Journal
MARINE CHEMISTRY
Volume 107, Issue 4, Pages 475-485Publisher
ELSEVIER
DOI: 10.1016/j.marchem.2007.09.002
Keywords
dissolved carbohydrates; polysaccharides; monosaccharides; Chl a; dissolved organic carbon (DOC); high latitude; seasonal variation; 66 degrees N; 2 degrees E
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Water samples were collected monthly for 3 years at 66 degrees N, 2 degrees E in the Norwegian Sea, 250 nautical miles off the Norwegian coast. Concentrations of mono- and polysaccharides were measured with the 2,4,6-tripyridyl-s-triazine (TPTZ) spectroscopic method. Total dissolved carbohydrates varied from 3.4 to 28.2 mu M C of all samples and the ratio of carbohydrate to dissolved organic C (DOC) varied from an average of 14% at 0-25 m depth to 11% at 800-2000 m depth. This indicates that dissolved carbohydrates were a significant constituent of DOC in the Norwegian Sea. Polysaccharides varied from 0.4 to 21.5 mu M C and monosaccharides from 0.7 to 11.7 mu M C at all depths. The level of monosaccharides was relatively constant at 2.8-3.2 mu M C below the euphotic zone, whereas polysaccharides showed more varying concentrations. Dissolved carbohydrates accumulated during the productive season, reaching maximum concentrations during summer although interannual differences were observed. A significant positive correlation between Chl a and soluble carbohydrate was found in one growing season with nutrient analyses. Average values for total carbohydrates were highest in the surface - 0 to 25 m - with 13.3 mu M C and decreased to 8.4 mu M C at 800-2000 m depth. The ratio of monosaccharides to polysaccharides exhibited a marked seasonal variation, increased from January to a maximum in June of 1.1, and declined to 0.5 in July. (c) 2007 Elsevier B.V. All rights reserved.
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