Resuspendable organic matter in nova scotian shelf and slope sediments

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Scientific paper

Sediment samples from the continental shelf and slope off Nova Scotia were fractionated with a combination of elutriation and sieving to investigate the most easily resuspended sediment fraction and thus processes of organic deposition. Bulk sediments on the slope were enriched in carbon and nitrogen compared to those on the shelf. Fractionation indicated that<40% of bulk particulate organic carbon (POC) and particulate organic nitrogen (PON) on the shelf (from a sandy bank and a muddy-sand basin) were readily resuspendable, reflecting the large proportion of sand at these stations. On the slope however, about 85% of the bulk POC and PON was resuspendable, due to the high silt-clay content. Resuspendable fractions at all stations did not differ significantly in organic content (i.e. richness). The similarity of these fine fractions, especially at basin and slope stations suggested a related origin (surface production) for these particles. The less resuspendable coarse fraction on the shelf was an organic-poor sand; on the slope the coarse fraction consisted of benthic fecal pellets, similar in richness to the fine fractions. Comparison of predicted and measured sedimentation rates suggested that enrichment of slope sediments could only be explained by horizontal transport of shelf production. This provides further support for the hypothesis that the continental slope is a sink in the global carbon budget.

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