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Author |
Steffens, M.; Granskog, M.A.; Kaartokallio, H.; Kuosa, H.; Luodekari, K.; Papadimitriou, S.; Thomas, D.N. |
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Title |
Spatial variation of biogeochemical properties of landfast sea ice in the Gulf of Bothnia, Baltic Sea |
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Conference Article |
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Year |
2006 |
Publication |
Proceedings of the International Symposium on Sea Ice, Dunedin (New Zealand), 5-9 Dec 2005 |
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Issue |
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Pages |
80-87 |
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Publisher |
International Glaciological Society |
Place of Publication |
Cambridge |
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Series Editor |
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Series Title |
Annals of Glaciology |
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Series Volume |
44 |
Series Issue |
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Call Number  |
refbase @ admin @ Steffens2006 |
Serial |
17385 |
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Author |
Steffens, M.; Granskog, M.A.; Kaartokallio, H.; Kuosa, H.; Luodekari, K.; Papadimitriou, S.; Thomas, D.N. |
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Title |
Spatial variation of biogeochemical properties of landfast sea ice in the Gulf of Bothnia, Baltic Sea |
Type |
Conference Article |
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Year |
2006 |
Publication |
Proceedings of the International Symposium on Sea Ice, Dunedin (New Zealand), 5-9 Dec 2005 |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
80-87 |
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Keywords |
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Abstract |
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Address |
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Corporate Author |
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Thesis |
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Publisher |
International Glaciological Society |
Place of Publication |
Cambridge |
Editor |
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Language |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
Annals of Glaciology |
Abbreviated Series Title |
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Series Volume |
44 |
Series Issue |
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Edition |
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ISSN |
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ISBN |
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Medium |
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Area |
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Expedition |
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Notes |
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Approved |
no |
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Call Number |
refbase @ admin @ Steffens2006 |
Serial |
17396 |
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Author |
Steffens, M.; Granskog, M.A.; Kaartokallio, H.; Kuosa, H.; Luodekari, K.; Papadimitriou, S.; Thomas, D.N. |
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Title |
Spatial variation of biogeochemical properties of landfast sea ice in the Gulf of Bothnia, Baltic Sea |
Type |
Conference Article |
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Year |
2006 |
Publication |
Proceedings of the International Symposium on Sea Ice, Dunedin (New Zealand), 5-9 Dec 2005 |
Abbreviated Journal |
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Volume |
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Issue |
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Pages |
80-87 |
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Keywords |
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Abstract |
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Address |
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Corporate Author |
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Thesis |
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Publisher |
International Glaciological Society |
Place of Publication |
Cambridge |
Editor |
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Language |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
Annals of Glaciology |
Abbreviated Series Title |
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Series Volume |
44 |
Series Issue |
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Edition |
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ISBN |
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Area |
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Notes |
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no |
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Call Number |
refbase @ admin @ Steffens2006 |
Serial |
17407 |
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Author |
Thomas, D.N.; Baumann, M.E.M.; Gleitz, M. |
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Title |
Efficiency of carbon assimilation and photoacclimation in a small unicellular Chaetoceros species from the Weddell Sea (Antarctica): Influence of temperature and irradiance |
Type |
Journal Article |
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Year |
1992 |
Publication |
Journal of Experimental Marine Biology and Ecology |
Abbreviated Journal |
J Exp Mar Biol Ecol |
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Volume |
157 |
Issue |
2 |
Pages |
195-209 |
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Keywords |
photosynthesis; Psw; Weddell Sea; Chaetoceros; temperature effects; irradiance; light effects; acclimation; respiration; carbon fixation; low temperature; polar waters; Antarctica; water temperature |
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Abstract |
It is well established that Antarctic phytoplankton and sea-ice algae are able to thrive at low temperatures and it has been proposed that a reduction in respiration may be important in enabling them to do this. This possibility was studied in an Antarctic clone of a small unicellular Chaetoceros species isolated from the Weddell Sea (Antarctica), using comparative measurements of C assimilation during long- and short-term incubation series over a range of temperatures (-1.5 to 4 °C) at two irradiances (5 and 55 µmol m?²/s). Even though doubling times varied considerably, the total amount of C assimilated per cell per generation time was similar at each of the temperature and light conditions. However, over one cell cycle, significant respiratory C losses were determined by divergences in C assimilation patterns between cumulative and long-term incubations at both light intensities at 0 and 4 °C. At -1.5 °C, insignificant C losses were recorded. No significant extracellular release of dissolved organic material (DOC) was observed. |
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Publisher |
Elsevier Science B.V. |
Place of Publication |
Amsterdam |
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Series Volume |
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Edition |
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ISSN |
0022-0981 |
ISBN |
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Notes |
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Approved |
no |
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Call Number |
refbase @ admin @ Thomas++1992 |
Serial |
757 |
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Author |
Thomas, D.N.; Lara, R.J.; Eicken, H.; Kattner, G.; Skoog, A. |
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Title |
Dissolved organic matter in Arctic multi-year sea ice during winter: major components and relationship to ice characteristics |
Type |
Journal Article |
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Year |
1995 |
Publication |
Polar Biology |
Abbreviated Journal |
Polar Biol |
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Volume |
15 |
Issue |
6 |
Pages |
447-483 |
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Keywords |
sea ice; Arctic; Dom |
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Abstract |
Ice cores were collected between 10.03.93 and 15.03.93 along a 200 m profile on a large ice floe in Fram Strait. The ice was typical of Arctic multi-year ice, having a mean thickness along the profile of 2.56 ±0.53 m. It consisted mostly of columnar ice (83%) grown through congelation of seawater at the ice bottom, and the salinity profiles were characterized by a linear increase from 0 psu at the top to values ranging between 3 and 5 psu at depth. Distributions of dissolved organic carbon (DOC) and nitrogen (DON) and major nutrients were compared with ice texture, salinity and chlorophyll a. DOC, DON, dissolved inorganic nitrogen (DIN), NH?? and NO?? were present in concentrations in excess of that predicted by dilution curves derived from Arctic surface water values. Only NO?? was depleted, although not exhausted. High DOC and DON values in conjunction with high NH?? levels indicated that a significant proportion of the dissolved organic matter (DOM) was a result of decomposition/grazing of ice algae and/or detritus. The combination of high NH?? and NO?? points to regeneration of nitrogen compounds. There was no significant correlation between DOC and Chl a in contrast to DON, which had a positively significant correlation with both salinity and Chl a, and the distribution of DOM in the cores might best be described as a combination of both physical and biological processes. There was no correlation between DOC and DON suggesting an uncoupling of DOC and DON dynamics in multi year ice. |
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Publisher |
Springer-Verlag |
Place of Publication |
Heidelberg |
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Original Title |
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Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Volume |
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Series Issue |
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Edition |
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ISSN |
0722-4060 |
ISBN |
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Notes |
D |
Approved |
no |
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Call Number |
refbase @ admin @ Thomas++1995 |
Serial |
763 |
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