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Dissolved trace metals (Ni, Zn, Co, Cd, Pb, Al, and Mn) around the Crozet Islands, Southern Ocean

Dissolved trace metals (Ni, Zn, Co, Cd, Pb, Al, and Mn) around the Crozet Islands, Southern Ocean
Dissolved trace metals (Ni, Zn, Co, Cd, Pb, Al, and Mn) around the Crozet Islands, Southern Ocean
A phytoplankton bloom shown to be naturally iron (Fe) induced occurs north of the Crozet Islands (Southern Ocean) every year, providing an ideal opportunity to study dissolved trace metal distributions within an island system located in a high nutrient low chlorophyll (HNLC) region. We present water column profiles of dissolved nickel (Ni), zinc (Zn), cobalt (Co), cadmium (Cd), lead (Pb), aluminium (Al), and manganese (Mn) obtained as part of the NERC CROZEX program during austral summer (2004–2005). Two stations (M3 and M1) were sampled downstream (north) of Crozet in the bloom area and near the islands, along with a control station (M2) in the HNLC zone upstream (south) of the islands. The general range found was for Ni, 4.64–6.31 nM; Zn, 1.59–7.75 nM; Co, 24–49 pM; Cd, 135–673 pM; Pb, 6–22 pM; Al, 0.13–2.15 nM; and Mn, 0.07–0.64 nM. Vertical profiles indicate little island influence to the south with values in the range of other trace metal deprived regions of the Southern Ocean. Significant removal of Ni and Cd was observed in the bloom and Zn was moderately correlated with reactive silicate (Si) indicating diatom control over the internal cycling of this metal. Higher concentrations of Zn and Cd were observed near the islands. Pb, Al, and Mn distributions also suggest small but significant atmospheric dust supply particularly in the northern region.
Southern Ocean, trace metals, biogeochemical cycles, iron fertilization
2169-9275
5188-5201
Castrillejo, Maxi
325bb6c1-4b36-4f1d-bfbf-deda63ffa535
Statham, Peter J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Fones, Gary R.
304f9c63-0e4d-4b0b-9240-8a9e8dd2bf85
Planquette, Hélène
99d8fde6-e561-47f0-9854-a35d42edfd26
Idrus, Farah
62a8fa26-5e6c-46c0-a231-975da8419a27
Roberts, Keiron
0422e8bc-1823-4a2c-bc80-98d6d2f9c166
Castrillejo, Maxi
325bb6c1-4b36-4f1d-bfbf-deda63ffa535
Statham, Peter J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Fones, Gary R.
304f9c63-0e4d-4b0b-9240-8a9e8dd2bf85
Planquette, Hélène
99d8fde6-e561-47f0-9854-a35d42edfd26
Idrus, Farah
62a8fa26-5e6c-46c0-a231-975da8419a27
Roberts, Keiron
0422e8bc-1823-4a2c-bc80-98d6d2f9c166

Castrillejo, Maxi, Statham, Peter J., Fones, Gary R., Planquette, Hélène, Idrus, Farah and Roberts, Keiron (2013) Dissolved trace metals (Ni, Zn, Co, Cd, Pb, Al, and Mn) around the Crozet Islands, Southern Ocean. Journal of Geophysical Research: Oceans, 118 (10), 5188-5201. (doi:10.1002/jgrc.20359).

Record type: Article

Abstract

A phytoplankton bloom shown to be naturally iron (Fe) induced occurs north of the Crozet Islands (Southern Ocean) every year, providing an ideal opportunity to study dissolved trace metal distributions within an island system located in a high nutrient low chlorophyll (HNLC) region. We present water column profiles of dissolved nickel (Ni), zinc (Zn), cobalt (Co), cadmium (Cd), lead (Pb), aluminium (Al), and manganese (Mn) obtained as part of the NERC CROZEX program during austral summer (2004–2005). Two stations (M3 and M1) were sampled downstream (north) of Crozet in the bloom area and near the islands, along with a control station (M2) in the HNLC zone upstream (south) of the islands. The general range found was for Ni, 4.64–6.31 nM; Zn, 1.59–7.75 nM; Co, 24–49 pM; Cd, 135–673 pM; Pb, 6–22 pM; Al, 0.13–2.15 nM; and Mn, 0.07–0.64 nM. Vertical profiles indicate little island influence to the south with values in the range of other trace metal deprived regions of the Southern Ocean. Significant removal of Ni and Cd was observed in the bloom and Zn was moderately correlated with reactive silicate (Si) indicating diatom control over the internal cycling of this metal. Higher concentrations of Zn and Cd were observed near the islands. Pb, Al, and Mn distributions also suggest small but significant atmospheric dust supply particularly in the northern region.

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More information

Published date: October 2013
Keywords: Southern Ocean, trace metals, biogeochemical cycles, iron fertilization
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 360798
URI: https://eprints.soton.ac.uk/id/eprint/360798
ISSN: 2169-9275
PURE UUID: 241683ca-a438-4823-bb35-0368ed985339

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Date deposited: 23 Dec 2013 11:48
Last modified: 13 Feb 2018 17:32

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