Anaerobic oxidation of methane and sulphate reduction rates, hydrocarbons, sulphate and sulphide concentrations of sediment cores from the Larsen B embayment at the eastern site of the Antarctic Peninsula ...

First videographic indication of an Antarctic cold seep ecosystem was recently obtained from the collapsed Larsen B ice shelf, western Weddell Sea (Domack et al., 2005). Within the framework of the R/V Polarstern expedition ANTXXIII-8, we revisited this area for geochemical, microbiological and furt...

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Bibliographic Details
Main Authors: Niemann, Helge, Fischer, David, Graffe, Dorothea, Knittel, Katrin, Montiel, Américo, Heilmayer, Olaf, Nöthen, Kerstin, Pape, Thomas, Kasten, Sabine, Bohrmann, Gerhard, Boetius, Antje, Gutt, Julian
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2009
Subjects:
Gravity corer
MultiCorer
ANT-XXIII/8
Polarstern
Census of Antarctic Marine Life CAML
Center for Marine Environmental Sciences MARUM
Antarc*
Antarctic
Antarctic Peninsula
Antarctica
Ice Shelf
Weddell Sea
Online Access:https://dx.doi.org/10.1594/pangaea.745450
https://doi.pangaea.de/10.1594/PANGAEA.745450
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Summary:First videographic indication of an Antarctic cold seep ecosystem was recently obtained from the collapsed Larsen B ice shelf, western Weddell Sea (Domack et al., 2005). Within the framework of the R/V Polarstern expedition ANTXXIII-8, we revisited this area for geochemical, microbiological and further videographical examinations. During two dives with ROV Cherokee (MARUM, Bremen), several bivalve shell agglomerations of the seep-associated, chemosynthetic clam Calyptogena sp. were found in the trough of the Crane and Evans glacier. The absence of living clam specimens indicates that the flux of sulphide and hence the seepage activity is diminished at present. This impression was further substantiated by our geochemical observations. Concentrations of thermogenic methane were moderately elevated with 2 µM in surface sediments of a clam patch, increasing up to 9 µM at a sediment depth of about 1 m in the bottom sections of the sediment cores. This correlated with a moderate decrease in sulphate from about 28 ... : Supplement to: Niemann, Helge; Fischer, David; Graffe, Dorothea; Knittel, Katrin; Montiel, Américo; Heilmayer, Olaf; Nöthen, Kerstin; Pape, Thomas; Kasten, Sabine; Bohrmann, Gerhard; Boetius, Antje; Gutt, Julian (2009): Biogeochemistry of a low-activity cold seep in the Larsen B area, western Weddell Sea, Antarctica. Biogeosciences, 6, 2383-2395 ...

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