DOI: 10.1016/j.quascirev.2013.06.020
Scopus记录号: 2-s2.0-84880409132
论文题名: Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial-interglacial cycle
作者: Yu J. ; Anderson R.F. ; Jin Z. ; Rae J.W.B. ; Opdyke B.N. ; Eggins S.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 76 起始页码: 39
结束页码: 52
语种: 英语
英文关键词: B/Ca
; Carbonate compensation
; Deep ocean carbonate ion
; Global carbon cycle
; Ocean stratification
; Pleistocene
Scopus关键词: Carbonate ions
; Deep-water carbonates
; Equatorial Pacific Ocean
; Glacial-interglacial cycles
; Global carbon cycle
; Marine isotope stages
; Ocean stratification
; Pleistocene
; Calcium carbonate
; Carbon
; Carbon dioxide
; Glacial geology
; Isotopes
; Sea level
; Carbonation
; carbonate system
; deep water
; global change
; Last Glacial-Interglacial
; stratification
; Atlantic Ocean
; Atlantic Ocean (North)
英文摘要: We present new deep water carbonate ion concentration ([CO32-]) records, reconstructed using Cibicidoides wuellerstorfi B/Ca, for one core from Caribbean Basin (water depth=3623m, sill depth=1.8km) and three cores located at 2.3-4.3km water depth from the equatorial Pacific Ocean during the Last Glacial-interglacial cycle. The pattern of deep water [CO32-] in the Caribbean Basin roughly mirrors that of atmospheric CO2, reflecting a dominant influence from preformed [CO32-] in the North Atlantic Ocean. Compared to the amplitude of ~65μmol/kg in the deep Caribbean Basin, deep water [CO32-] in the equatorial Pacific Ocean has varied by no more than ~15μmol/kg due to effective buffering of CaCO3 on deep-sea pH in the Pacific Ocean. Our results suggest little change in the global mean deep ocean [CO32-] between the Last Glacial Maximum (LGM) and the Late Holocene. The three records from the Pacific Ocean show long-term increases in [CO32-] by ~7μmol/kg from Marine Isotope Stage (MIS) 5c to mid MIS 3, consistent with the response of the deep ocean carbonate system to a decline in neritic carbonate production associated with ~60m drop in sea-level (the "coral-reef" hypothesis). Superimposed upon the long-term trend, deep water [CO32-] in the Pacific Ocean displays transient changes, which decouple with δ13C in the same cores, at the start and end of MIS 4. These changes in [CO32-] and δ13C are consistent with what would be expected from vertical nutrient fractionation and carbonate compensation. The observed ~4μmol/kg [CO32-] decline in the two Pacific cores at >3.4km water depth from MIS 3 to the LGM indicate further strengthening of deep ocean stratification, which contributed to the final step of atmospheric CO2 drawdown during the last glaciation. The striking similarity between deep water [CO32-] and 230Th-normalized CaCO3 flux at two adjacent sites from the central equatorial Pacific Ocean provides convincing evidence that deep-sea carbonate dissolution dominantly controlled CaCO3 preservation at these sites in the past. Our results offer new and quantitative constraints from deep ocean carbonate chemistry to understand roles of various mechanisms in atmospheric CO2 changes over the Last Glacial-interglacial cycle. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60537
Appears in Collections: 过去全球变化的重建
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作者单位: Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia; Lamont-Doherty Earth Observatory, Columbia University, 61 Route 9W/PO Box 1000, Palisades, NY 10964-8000, United States; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States
Recommended Citation:
Yu J.,Anderson R.F.,Jin Z.,et al. Responses of the deep ocean carbonate system to carbon reorganization during the Last Glacial-interglacial cycle[J]. Quaternary Science Reviews,2013-01-01,76