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| Oliver, K. I. C.; Hoogakker, B. A. A.; Crowhurst, S.; Henderson, G. M.; Rickaby, R. E. M.; Edwards, N.r.; Elderfield, H.. |
| The isotopic composition of carbon, delta C-13, in seawater is used in reconstructions of ocean circulation, marine productivity, air-sea gas exchange, and biosphere carbon storage. Here, a synthesis of delta C-13 measurements taken from foraminifera in marine sediment cores over the last 150 000 years is presented. The dataset comprises previously published and unpublished data from benthic and planktonic records throughout the global ocean. Data are placed on a common delta O-18 age scale suitable for examining orbital timescale variability but not millennial events, which are removed by a 10 ka filter. Error estimates account for the resolution and scatter of the original data, and uncertainty in the relationship between delta C-13 of calcite and of... |
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| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00231/34258/32632.pdf |
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| Hoogakker, B. A. A.; Thornalley, D. J. R.; Barker, S.. |
| Glacial-interglacial changes in bottom water oxygen concentrations [O-2] in the deep northeast Atlantic have been linked to decreased ventilation relating to changes in ocean circulation and the biological pump (Hoogakker et al., 2015). In this paper we discuss seawater [O-2] changes in relation to millennial climate oscillations in the North Atlantic over the last glacial cycle, using bottom water [O-2] reconstructions from 2 cores: (1) MD95-2042 from the deep northeast Atlantic (Hoogakker et al., 2015) and (2) ODP (Ocean Drilling Program) Site 1055 from the intermediate north-west Atlantic. The deep northeast Atlantic core MD95-2042 shows decreased bottom water [O-2] during millennial-scale cool events, with lowest bottom water [O-2] of 170, 144, and 166... |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00353/46416/46157.pdf |
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