Distribution and characterization of dissolved and particulate organic matter in Antarctic pack ice |
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| Authors: | I Dumont V Schoemann D Lannuzel L Chou J-L Tison S Becquevort |
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| Institution: | 1.Ecologie des Systèmes Aquatiques, Faculté des Sciences,Université Libre de Bruxelles,Brussels,Belgium;2.Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Faculté des Sciences,Université Libre de Bruxelles,Brussels,Belgium;3.Unité de Glaciologie, Faculté des Sciences,Université Libre de Bruxelles,Brussels,Belgium;4.Antarctic Climate and Ecosystems CRC,University of Tasmania,Hobart,Australia |
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| Abstract: | Distribution and composition of organic matter were investigated in Antarctic pack ice in early spring and summer. Accumulation
of organic compounds was observed with dissolved organic carbon (DOC) and particulate organic carbon (POC) reaching 717 and
470 μM C, respectively and transparent exopolymeric particles (TEP) up to 3,071 μg Xanthan gum equivalent l−1. POC and TEP seemed to be influenced mainly by algae. Particulate saccharides accounted for 0.2–24.1% (mean, 7.8%) of POC.
Dissolved total saccharides represented 0.4–29.6% (mean, 9.7%) of DOC, while dissolved free amino acids (DFAA) accounted for
only 1% of DOC. Concentrations of TEP were positively correlated with those of saccharides. Monosaccharides (d-MCHO) dominated
during winter–early spring, whereas dissolved polysaccharides did in spring–summer. DFAA were strongly correlated with d-MCHO,
suggesting a similar pathway of production. The accumulation of monomers in winter is thought to result from limitation of
bacterial activities rather than from the nature of the substrates. |
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| Keywords: | Sea ice Organic carbon Monosaccharides Polysaccharides Amino acids TEP |
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