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Sediment-Water column coupling and the fate of the spring phytoplankton bloomin loch Linnhe, a Scottish fjordic sea-loch.Sediment processes and sediment - water fluxes

Sediment-Water column coupling and the fate of the spring phytoplankton bloomin loch Linnhe, a Scottish fjordic sea-loch.Sediment processes and sediment - water fluxes
Sediment-Water column coupling and the fate of the spring phytoplankton bloomin loch Linnhe, a Scottish fjordic sea-loch.Sediment processes and sediment - water fluxes
Sediment-water fluxes of oxygen and nutrients before and after the impact of the spring phytoplankton bloom were measured by core incubation experiments. Less than 10 days after the bloom had settled, chlorophyll was found down to a depth of 2 cm in the sediment. This rapid burial was probably due to mixing during resuspension events. There was some increase in oxygen uptake by the sediment after settlement of the bloom and a concomitant increase in the apparent oxygen diffusion coefficient; this latter increase may indicate a stimulation of bio-irrigation. There was a nitrate influx after settlement of the bloom, but no measurable efflux of ammonium or phosphate from the sediment. There was no increase of sulphate reduction activity after the impact of the bloom nor was solid-phase extractable manganese used as an alternative terminal electron acceptor for oxidation of carbon. We conclude that much of the readily biodegradable organic components of the bloom was mineralized in the water column during sediment resuspension events.

nutrient flux, oxygen flux, sulphate reduction, manganese
0272-7714
1-19
Overnell, J.
20d0e7f1-3044-47cc-a5cb-2eebe45db06d
Edwards, A.
59c01056-ed68-421d-9535-a5c77f3dd0ec
Grantham, B.E.
921ab39d-10f4-4310-a580-75d9669e3a8a
Harvey, S.M.
f265bd07-1159-4d28-bca2-936082a0eed0
Jones, K.J.
792f0134-953f-4f6e-a262-a9e54caeadb1
Leftley, J.W.
f36dbe45-7867-491f-ac10-45a63097e259
Smallman, D.J.
b619a7d9-6214-407f-9e95-67b0c4bc7278
Overnell, J.
20d0e7f1-3044-47cc-a5cb-2eebe45db06d
Edwards, A.
59c01056-ed68-421d-9535-a5c77f3dd0ec
Grantham, B.E.
921ab39d-10f4-4310-a580-75d9669e3a8a
Harvey, S.M.
f265bd07-1159-4d28-bca2-936082a0eed0
Jones, K.J.
792f0134-953f-4f6e-a262-a9e54caeadb1
Leftley, J.W.
f36dbe45-7867-491f-ac10-45a63097e259
Smallman, D.J.
b619a7d9-6214-407f-9e95-67b0c4bc7278

Overnell, J., Edwards, A., Grantham, B.E., Harvey, S.M., Jones, K.J., Leftley, J.W. and Smallman, D.J. (1995) Sediment-Water column coupling and the fate of the spring phytoplankton bloomin loch Linnhe, a Scottish fjordic sea-loch.Sediment processes and sediment - water fluxes. Estuarine, Coastal and Shelf Science, 41 (1), 1-19. (doi:10.1006/ecss.1995.0050).

Record type: Article

Abstract

Sediment-water fluxes of oxygen and nutrients before and after the impact of the spring phytoplankton bloom were measured by core incubation experiments. Less than 10 days after the bloom had settled, chlorophyll was found down to a depth of 2 cm in the sediment. This rapid burial was probably due to mixing during resuspension events. There was some increase in oxygen uptake by the sediment after settlement of the bloom and a concomitant increase in the apparent oxygen diffusion coefficient; this latter increase may indicate a stimulation of bio-irrigation. There was a nitrate influx after settlement of the bloom, but no measurable efflux of ammonium or phosphate from the sediment. There was no increase of sulphate reduction activity after the impact of the bloom nor was solid-phase extractable manganese used as an alternative terminal electron acceptor for oxidation of carbon. We conclude that much of the readily biodegradable organic components of the bloom was mineralized in the water column during sediment resuspension events.

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More information

Published date: July 1995
Keywords: nutrient flux, oxygen flux, sulphate reduction, manganese

Identifiers

Local EPrints ID: 74614
URI: https://eprints.soton.ac.uk/id/eprint/74614
ISSN: 0272-7714
PURE UUID: b2e4264b-a711-4d5b-abe6-1c1673989d06

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:45

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