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Distribution of dissolved and particulate metals in Antarctic sea ice
Citation
Lannuzel, D and Bowie, AR and Van Der Merwe, P and Townsend, AT and Schoemann, V, Distribution of dissolved and particulate metals in Antarctic sea ice, Marine Chemistry: An International Journal for Studies of All Chemical Aspects of The Marine Environment, 124, (1-4) pp. 134-146. ISSN 0304-4203 (2011) [Refereed Article]
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DOI: doi:10.1016/j.marchem.2011.01.004
Abstract
Samples were collected in East Antarctic sea ice in late winter/early austral spring 2007 to assess the
distributions of Al, Cr, Mn, Cu, Zn, Mo, Cd and Ba. Total dissolved (b0.2 ìm) and particulate (N0.2 ìm)
concentrations were measured by Inductively Coupled Plasma-Sector Field Mass Spectrometry (ICP-SFMS) in
snow, pack ice and fast ice. Particulate concentrations were also determined in underlying seawater for these
elements. The concentrations of particulate metals were one to two orders of magnitude higher in sea ice than
in snow and seawater, except for Mo and Cr. Barite maxima in sea ice vertical profiles at all sites may indicate
heterotrophic activity. Particulate Al and Mn distributions suggest a signal from Antarctica's shelf sediments.
Dissolved metals were one order of magnitude higher in sea ice as compared to snow, although they were not
enriched in sea ice as compared to data reported in the literature for Antarctic surface waters. An analysis of
dissolved-to-total metal ratios showed that all studied metals were found almost exclusively in the dissolved
phase in Antarctic pack ice. Dissolved metals distributions indicate that spatial variability does not seem to be
strong. Our results also demonstrate that dissolved Al, Cr, Mo and Ba behaved conservatively with bulk ice
salinity gradients. This would confirm the main source of trace metals to Antarctic sea ice comes from
seawater and not from direct atmospheric deposition. Dissolved bioactive metals Mn, Cu, Zn and Cd
concentrations were scattered when plotted against bulk ice salinity, but did not show a seasonal decrease nor
reach limitation status. Finally, seasonal ice melt does not seem to contribute significantly to the supply of
dissolved bioactive metals, other than Fe, to Antarctic surface waters.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | sea ice; metals; Antarctic |
| Research Division: | Earth Sciences |
| Research Group: | Oceanography |
| Research Field: | Chemical Oceanography |
| Objective Division: | Environment |
| Objective Group: | Other Environment |
| Objective Field: | Environment not elsewhere classified |
| UTAS Author: | Lannuzel, D (Associate Professor Delphine Lannuzel) |
| UTAS Author: | Bowie, AR (Professor Andrew Bowie) |
| UTAS Author: | Van Der Merwe, P (Dr Pier van der Merwe) |
| UTAS Author: | Townsend, AT (Associate Professor Ashley Townsend) |
| UTAS Author: | Schoemann, V (Dr Veronique Schoemann) |
| ID Code: | 76022 |
| Year Published: | 2011 |
| Funding Support: | Australian Research Council (DP0985361) |
| Web of Science® Times Cited: | 43 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2012-02-22 |
| Last Modified: | 2018-03-28 |
| Downloads: | 1 View Download Statistics |
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