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|Title:||Deep ocean carbonate ion increase during mid Miocene CO2 decline|
Peck, V. L.
|Publisher:||Nature Publishing Group|
|Citation:||Scientific Reports 4, Article number: 4187|
|Abstract:||Characterised by long term cooling and abrupt ice sheet expansion on Antarctica ~14 Ma ago, the mid Miocene marked the beginning of the modern ice-house world, yet there is still little consensus on its causes, in part because carbon cycle dynamics are not well constrained. In particular, changes in carbonate ion concentration ([CO32−]) in the ocean, the largest carbon reservoir of the ocean-land-atmosphere system, are poorly resolved. We use benthic foraminiferal B/Ca ratios to reconstruct relative changes in [CO32−] from the South Atlantic, East Pacific, and Southern Oceans. Our results suggest an increase of perhaps ~40 μmol/kg may have occurred between ~15 and 14 Ma in intermediate to deep waters in each basin. This long-term increase suggests elevated alkalinity input, perhaps from the Himalaya, rather than other shorter-term mechanisms such as ocean circulation or ecological changes, and may account for some of the proposed atmospheric CO2 decline before ~14 Ma.|
|Rights:||This work is licensed under a Creative Commons Attribution 3.0 Unported License (CC BY 3.0). To view a copy of this license, visit http://creativecommons.org/licenses/by/3.0/|
|Description:||Supplementary information available at http://www.nature.com/srep/2014/140226/srep04187/full/srep04187.html#supplementary-information|
|Appears in Collections:||Published Articles, Dept. of Geology|
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