Pigments in sediments beneath recently collapsed ice shelves: The case of Larsen A and B shelves,Antarctic Peninsula |
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| Authors: | E Sañé E Isla A Grémare J Gutt G Vétion DJ DeMaster |
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| Institution: | 1. Instituto de Ciencias del Mar-CSIC, Paseo Marítimo de la Barceloneta 37-49, 08003 Barcelona, Spain;2. UMR EPOC, Université Bordeaux 1- CNRS, Station Marine d''Arcachon, 2 Rue du Professeur Jolyet 33120 Arcachon, France;3. Alfred Wegener Institute for Polar and Marine Research, 27568 Bremerhaven, Columbusstr., Germany;4. Laboratoire Arago, F-66650 Banyuls/mer, France;5. Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695-8208, USA;1. Royal Netherlands Institute for Sea Research (NIOZ), Department of Marine Ecology, P.O. Box 59, NL-1790 AB Den Burg, The Netherlands;2. Alfred Wegener Institute for Polar and Marine Research (AWI), Wadden Sea Station Sylt, D-25992 List, Germany;1. National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Alaska Fisheries Science Center, 7600 Sand Point Way NE, Seattle, WA 98115, USA;2. Institute of Marine Science, University of Alaska Fairbanks, Fairbanks, AK 99775, USA;1. College of Marine Life Sciences, Ocean University of China, Qingdao, 266100, China;2. College of Geography and Environment, Shandong Normal University, Jinan, 250000, China;3. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;4. School of Life Science, Central South University, Changsha, 410000, China;5. Emory School of Medicine, Emory University, Atlanta, GA, 30322, USA;1. University of Wisconsin-Madison, 550 N. Park St., Madison, WI 53703, USA;2. Brown University, 324 Brook St., Providence, RI 02912, USA;3. U.S. Geological Survey, Department of the Interior Southwest Climate Science Center, University of Arizona, 1064 E. Lowell St., Tucson, AZ 85721, USA;4. Limnological Research Center, 500 Pillsbury Dr. SE, Minneapolis, MN 55455, USA;5. University of Cincinnati, 500 Geology/Physics Building, Cincinnati, OH 45221, USA;1. The University of Arizona Department of Geosciences, 1040 E 4th St, Tucson, AZ 85721, USA;2. The University of Arizona School of Natural Resources and the Environment, 1064 E Lowell St, Tucson, AZ 85721, USA |
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| Abstract: | In March 2002, 3200 km2 of the Larsen B ice shelf collapsed off the Eastern Antarctic Peninsula (EAP). In the austral summer of 2006, sea floor sediment was recovered beneath the extinct Larsen B ice shelf and in a region off the Northern Antarctic Peninsula (NAP), which has been free of ice shelves for more than 1000 yr. To assess changes in the chemical composition of the sediment after ice shelf collapses, chlorophylls and pheophytins were measured in sediment cores at six stations. This is the first time that chlorophyll pigments have been analysed in sediment samples from regions under recently collapsed ice shelves. Five years after the ice shelf collapse, Chla and Chlc concentrations were similar in the interfacial sediment (upper 1 cm) of NAP and EAP regions. However, in EAP Chla and Chlc concentrations decreased more rapidly with depth in the sediment column and were negligible below 2 cm depth. The high Chla to Pheoa ratios indicated that sedimentary pigments found in EAP had undergone limited degradation suggesting that they were locally produced rather than laterally advected. Complementary information from excess 210Pb activity and diatom valve distributions provided further evidence that the pigment fluxes to the seabed in EAP took place only after the ice shelf collapse. |
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