DOI: 10.1016/j.quascirev.2014.02.018
Scopus记录号: 2-s2.0-84896290047
论文题名: Deep South Atlantic carbonate chemistry and increased interocean deep water exchange during last deglaciation
作者: Yu J. ; Anderson R.F. ; Jin Z. ; Menviel L. ; Zhang F. ; Ryerson F.J. ; Rohling E.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 90 起始页码: 80
结束页码: 89
语种: 英语
英文关键词: Carbonate ion
; Deep-sea
; Interocean exchange
Scopus关键词: Alkalinity
; Calcium carbonate
; Carbon
; Carbonation
; Climate change
; Concentration (process)
; Glacial geology
; Ion exchange
; Ions
; Isotopes
; Oceanography
; Atmospheric CO
; Carbonate ions
; Deep-sea
; Deep-water carbonates
; Elevated concentrations
; Glacial terminations
; Last Glacial Maximum
; North atlantic deep water formations
; Carbon dioxide
; accumulation
; alkalinity
; carbon
; carbon isotope
; climate change
; coral reef
; deep water formation
; degassing
; extraction
; Holocene
; last deglaciation
; Last Glacial Maximum
; seawater
; upwelling
; ventilation
; water exchange
; Antarctica
; Atlantic Ocean
; Atlantic Ocean (South)
; Deep South
; Pacific Ocean
; Southern Ocean
; United States
英文摘要: Carbon release from the deep ocean at glacial terminations is a critical component of past climate change, but the underlying mechanisms remain poorly understood. We present a 28,000-year high-resolution record of carbonate ion concentration, a key parameter of the global carbon cycle, at 5-km water depth in the South Atlantic. We observe similar carbonate ion concentrations between the Last Glacial Maximum and the late Holocene, despite elevated concentrations in the glacial surface ocean. This strongly supports the importance of respiratory carbon accumulation in a stratified deep ocean for atmospheric CO2 reduction during the last ice age. After ~9μmol/kg decline during Heinrich Stadial 1, deep South Atlantic carbonate ion concentration rose by ~24μmol/kg from the onset of Bølling to Pre-boreal, likely caused by strengthening North Atlantic Deep Water formation (Bølling) or increased ventilation in the Southern Ocean (Younger Drays) or both (Pre-boreal). The ~15μmol/kg decline in deep water carbonate ion since ~10ka is consistent with extraction of alkalinity from seawater by deep-sea CaCO3 compensation and coral reef growth on continental shelves during the Holocene. Between 16,600 and 15,000 years ago, deep South Atlantic carbonate ion values converged with those at 3.4-km water depth in the western equatorial Pacific, as did carbon isotope and radiocarbon values. These observations suggest a period of enhanced lateral exchange of carbon between the deep South Atlantic and Pacific Oceans, probably due to an increased transfer of momentum from southern westerlies to the Southern Ocean. By spreading carbon-rich deep Pacific waters around Antarctica for upwelling, invigorated interocean deep water exchange would lead to more efficient CO2 degassing from the Southern Ocean, and thus to an atmospheric CO2 rise, during the early deglaciation. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60326
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia; Lawrence Livermore National Laboratory, 7000 East Av., Livermore, CA 94550, United States; Lamont-Doherty Earth Observatory of 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; Climate Change Research Centre, University of New South Wales, Sydney, Australia; ARC Centre of Excellence for Climate System, Australia; Ocean and Earth Science, University of Southampton, National Oceanography Centre, Southampton SO14 3ZH, United Kingdom
Recommended Citation:
Yu J.,Anderson R.F.,Jin Z.,et al. Deep South Atlantic carbonate chemistry and increased interocean deep water exchange during last deglaciation[J]. Quaternary Science Reviews,2014-01-01,90