DescriptionOrganic matter supply to ocean sediments.png
English: Organic matter supply to sediments ocean
(1) Organic matter settling from the water column is deposited at seafloor (donor control; fixed flux upper boundary condition). (2) Sediments in the photic zone are inhabited by benthic microalgae that produce new organic matter in situ and grazing animals can impact the growth of these primary producers. (3) Bioturbating animals transfer labile carbon from the sediment surface layer to deeper layers in the sediments. (Vertical axis is depth; horizontal axis is concentration) (4) Suspension-feeding organisms enhance the transfer of suspended particulate matter from the water column to the sediments (biodeposition). (5) Sponge consume dissolved organic carbon and produce cellular debris that can be consumed by benthic organisms (i.e., the sponge loop).
Reference: Middelburg, J. J. (2018) "Reviews and syntheses: to the bottom of carbon processing at the seafloor", Biogeosciences, 15: 413–427. doi:10.5194/bg-15-413-2018
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