DOI: 10.1016/j.epsl.2017.12.002
Scopus记录号: 2-s2.0-85039159026
论文题名: Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion
作者: Ma X. ; Tian J. ; Ma W. ; Li K. ; Yu J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484 起始页码: 253
结束页码: 263
语种: 英语
英文关键词: carbonate chemistry
; deep Pacific Ocean circulation
; East Antarctic ice sheet expansion
; middle Miocene
Scopus关键词: Calcium carbonate
; Carbon dioxide
; Carbonation
; Expansion
; Glacial geology
; Glaciers
; Ice
; Oceanography
; Sea level
; Water levels
; Weathering
; Carbon cycle changes
; Carbonate weathering
; East antarctic ice sheets
; Mass accumulation rates
; Middle Miocene
; Overturning circulation
; Pacific meridional overturning circulation
; Pacific ocean
; Calcium compounds
; benthic foraminifera
; calcium carbonate
; carbon dioxide
; carbon isotope
; carbonate rock
; deep water formation
; Miocene
; overturn
; oxygen isotope
; paleoclimate
; Antarctic Ice Sheet
; Antarctica
; East Antarctic Ice Sheet
; East Antarctica
; Pacific Ocean
; Pacific Ocean (East)
; South China Sea
英文摘要: East Antarctic ice sheet expansion (EAIE) at ∼13.9 Ma in the middle Miocene represents a major climatic event during the long-term Cenozoic cooling, but ocean circulation and carbon cycle changes during this event remain unclear. Here, we present new fish teeth isotope (εNd) and benthic foraminiferal B/Ca records from the South China Sea (SCS), newly integrated meridional Pacific benthic foraminiferal δ18O and δ13C records and simulated results from a biogeochemical box model to explore the responses of deep Pacific Ocean circulation and carbon cycle across EAIE. The εNd and meridional benthic δ13C records reveal a more isolated Pacific Deep Water (PDW) and a sluggish Pacific meridional overturning circulation during the post-EAIE with respect to the pre-EAIE owing to weakened southern-sourced deep water formation. The deep-water [CO2−3] and calcium carbonate mass accumulation rate in the SCS display markedly similar increases followed by recoveries to the pre-EAIE level during EAIE, which were probably caused by a shelf–basin shift of CaCO3 deposition and strengthened weathering due to a sea level fall within EAIE. The model results show that the ∼1‰ positive δ13C excursion during EAIE could be attributed to increased weathering of high-δ13C shelf carbonates and a terrestrial carbon reservoir expansion. The drawdown of atmospheric CO2 over the middle Miocene were probably caused by combined effects of increased shelf carbonate weathering, expanded land biosphere carbon storage and a sluggish deep Pacific meridional overturning circulation. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110049
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: State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710075, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, SOA, Hangzhou, 310012, China; Research School of Earth Sciences, the Australian National University, Canberra, ACT 2601, Australia
Recommended Citation:
Ma X.,Tian J.,Ma W.,et al. Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion[J]. Earth and Planetary Science Letters,2018-01-01,484