Variations in the Zn/Si record over the last interglacial glacial transition

M. J. Ellwood; K. A. Hunter

doi:10.1029/1999PA000470

Variations in the Zn/Si record over the last interglacial glacial transition

M. J. Ellwood, K. A. Hunter

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

We examined the zinc content of diatom frustules as an indicator of past changes in surface seawater Zn²⁺ concentration. Zn/Si data of samples from three cores located in the South Atlantic sector of the Southern Ocean spanning the last interglacial-glacial transition are presented. Changes in the Zn/Si record are linked to changes in the surface water Zn²⁺ concentration. The source of variation in Zn²⁺ concentration appears to be via changes in deep water upwelling and circulation. We rule out changes in phytoplankton productivity and aeolian dust input as a source of variation in the Zn/Si record. Likewise, the Zn/Si data are not linked to shifts in the diatom species composition of the sediment or sediment preservation effects. The Zn/Si results presented do not support the zinc hypothesis. There is no link between the uptake of CO₂ by phytoplankton, as inferred from the δ¹³C record, and the Zn/Si record.

Original language	English
Pages (from-to)	506-514
Number of pages	9
Journal	Paleoceanography
Volume	15
Issue number	5
DOIs	https://doi.org/10.1029/1999PA000470
Publication status	Published - 1 Oct 2000
Externally published	Yes

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title = "Variations in the Zn/Si record over the last interglacial glacial transition",

abstract = "We examined the zinc content of diatom frustules as an indicator of past changes in surface seawater Zn2+ concentration. Zn/Si data of samples from three cores located in the South Atlantic sector of the Southern Ocean spanning the last interglacial-glacial transition are presented. Changes in the Zn/Si record are linked to changes in the surface water Zn2+ concentration. The source of variation in Zn2+ concentration appears to be via changes in deep water upwelling and circulation. We rule out changes in phytoplankton productivity and aeolian dust input as a source of variation in the Zn/Si record. Likewise, the Zn/Si data are not linked to shifts in the diatom species composition of the sediment or sediment preservation effects. The Zn/Si results presented do not support the zinc hypothesis. There is no link between the uptake of CO2 by phytoplankton, as inferred from the δ13C record, and the Zn/Si record.",

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N2 - We examined the zinc content of diatom frustules as an indicator of past changes in surface seawater Zn2+ concentration. Zn/Si data of samples from three cores located in the South Atlantic sector of the Southern Ocean spanning the last interglacial-glacial transition are presented. Changes in the Zn/Si record are linked to changes in the surface water Zn2+ concentration. The source of variation in Zn2+ concentration appears to be via changes in deep water upwelling and circulation. We rule out changes in phytoplankton productivity and aeolian dust input as a source of variation in the Zn/Si record. Likewise, the Zn/Si data are not linked to shifts in the diatom species composition of the sediment or sediment preservation effects. The Zn/Si results presented do not support the zinc hypothesis. There is no link between the uptake of CO2 by phytoplankton, as inferred from the δ13C record, and the Zn/Si record.

AB - We examined the zinc content of diatom frustules as an indicator of past changes in surface seawater Zn2+ concentration. Zn/Si data of samples from three cores located in the South Atlantic sector of the Southern Ocean spanning the last interglacial-glacial transition are presented. Changes in the Zn/Si record are linked to changes in the surface water Zn2+ concentration. The source of variation in Zn2+ concentration appears to be via changes in deep water upwelling and circulation. We rule out changes in phytoplankton productivity and aeolian dust input as a source of variation in the Zn/Si record. Likewise, the Zn/Si data are not linked to shifts in the diatom species composition of the sediment or sediment preservation effects. The Zn/Si results presented do not support the zinc hypothesis. There is no link between the uptake of CO2 by phytoplankton, as inferred from the δ13C record, and the Zn/Si record.

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DO - 10.1029/1999PA000470

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Variations in the Zn/Si record over the last interglacial glacial transition

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