Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 484, Issue -, Pages 253-263Publisher
ELSEVIER
DOI: 10.1016/j.epsl.2017.12.002
Keywords
deep Pacific Ocean circulation; middle Miocene; carbonate chemistry; East Antarctic ice sheet expansion
Categories
Funding
- NSFC [41525020, 91428310, 41676026, 41706071]
- Shanghai Human Development Fund [201336]
- Program of Shanghai Subject Chief Scientist (A type) [16XD1403000]
- SOED [QNHX1605]
- ARC [DP140101393, FT140100993]
- Australian Research Council [FT140100993] Funding Source: Australian Research Council
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East 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.
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