Flow-induced flushing of relict tube structures in the central Skagerrak (Norway) |
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Authors: | N Munksby M Benthien R N Glud |
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Institution: | 1. Marine Biological Laboratory, University of Copenhagen, Strandpromentaden S, 3000, Helsing?r, Denmark
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Abstract: | Measurements of the O2 microdistribution around relict tubes of the polychaete Spiochaetopterus bergensis revealed an intense passive flushing of the tube structure if exposed to ambient flow. Flushing induced plumes, several microliters
large, of O2-undersaturated water that spread downstream in a flow-dependent manner. The plume induced a very irregular interstitial O2 distribution around the tubes, with suboxic microniches. Mass balance calculations based on the measured exchange rates estimated
the flushing rate of the relict tubes to be on the order of 5–11 μl tube−1 min−1 at the applied flow rates; this strongly enhanced the benthic solute exchange in the area. Given the high density of several
thousand tubes per square meter in the central Skagerrak, this flushing rate has profound effects on the biogeochemistry of
the otherwise impermeable sediment, which is unique in the sense that benthic diagenesis is completely dominated by manganese
oxidation.
Published online: 22 August 2002 |
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