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Author |
Thomas, D.N.; Kennedy, H.; Kattner, G.; Gerdes, D.; Gough, C.; Dieckmann, G.S. |
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Title |
Biogeochemistry of platelet ice: its influence on particle flux under fast ice in the Weddell Sea, Antarctica |
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Journal Article |
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Year |
2001 |
Publication  |
Polar Biology |
Abbreviated Journal |
Polar Biol |
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Volume |
24 |
Issue |
7 |
Pages |
486-496 |
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Abstract |
An array of four sediment traps and one current meter was deployed under a well-developed platelet layer for 15 days in the Drescher Inlet in the Riiser Larsen ice shelf, in February 1998. Traps were deployed at 10 m (just under the platelet layer), 112 m (above the thermocline), 230 m (below thermocline) and 360 m (close to sea floor). There was a substantial flux of particulate organic material out of the platelet layer, although higher amounts were collected in the traps either side of the thermocline. Material collected was predominantly composed of faecal pellets containing diatom species growing within the platelet layer. The size classes of these pellets suggest they derive from protists grazing rather than from larger metazoans. Sediment trap material was analysed for particulate organic carbon/nitrogen/phosphorus (POC/PON/POP) and ?¹³CPOC (carbon isotopic composition of POC). These were compared with organic matter in the overlying platelet layer and the water column. In turn, the biogeochemistry of the platelet layer and water column was investigated and the organic matter characteristics related to inorganic nutrients (nitrate, nitrite, ammonium, silicate, phosphate), dissolved organic carbon/nitrogen (DOC/DON), pH, dissolved inorganic carbon (DIC), oxygen and ?¹³CDIC (carbon isotopic composition dissolved inorganic carbon). |
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Springer-Verlag |
Place of Publication |
Heidelberg |
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ISSN |
0722-4060 |
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no |
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Call Number |
refbase @ admin @ Thomas++2001_2 |
Serial |
762 |
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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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Springer-Verlag |
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Heidelberg |
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0722-4060 |
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D |
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Call Number |
refbase @ admin @ Thomas++1995 |
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763 |
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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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Pages |
80-87 |
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International Glaciological Society |
Place of Publication |
Cambridge |
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Series Title |
Annals of Glaciology |
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Series Volume |
44 |
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Call Number |
refbase @ admin @ Steffens2006 |
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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 |
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Pages |
80-87 |
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International Glaciological Society |
Place of Publication |
Cambridge |
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Series Title |
Annals of Glaciology |
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Series Volume |
44 |
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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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Publisher |
International Glaciological Society |
Place of Publication |
Cambridge |
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Original Title |
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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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Notes |
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no |
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Call Number |
refbase @ admin @ Steffens2006 |
Serial |
17407 |
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