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Manganese dynamics in the water column of the upper basin of Loch Etive, a Scottish fjord

Manganese dynamics in the water column of the upper basin of Loch Etive, a Scottish fjord
Manganese dynamics in the water column of the upper basin of Loch Etive, a Scottish fjord
The concentrations of dissolved and particulate manganese and iron and of dissolved oxygen in the water column have been measured as a function of depth in the upper basin of Loch Etive, over a 17 month period. For most of this period the bottom water was isolated, which caused low dissolved oxygen concentrations within the water column and concomitant high levels of manganese. The highest concentrations of manganese were close to the bottom. During the study period an overturn event occurred which caused complete mixing of the water column, and flushing of the low oxygen, high manganese deep water. By using published rate constants for the oxidation of Mn2+ and by assuming steady state, we estimate that the oxidation of dissolved Mn2+ (and by implication the return of solid phase manganese to the sediment) occurred at the rate of 2.2-5.4 mmole m-2 d-1, on an areal basis during the period of isolation. Mn2+ efflux experiments gave values of 0.44 and 0.81 mmole m-2 d-1
manganese, iron, oxygen, oxidation, Scotland coast
481-492
Overnell, J.
20d0e7f1-3044-47cc-a5cb-2eebe45db06d
Brand, T.
225971b5-bac0-4881-8df7-252ba54d4051
Bourgeois, W.
318e2439-35a7-495a-8bd3-9d3b61081b56
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Overnell, J.
20d0e7f1-3044-47cc-a5cb-2eebe45db06d
Brand, T.
225971b5-bac0-4881-8df7-252ba54d4051
Bourgeois, W.
318e2439-35a7-495a-8bd3-9d3b61081b56
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c

Overnell, J., Brand, T., Bourgeois, W. and Statham, P.J. (2002) Manganese dynamics in the water column of the upper basin of Loch Etive, a Scottish fjord. Estuarine, Coastal and Shelf Science, 55 (3), 481-492. (doi:10.1006/ecss.2001.0919).

Record type: Article

Abstract

The concentrations of dissolved and particulate manganese and iron and of dissolved oxygen in the water column have been measured as a function of depth in the upper basin of Loch Etive, over a 17 month period. For most of this period the bottom water was isolated, which caused low dissolved oxygen concentrations within the water column and concomitant high levels of manganese. The highest concentrations of manganese were close to the bottom. During the study period an overturn event occurred which caused complete mixing of the water column, and flushing of the low oxygen, high manganese deep water. By using published rate constants for the oxidation of Mn2+ and by assuming steady state, we estimate that the oxidation of dissolved Mn2+ (and by implication the return of solid phase manganese to the sediment) occurred at the rate of 2.2-5.4 mmole m-2 d-1, on an areal basis during the period of isolation. Mn2+ efflux experiments gave values of 0.44 and 0.81 mmole m-2 d-1

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Published date: 2002
Keywords: manganese, iron, oxygen, oxidation, Scotland coast

Identifiers

Local EPrints ID: 6085
URI: http://eprints.soton.ac.uk/id/eprint/6085
PURE UUID: adb69ff2-5201-4b35-9994-bf24540cf5b0

Catalogue record

Date deposited: 10 Jun 2004
Last modified: 09 Nov 2021 06:07

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Contributors

Author: J. Overnell
Author: T. Brand
Author: W. Bourgeois
Author: P.J. Statham

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