IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion
Ma, Xiaolin1,2; Tian, Jun1; Ma, Wentao1,3; Li, Ke1; Yu, Jimin1,4
2018-02-15
Source PublicationEARTH AND PLANETARY SCIENCE LETTERS
Volume484Issue:2018Pages:253-263
SubtypeArticle
AbstractEast Antarctic ice sheet expansion (EAIE) at similar to 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 (epsilon Nd) and benthic foraminiferal B/Ca records from the South China Sea (SCS), newly integrated meridional Pacific benthic foraminiferal delta O-18 and delta C-13 records and simulated results from a biogeochemical box model to explore the responses of deep Pacific Ocean circulation and carbon cycle across EAIE. The epsilon Nd and meridional benthic delta C-13 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 [CO32-] 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 similar to 1 parts per thousand positive delta C-13 excursion during EAIE could be attributed to increased weathering of high-delta C-13 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. (C) 2017 Elsevier B.V. All rights reserved.
KeywordDeep Pacific Ocean Circulation Middle Miocene Carbonate Chemistry East Antarctic Ice Sheet Expansion
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.epsl.2017.12.002
WOS KeywordSOUTH CHINA SEA ; OCEAN CIRCULATION ; ATMOSPHERIC CO2 ; PALEOCEANOGRAPHIC EVOLUTION ; ISOTOPE STRATIGRAPHY ; TECTONIC EVOLUTION ; CLIMATE TRANSITION ; RECONSTRUCTIONS ; PRESERVATION ; GLACIATION
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000424726000022
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Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5190
Collection黄土与第四纪地质国家重点实验室(2010~)
Affiliation1.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Shaanxi, Peoples R China
3.SOA, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, Zhejiang, Peoples R China
4.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia
Recommended Citation
GB/T 7714
Ma, Xiaolin,Tian, Jun,Ma, Wentao,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,2018,484(2018):253-263.
APA Ma, Xiaolin,Tian, Jun,Ma, Wentao,Li, Ke,&Yu, Jimin.(2018).Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion.EARTH AND PLANETARY SCIENCE LETTERS,484(2018),253-263.
MLA Ma, Xiaolin,et al."Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion".EARTH AND PLANETARY SCIENCE LETTERS 484.2018(2018):253-263.
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