Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion
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 ben...
Published in: | Earth and Planetary Science Letters |
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/206496 2024-01-14T10:02:26+01:00 Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion Ma, Xiaolin Tian, Jun Ma, Wentao Li, Ke Yu, Jimin application/pdf http://hdl.handle.net/1885/206496 https://doi.org/10.1016/j.epsl.2017.12.002 https://openresearch-repository.anu.edu.au/bitstream/1885/206496/3/Ma%20et%20al.%2c%20EPSL%2c.pdf.jpg en_AU eng Elsevier http://purl.org/au-research/grants/arc/DP140101393 http://purl.org/au-research/grants/arc/FT140100993 0012-821X http://hdl.handle.net/1885/206496 doi:10.1016/j.epsl.2017.12.002 https://openresearch-repository.anu.edu.au/bitstream/1885/206496/3/Ma%20et%20al.%2c%20EPSL%2c.pdf.jpg © 2017 Elsevier B.V https://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) Earth and Planetary Science Letters deep Pacific Ocean circulation middle Miocene carbonate chemistry East Antarctic ice sheet expansion Journal article ftanucanberra https://doi.org/10.1016/j.epsl.2017.12.002 2023-12-15T09:38:04Z 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. Funding for this research was provided by the NSFC (Grant Nos. 41525020, 91428310, 41676026, 41706071), Shanghai Human Development Fund (201336), and Program of Shanghai Subject Chief Scientist (A type) (16XD1403000). WM thanks the grant of Youth Visiting Ocean-Star Scholars fellowship (QNHX1605) from SOED. JY is also funded by ARC DP140101393 and FT140100993. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Australian National University: ANU Digital Collections Antarctic East Antarctic Ice Sheet Pacific Earth and Planetary Science Letters 484 253 263 |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
English |
topic |
deep Pacific Ocean circulation middle Miocene carbonate chemistry East Antarctic ice sheet expansion |
spellingShingle |
deep Pacific Ocean circulation middle Miocene carbonate chemistry East Antarctic ice sheet expansion Ma, Xiaolin Tian, Jun Ma, Wentao Li, Ke Yu, Jimin Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion |
topic_facet |
deep Pacific Ocean circulation middle Miocene carbonate chemistry East Antarctic ice sheet expansion |
description |
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. Funding for this research was provided by the NSFC (Grant Nos. 41525020, 91428310, 41676026, 41706071), Shanghai Human Development Fund (201336), and Program of Shanghai Subject Chief Scientist (A type) (16XD1403000). WM thanks the grant of Youth Visiting Ocean-Star Scholars fellowship (QNHX1605) from SOED. JY is also funded by ARC DP140101393 and FT140100993. |
format |
Article in Journal/Newspaper |
author |
Ma, Xiaolin Tian, Jun Ma, Wentao Li, Ke Yu, Jimin |
author_facet |
Ma, Xiaolin Tian, Jun Ma, Wentao Li, Ke Yu, Jimin |
author_sort |
Ma, Xiaolin |
title |
Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion |
title_short |
Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion |
title_full |
Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion |
title_fullStr |
Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion |
title_full_unstemmed |
Changes of deep Pacific overturning circulation and carbonate chemistry during middle Miocene East Antarctic ice sheet expansion |
title_sort |
changes of deep pacific overturning circulation and carbonate chemistry during middle miocene east antarctic ice sheet expansion |
publisher |
Elsevier |
url |
http://hdl.handle.net/1885/206496 https://doi.org/10.1016/j.epsl.2017.12.002 https://openresearch-repository.anu.edu.au/bitstream/1885/206496/3/Ma%20et%20al.%2c%20EPSL%2c.pdf.jpg |
geographic |
Antarctic East Antarctic Ice Sheet Pacific |
geographic_facet |
Antarctic East Antarctic Ice Sheet Pacific |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Earth and Planetary Science Letters |
op_relation |
http://purl.org/au-research/grants/arc/DP140101393 http://purl.org/au-research/grants/arc/FT140100993 0012-821X http://hdl.handle.net/1885/206496 doi:10.1016/j.epsl.2017.12.002 https://openresearch-repository.anu.edu.au/bitstream/1885/206496/3/Ma%20et%20al.%2c%20EPSL%2c.pdf.jpg |
op_rights |
© 2017 Elsevier B.V https://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) |
op_doi |
https://doi.org/10.1016/j.epsl.2017.12.002 |
container_title |
Earth and Planetary Science Letters |
container_volume |
484 |
container_start_page |
253 |
op_container_end_page |
263 |
_version_ |
1788057466999668736 |