DOI: 10.1016/j.quascirev.2014.04.005
Scopus记录号: 2-s2.0-84899732410
论文题名: The transition on North America from the warm humid Pliocene to the glaciated Quaternary traced by eolian dust deposition at a benchmark North Atlantic Ocean drill site
作者: Lang D.C. ; Bailey I. ; Wilson P.A. ; Beer C.J. ; Bolton C.T. ; Friedrich O. ; Newsam C. ; Spencer M.R. ; Gutjahr M. ; Foster G.L. ; Cooper M.J. ; Milton J.A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 93 起始页码: 125
结束页码: 141
语种: 英语
英文关键词: Dust
; Eolian
; Laurentide ice sheet
; North America
; North Atlantic
; Pliocene
; Quaternary
Scopus关键词: Biomarkers
; Calcium carbonate
; Carbon dioxide
; Climate models
; Dust
; Glaciers
; Isotopes
; Lead
; Lithology
; Oceanography
; Strontium
; Biomarkers
; Calcium carbonate
; Carbon dioxide
; Climate models
; Dust
; Glaciers
; Isotopes
; Lead
; Lithology
; Oceanography
; Strontium
; Eolian
; Laurentide ice sheets
; North America
; North Atlantic
; Pliocene
; Quaternary
; Glacial geology
; Glacial geology
; accumulation rate
; anthropogenic source
; benchmarking
; biomarker
; carbon dioxide
; carbon isotope
; Deep Sea Drilling Project
; eolian deposit
; glaciation
; hydrological cycle
; Laurentide Ice Sheet
; marine isotope stage
; Pleistocene
; Atlantic Ocean
; Atlantic Ocean (North)
; North America
; Foraminifera
英文摘要: We present Plio-Pleistocene records of sediment color, %CaCO3, foraminifer fragmentation, benthic carbon isotopes (δ13C) and radiogenic isotopes (Sr, Nd, Pb) of the terrigenous component from IODP Site U1313, a reoccupation of benchmark subtropical North Atlantic Ocean DSDP Site 607. We show that (inter)glacial cycles in sediment color and %CaCO3 pre-date major northern hemisphere glaciation and are unambiguously and consistently correlated to benthic oxygen isotopes back to 3.3 million years ago (Ma) and intermittently so probably back to the Miocene/Pliocene boundary. We show these lithological cycles to be driven by enhanced glacial fluxes of terrigenous material (eolian dust), not carbonate dissolution (the classic interpretation). Our radiogenic isotope data indicate a North American source for this dust (~3.3-2.4Ma) in keeping with the interpreted source of terrestrial plant wax-derived biomarkers deposited at Site U1313. Yet our data indicate a mid latitude provenance regardless of (inter)glacial state, a finding that is inconsistent with the biomarker-inferred importance of glaciogenic mechanisms of dust production and transport. Moreover, we find that the relation between the biomarker and lithogenic components of dust accumulation is distinctly non-linear. Both records show a jump in glacial rates of accumulation from Marine Isotope Stage, MIS, G6 (2.72Ma) onwards but the amplitude of this signal is about 3-8 times greater for biomarkers than for dust and particularly extreme during MIS 100 (2.52Ma). We conclude that North America shifted abruptly to a distinctly more arid glacial regime from MIS G6, but major shifts in glacial North American vegetation biomes and regional wind fields (exacerbated by the growth of a large Laurentide Ice Sheet during MIS 100) likely explain amplification of this signal in the biomarker records. Our findings are consistent with wetter-than-modern reconstructions of North American continental climate under the warm high CO2 conditions of the Early Pliocene but contrast with most model predictions for the response of the hydrological cycle to anthropogenic warming over the coming 50 years (poleward expansion of the subtropical dry zones). © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60266
Appears in Collections: 过去全球变化的重建
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作者单位: National Oceanography Centre Southampton, University of Southampton, Waterfront Campus, European Way, Southampton SO14 3ZH, United Kingdom; Camborne School of Mines, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Penryn Campus, Treliever Road, Penryn, Cornwall TR10 9FE, United Kingdom; Facultad de Geología, Universidad de Oviedo, Campus de Llamaquique, Jesús Arias de Velasco s/n, 33005 Oviedo, Spain; Institute of Earth Sciences, University of Heidelberg, Im Neuenheimer Feld 234-236, 69120 Heidelberg, Germany; Earth Sciences, University College London, Gower Street, London WC1E 6BT, United Kingdom; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstrasse 1-3, 24148 Kiel, Germany
Recommended Citation:
Lang D.C.,Bailey I.,Wilson P.A.,et al. The transition on North America from the warm humid Pliocene to the glaciated Quaternary traced by eolian dust deposition at a benchmark North Atlantic Ocean drill site[J]. Quaternary Science Reviews,2014-01-01,93