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Size fractionation and bioavailability of iron released from melting sea ice in a subpolar marginal sea

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Title: Size fractionation and bioavailability of iron released from melting sea ice in a subpolar marginal sea
Authors: Kanna, Naoya Browse this author
Lannuzel, Delphine Browse this author
van der Merwe, Pier Browse this author
Nishioka, Jun Browse this author →KAKEN DB
Keywords: Iron
Sea ice
Size fraction
Issue Date: 20-Apr-2020
Publisher: Elsevier
Journal Title: Marine chemistry
Volume: 221
Start Page: 103774
Publisher DOI: 10.1016/j.marchem.2020.103774
Abstract: We incubated Fe-limited seawater with sea-ice sections to evaluate which forms of iron (Fe) released from melting sea ice can favor phytoplankton growth. Biological availability (bioavailability) was approximated by fractionating Fe into soluble (<1000 kDa), colloidal (1000 kDa-0.2 mu m), and labile particulate (> 0.2 mu m) sizes. Results show that phytoplankton thrived after the addition of sea ice. While the labile particulate fraction dominated the total Fe pool in sea ice, the concentration of dissolved Fe (< 0.2 mu m) was likely not enough to support phytoplankton growth in seawater over time. The concentrations and molar ratios of Fe, Mn and Al in acid-digested particles indicate that particulate Fe in sea ice were derived from multiple origins. Specifically, the Fe to Al ratio in sea ice was higher than in lithogenic material, suggesting that the sea ice were enriched with biogenic material. Our study suggests that particulate Fe from sea ice should be considered an important source of biologically available Fe in ice-covered marginal seas.
Rights: ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 西岡 純

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