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Organic matter controls of iron incorporation in growing sea ice
Citation
Janssens, J and Meiners, KM and Townsend, AT and Lannuzel, D, Organic matter controls of iron incorporation in growing sea ice, Frontiers in Earth Science, 6 Article 22. ISSN 2296-6463 (2018) [Refereed Article]
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Copyright Statement
Copyright 2018 Janssens, Meiners, Townsend and Lannuzel. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
DOI: doi:10.3389/feart.2018.00022
Abstract
This study presents the first laboratory-controlled sea-ice growth experiment conducted
under trace metal clean conditions. The role played by organic matter in the incorporation
of iron (Fe) into sea ice was investigated by means of laboratory ice-growth experiments
using a titanium cold-finger apparatus. Experiments were also conducted to understand
the role of extracellular polymeric substances (EPS) in the enrichment of ammonium in
sea ice. Sea ice was grown from several seawater solutions containing different quantities
and qualities of particulate Fe (PFe), dissolved Fe (DFe) and organic matter. Sea ice and
seawater were analyzed for particulate organic carbon and nitrogen, macro-nutrients,
EPS, PFe, and DFe, and particulate aluminum. The experiments showed that biogenic
PFe is preferentially incorporated into sea ice compared to lithogenic PFe. Furthermore,
sea ice grown from ultra-violet (UV) and non-UV treated seawaters exhibits contrasting
incorporation rates of organic matter and Fe. Whereas, the effects of UV-treatments were
not always significant, we do find indications that the type or organic matter controls
the enrichment of Fe in forming sea ice. Specifically, we come to the conclusion that
the incorporation of DFe is favored by the presence of organic ligands in the source
solution.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | sea ice, organic matter, iron, Antarctica, EPS, organic ligands, incorporation |
| Research Division: | Earth Sciences |
| Research Group: | Oceanography |
| Research Field: | Chemical Oceanography |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding Knowledge |
| Objective Field: | Expanding Knowledge in the Earth Sciences |
| UTAS Author: | Janssens, J (Miss Julie Janssens) |
| UTAS Author: | Meiners, KM (Dr Klaus Meiners) |
| UTAS Author: | Townsend, AT (Associate Professor Ashley Townsend) |
| UTAS Author: | Lannuzel, D (Associate Professor Delphine Lannuzel) |
| ID Code: | 130924 |
| Year Published: | 2018 |
| Web of Science® Times Cited: | 1 |
| Deposited By: | Oceans and Cryosphere |
| Deposited On: | 2019-02-20 |
| Last Modified: | 2019-03-12 |
| Downloads: | 43 View Download Statistics |
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