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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. (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
In: Polar Biology. Springer-Verlag: Berlin; Heidelberg. ISSN 0722-4060; e-ISSN 1432-2056, more
Related to:
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, more
Peer reviewed article  
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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