ORCID Profile
0000-0003-4216-3214
Current Organisations
British Geological Survey
,
University of Exeter Cornwall Campus
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Publisher: Springer Science and Business Media LLC
Date: 26-02-2014
DOI: 10.1038/SREP04187
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 ([CO 3 2− ]) 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 [CO 3 2− ] 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 CO 2 decline before ~14 Ma.
Publisher: Springer Science and Business Media LLC
Date: 24-08-2015
DOI: 10.1038/NGEO2515
Publisher: American Geophysical Union (AGU)
Date: 12-2010
DOI: 10.1029/2009PA001906
Publisher: Springer Science and Business Media LLC
Date: 29-04-2016
DOI: 10.1038/NGEO2704
Publisher: Springer Science and Business Media LLC
Date: 05-03-2018
DOI: 10.1038/S41467-018-02845-5
Abstract: Sea ice and associated feedback mechanisms play an important role for both long- and short-term climate change. Our ability to predict future sea ice extent, however, hinges on a greater understanding of past sea ice dynamics. Here we investigate sea ice changes in the eastern Bering Sea prior to, across, and after the Mid-Pleistocene transition (MPT). The sea ice record, based on the Arctic sea ice biomarker IP 25 and related open water proxies from the International Ocean Discovery Program Site U1343, shows a substantial increase in sea ice extent across the MPT. The occurrence of late-glacial/deglacial sea ice maxima are consistent with sea ice/land ice hysteresis and land−glacier retreat via the temperature−precipitation feedback. We also identify interactions of sea ice with phytoplankton growth and ocean circulation patterns, which have important implications for glacial North Pacific Intermediate Water formation and potentially North Pacific abyssal carbon storage.
Publisher: Elsevier BV
Date: 05-2011
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Sev Kender.