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Diatom valve distribution and sedimentary fatty acid composition in Larsen Bay, Eastern Antarctica Peninsula |
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| Authors: | E Sañé E IslaAM Pruski MA BárcenaG Vétion D DeMaster |
| Institution: | a Institut de Ciències del Mar-CSIC, Passeig Maritim de la Barceloneta 37-49, Barcelona E-08039, Spain b UPMC Univ Paris 06, FRE 3350, LECOB, Observatoire Océanologique, F-66651 Banyuls/mer, France c CNRS, FRE 3350, LECOB, Observatoire Océanologique, F-66651 Banyuls/mer, France d Depto. de Geología y Paleontología, Facultad de Ciencias, Universidad de Salamanca, 37008 Salamanca, Spain e Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695-8208, USA |
| Abstract: | During austral summer 2006-2007, five sediment cores were recovered from the Eastern Antarctic Peninsula (EAP) continental shelf. Microscopic observations and sediment fatty acid (FA) composition analyses were carried out to investigate whether the drastic changes at the sea surface in EAP may be reflected in the sedimentary record. A sharp decrease in the number of diatom valves was observed below 2 cm depth. This difference between the upper 2 cm of sediment and the deeper part of the sediment column was attributed to the drastic change in the upper water column conditions after the collapse of the ice shelves, which allowed the arrival of phytoplankton debris and fresh organic matter to the sea floor in EAP. The presence of bacterial-, zooplankton- and detrital-related FA throughout EAP cores suggests that there has been an input of older and more refractory organic matter into the region, presumably by lateral transport before the Larsen ice shelves disintegration. |
| Keywords: | Sedimentation Larsen ice shelf Antarctica Fatty acids Diatoms |
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