HR: 1340h
AN: OS43A-0994    [Abstracts]
TI: Benthic Oxygen Dynamics and Organic Matter Turn Over in the Deep Arctic Ocean
AU: * Tengberg, A
EM: anderste@chem.gu.se
AF: Goteborg University, Department of Chemistry, Kemivagen 4, Goteborg, 41296, Sweden
AU: Nilsson, M
EM: madeleine.nilsson@gmail.com
AF: Goteborg University, Department of Chemistry, Kemivagen 4, Goteborg, 41296, Sweden
AU: Hall, P
EM: perhall@chem.gu.se
AF: Goteborg University, Department of Chemistry, Kemivagen 4, Goteborg, 41296, Sweden
AB: We used autonomous bottom landers equipped with a suite of instruments and sensors to study the benthic degradation rates of organic matter in-situ in the Fram strait (between Greenland and Spitsbergen). We occupied stations on a depth gradient reaching from the 1200 m, over 2500 m to the deepest area in the Arctic Ocean (Molloy Deep 5600 m). Preliminary results of oxygen uptake and efflux of CT give lower degradation rates at the intermediate depth stations than at the deeper and shallower. Even at 2500 m dissolved oxygen concentrations in the bottom water were surprisingly variable and oscillated with up to 10 µM over time scales of hours and with up to 30 µM over monthly time scales.
DE: 0408 Benthic processes (4804)
DE: 0428 Carbon cycling (4806)
DE: 0470 Nutrients and nutrient cycling (4845, 4850)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting