlantic
作者: Bornemann A. ; D'haenens S. ; Norris R.D. ; Speijer R.P.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 145 起始页码: 130
结束页码: 140
语种: 英语
英文关键词: Eocene
; Foraminifera
; North Atlantic
; Paleocene
; Paleoclimate
; Stable isotopes
Scopus关键词: Cooling water
; Deepwater drilling
; Glacial geology
; Greenhouses
; Isotopes
; Oceanography
; Eocene
; Foraminifera
; North Atlantic
; Paleocene
; Paleoclimates
; Stable isotopes
; Surface waters
; Foraminifera
英文摘要: Early Paleogene greenhouse climate culminated during the early Eocene Climatic Optimum (EECO, 50 to 53 Ma). This episode of global warmth is subsequently followed by an almost 20 million year-long cooling trend leading to the Eocene-Oligocene glaciation of Antarctica. Here we present the first detailed planktic and benthic foraminiferal isotope single site record (δ13C, δ18O) of late Paleocene to middle Eocene age from the North Atlantic (Deep Sea Drilling Project Site 401, Bay of Biscay). Good core recovery in combination with well preserved foraminifera makes this site suitable for correlations and comparison with previously published long-term records from the Pacific Ocean (e.g. Allison Guyot, Shatsky Rise), the Southern Ocean (Maud Rise) and the equatorial Atlantic (Demerara Rise). Whereas our North Atlantic benthic foraminiferal δ18O and δ13C data agree with the global trend showing the long-term shift toward heavier δ18O values, we only observe minor surface water δ18O changes during the middle Eocene (if at all) in planktic foraminiferal data. Apparently, the surface North Atlantic did not cool substantially during the middle Eocene. Thus, the North Atlantic appears to have had a different surface ocean cooling history during the middle Eocene than the southern hemisphere, whereas cooler deep-water masses were comparatively well mixed. Our results are in agreement with previously published findings from Tanzania, which also support the idea of a muted post-EECO surface-water cooling outside the southern high-latitudes. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84987917073&doi=10.1016%2fj.gloplacha.2016.08.010&partnerID=40&md5=30c0838a9217abc338b482fc15e2538a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11626
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, Hannover, Germany
Recommended Citation:
Bornemann A.,D'haenens S.,Norris R.D.,et al. The demise of the early Eocene greenhouse – Decoupled deep and surface water cooling in the eastern North Atlantic[J]. Global and Planetary Change,2016-01-01,145.