Biogeochemistry of platelet ice: its influence on particle flux under fast ice in the Weddell Sea, Antarctica
Thomas, D.N.; Kennedy, H.; Kattner, G.; Gerdes, D.; Gough, C.; Dieckmann, G.S. (2002). Biogeochemistry of platelet ice: its influence on particle flux under fast ice in the Weddell Sea, Antarctica, in: Arntz, W.E. et al. (Ed.) Ecological studies in the Antarctic sea ice zone: results of EASIZ Midterm Symposium. pp. 169-179 In: Arntz, W.E.; Clarke, A. (Ed.) (2002). Ecological studies in the Antarctic sea ice zone: Results of EASIZ Midterm Symposium. Springer: Berlin. ISBN 3-540-43218-3. 277 pp., more Related to:Thomas, D.N.; Kennedy, H.; Kattner, G.; Gerdes, D.; Gough, C.; Dieckmann, G.S. (2001). Biogeochemistry of platelet ice: its influence on particle flux under fast ice in the Weddell Sea, Antarctica. Polar Biol. 24(7): 486-496. https://dx.doi.org/10.1007/s003000100243, more |
| Keywords | Chemistry > Geochemistry > Biogeochemistry
Excretory products > Faecal pellets
Ice > Sea ice
Organic matter > Particulates > Particulate organic matter
Particulate flux
Sediment traps
PSW, Weddell Sea [Marine Regions]
Marine/Coastal |
| Authors | | Top | - Thomas, D.N.
- Kennedy, H.
- Kattner, G.
| - Gerdes, D.
- Gough, C.
- Dieckmann, G.S.
| |
| 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 δ13CPOC (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 δ13CDIC (carbon isotopic composition dissolved inorganic carbon). |
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