DOI: 10.1016/j.epsl.2018.03.006
Scopus记录号: 2-s2.0-85044043300
论文题名: Similar mid-depth Atlantic water mass provenance during the Last Glacial Maximum and Heinrich Stadial 1
作者: Howe J.N.W. ; Huang K.-F. ; Oppo D.W. ; Chiessi C.M. ; Mulitza S. ; Blusztajn J. ; Piotrowski A.M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 490 起始页码: 51
结束页码: 61
语种: 英语
英文关键词: Atlantic overturning
; Heinrich Stadial 1
; Last Glacial Maximum
; neodymium isotopes
Scopus关键词: Carbon
; Glacial geology
; Isotopes
; Neodymium
; Atlantic meridional overturning circulations
; Atlantic overturning
; Heinrich Stadial 1
; Intermediate waters
; Last Glacial Maximum
; Neodymium isotopes
; Neodymium isotopic composition
; Overturning circulation
; Oceanography
; intermediate water
; Last Glacial Maximum
; meridional circulation
; neodymium isotope
; overturn
; provenance
; tracer
; water mass
; Atlantic Ocean
; Atlantic Ocean (North)
; Atlantic Ocean (South)
英文摘要: The delivery of freshwater to the North Atlantic during Heinrich Stadial 1 (HS1) is thought to have fundamentally altered the operation of Atlantic meridional overturning circulation (AMOC). Although benthic foraminiferal carbon isotope records from the mid-depth Atlantic show a pronounced excursion to lower values during HS1, whether these shifts correspond to changes in water mass proportions, advection, or shifts in the carbon cycle remains unclear. Here we present new deglacial records of authigenic neodymium isotopes – a water mass tracer that is independent of the carbon cycle – from two cores in the mid-depth South Atlantic. We find no change in neodymium isotopic composition, and thus water mass proportions, between the Last Glacial Maximum (LGM) and HS1, despite large decreases in carbon isotope values at the onset of HS1 in the same cores. We suggest that the excursions of carbon isotopes to lower values were likely caused by the accumulation of respired organic matter due to slow overturning circulation, rather than to increased southern-sourced water, as typically assumed. The finding that there was little change in water mass provenance in the mid-depth South Atlantic between the LGM and HS1, despite decreased overturning, suggests that the rate of production of mid-depth southern-sourced water mass decreased in concert with decreased production of northern-sourced intermediate water at the onset of HS1. Consequently, we propose that even drastic changes in the strength of AMOC need not cause a significant change in South Atlantic mid-depth water mass proportions. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109946
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: Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, United Kingdom; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Institute of Earth Sciences, Academia Sinica, 128, Sec. 2, Academia Road, Taipei, Nangang 11529, Taiwan; School of Arts, Sciences and Humanities, University of São Paulo, São Paulo, Av. Arlindo Bettio 1000, CEP03828-000, São Paulo, SP, Brazil; MARUM – Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, D-28359, Germany
Recommended Citation:
Howe J.N.W.,Huang K.-F.,Oppo D.W.,et al. Similar mid-depth Atlantic water mass provenance during the Last Glacial Maximum and Heinrich Stadial 1[J]. Earth and Planetary Science Letters,2018-01-01,490