Composition and distribution of dissolved carbohydrates in the Beaufort Sea Mackenzie Margin (Arctic Ocean)
作者： Christos Panagiotopoulos , Richard Sempéré , Violaine Jacq , Bruno Charrière
DOI: 10.1016/J.MARCHEM.2014.09.004
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摘要: Abstract The carbohydrate composition (TDCHO) of dissolved organic matter (DOM) was studied in the Mackenzie margin (southeast Beaufort Sea) summer 2009 as a part MALINA project. Sampling performed shelf (bottom depth ≤ 100 m), slope (100 m 1000 m) areas margin. Our results showed that sugar concentrations did not follow carbon (DOC) patterns, which decreased from to basin stations (from 115 65 μM), but instead remained rather constant (965–900 nM), indicating an accumulation carbohydrates surface waters (0–80 m). TDCHO exhibited their highest values (> 1000 nM) and higher relative abundance DOC central sector area, especially zone between 130 135°W differences distribution broader area possible various sources. represented 6 ± 2% 8 ± 3% (TDCHO-C/DOC) for stations, respectively. Semi-labile estimated accounted 10–40% 20–50% agreed well with above TDCHO/DOC suggesting gradient freshness inshore offshore stations. high fucose + rhamnose abundances (Fuc. + Rha. 15–18%) C/N ratios (19–13) recorded are indicative soil-derived delivered by River, possibly contributions mainly gymnosperm terrestrial plants. glucose (up 50%) suggests component DOM appears have more pronounced marine autochthonous origin important contribution sources, Overall, these suggest largely uniform within occasional patches lower concentrations.
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