In situ study of bromide tracer and oxygen flux in coastal sediments

Stefan Forster, R. N. Glud, J. K. Gundersen, M. Huettel

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Laboratory and in situ experiments were performed to assess the use of bromide as a tracer for in situ studies of benthic solute exchange. Bromide was used in the benthic chamber lander 'Elinor' for flux measurements in coastal sediments of the German Bight, Kiel Bight and Skagerrak (28-700 m water depth). Tracer and total oxygen uptake were monitored simultaneously in the same chamber incubation. Concurrently, in situ oxygen micro-profiles were recorded at the same locations by the profiling lander 'Profilur'. Deployment in an anoxic silt (Kiel Bight) confirmed that in the absence of bioturbation and advection, tracer transport into the sediment was driven solely by molecular diffusion. This flux could be well described by a simple box model accounting for molecular diffusion only. In oxic sediments (German Bight and Skagerrak) enhanced exchange of bromide tracer due to bioirrigation parallelled enhanced oxygen uptake equivalent to a 4-fold molecular diffusive flux. Our experiments showed that incubations can be short. Depending on irrigation activity of the fauna, however, incubation length should exceed 3 h in order to provide a useful data base for flux calculations. The method demonstrating caveats is discussed and indicate possible improvements. The results show how the bromide tracer addition can be used as a tool for determining solute fluxes exceeding diffusive flux in benthic chamber incubations.

OriginalsprogEngelsk
TidsskriftEstuarine, Coastal and Shelf Science
Vol/bind49
Udgave nummer6
Sider (fra-til)813-827
Antal sider15
ISSN0272-7714
DOI
StatusUdgivet - dec. 1999
Udgivet eksterntJa

Fingeraftryk

coastal sediment
bromides
bromide
tracer techniques
tracer
oxygen
sediments
incubation
solutes
solute
oxic sediment
bioturbation
sediment transport
flux measurement
silt
water depth
advection
experiment
in situ
fauna

Citer dette

Forster, Stefan ; Glud, R. N. ; Gundersen, J. K. ; Huettel, M. / In situ study of bromide tracer and oxygen flux in coastal sediments. I: Estuarine, Coastal and Shelf Science. 1999 ; Bind 49, Nr. 6. s. 813-827.
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abstract = "Laboratory and in situ experiments were performed to assess the use of bromide as a tracer for in situ studies of benthic solute exchange. Bromide was used in the benthic chamber lander 'Elinor' for flux measurements in coastal sediments of the German Bight, Kiel Bight and Skagerrak (28-700 m water depth). Tracer and total oxygen uptake were monitored simultaneously in the same chamber incubation. Concurrently, in situ oxygen micro-profiles were recorded at the same locations by the profiling lander 'Profilur'. Deployment in an anoxic silt (Kiel Bight) confirmed that in the absence of bioturbation and advection, tracer transport into the sediment was driven solely by molecular diffusion. This flux could be well described by a simple box model accounting for molecular diffusion only. In oxic sediments (German Bight and Skagerrak) enhanced exchange of bromide tracer due to bioirrigation parallelled enhanced oxygen uptake equivalent to a 4-fold molecular diffusive flux. Our experiments showed that incubations can be short. Depending on irrigation activity of the fauna, however, incubation length should exceed 3 h in order to provide a useful data base for flux calculations. The method demonstrating caveats is discussed and indicate possible improvements. The results show how the bromide tracer addition can be used as a tool for determining solute fluxes exceeding diffusive flux in benthic chamber incubations.",
keywords = "Bioturbation, Bromide tracer, In situ flux, Irrigation, Lander, North Sea, Oxygen",
author = "Stefan Forster and Glud, {R. N.} and Gundersen, {J. K.} and M. Huettel",
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In situ study of bromide tracer and oxygen flux in coastal sediments. / Forster, Stefan; Glud, R. N.; Gundersen, J. K.; Huettel, M.

I: Estuarine, Coastal and Shelf Science, Bind 49, Nr. 6, 12.1999, s. 813-827.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - In situ study of bromide tracer and oxygen flux in coastal sediments

AU - Forster, Stefan

AU - Glud, R. N.

AU - Gundersen, J. K.

AU - Huettel, M.

PY - 1999/12

Y1 - 1999/12

N2 - Laboratory and in situ experiments were performed to assess the use of bromide as a tracer for in situ studies of benthic solute exchange. Bromide was used in the benthic chamber lander 'Elinor' for flux measurements in coastal sediments of the German Bight, Kiel Bight and Skagerrak (28-700 m water depth). Tracer and total oxygen uptake were monitored simultaneously in the same chamber incubation. Concurrently, in situ oxygen micro-profiles were recorded at the same locations by the profiling lander 'Profilur'. Deployment in an anoxic silt (Kiel Bight) confirmed that in the absence of bioturbation and advection, tracer transport into the sediment was driven solely by molecular diffusion. This flux could be well described by a simple box model accounting for molecular diffusion only. In oxic sediments (German Bight and Skagerrak) enhanced exchange of bromide tracer due to bioirrigation parallelled enhanced oxygen uptake equivalent to a 4-fold molecular diffusive flux. Our experiments showed that incubations can be short. Depending on irrigation activity of the fauna, however, incubation length should exceed 3 h in order to provide a useful data base for flux calculations. The method demonstrating caveats is discussed and indicate possible improvements. The results show how the bromide tracer addition can be used as a tool for determining solute fluxes exceeding diffusive flux in benthic chamber incubations.

AB - Laboratory and in situ experiments were performed to assess the use of bromide as a tracer for in situ studies of benthic solute exchange. Bromide was used in the benthic chamber lander 'Elinor' for flux measurements in coastal sediments of the German Bight, Kiel Bight and Skagerrak (28-700 m water depth). Tracer and total oxygen uptake were monitored simultaneously in the same chamber incubation. Concurrently, in situ oxygen micro-profiles were recorded at the same locations by the profiling lander 'Profilur'. Deployment in an anoxic silt (Kiel Bight) confirmed that in the absence of bioturbation and advection, tracer transport into the sediment was driven solely by molecular diffusion. This flux could be well described by a simple box model accounting for molecular diffusion only. In oxic sediments (German Bight and Skagerrak) enhanced exchange of bromide tracer due to bioirrigation parallelled enhanced oxygen uptake equivalent to a 4-fold molecular diffusive flux. Our experiments showed that incubations can be short. Depending on irrigation activity of the fauna, however, incubation length should exceed 3 h in order to provide a useful data base for flux calculations. The method demonstrating caveats is discussed and indicate possible improvements. The results show how the bromide tracer addition can be used as a tool for determining solute fluxes exceeding diffusive flux in benthic chamber incubations.

KW - Bioturbation

KW - Bromide tracer

KW - In situ flux

KW - Irrigation

KW - Lander

KW - North Sea

KW - Oxygen

U2 - 10.1006/ecss.1999.0557

DO - 10.1006/ecss.1999.0557

M3 - Journal article

AN - SCOPUS:0033370842

VL - 49

SP - 813

EP - 827

JO - Estuarine, Coastal and Shelf Science

JF - Estuarine, Coastal and Shelf Science

SN - 0272-7714

IS - 6

ER -