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  Benthic solute exchange and carbon mineralization in two shallow subtidal sandy sediments: Effect of advective pore-water exchange

Cook, P. L. M., Wenzhöfer, F., Glud, R. N., Janssen, F., & Hüttel, M. (2007). Benthic solute exchange and carbon mineralization in two shallow subtidal sandy sediments: Effect of advective pore-water exchange. Limnology and Oceanography, 52(5), 1943-1963.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-CE02-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-A0A1-D
Genre: Journal Article

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 Creators:
Cook, P. L. M.1, Author              
Wenzhöfer, F.1, Author              
Glud, R. N., Author
Janssen, F.1, Author              
Hüttel, M.2, Author              
Affiliations:
1HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481702              
2Flux Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481701              

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 Abstract: We conducted four field campaigns to evaluate benthic O2 consumption and the effect of advective pore‐water flow in nearshore permeable sediments in the North Sea and Baltic Sea. Advective pore‐water transport had a marked effect on the benthic exchange of O2 and TCO2 in benthic chamber incubations, with the rates of exchange increasing by a factor of up to 2.5 when imposing flushing rates of 100‐300 L m−2 d−1, compared to settings with diffusive exchange only. Estimates of in situ exchange rates using oxygen penetration and volumetric O2 consumption and TCO2 production rates were within the range measured in the chambers. The contribution of advection to solute exchange was highly variable and dependent on sediment topography. Advective processes also had a pronounced influence on the in situ distribution of O2 within the sediment, with characteristic two‐dimensional patterns of O2 distribution across ripples, and also deep subsurface O2 pools, being observed. Mineralization pathways were predominantly aerobic when benthic mineralization rates were low and advective pore‐water flow high as a result of well‐developed sediment topography. By contrast, mineralization proceeded predominantly through sulfate reduction when benthic mineralization rates were high and advective pore‐water flow low as a result of poorly developed topography. Previous studies of benthic mineralization in shallow sandy sediments have generally ignored these dynamics and, hence, have overlooked crucial aspects of permeable sediment function in coastal ecosystems.

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Language(s): eng - English
 Dates: 2007-09
 Publication Status: Published in print
 Pages: 21
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 343249
ISI: 000249416200018
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Title: Limnology and Oceanography
Source Genre: Journal
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Publ. Info: Waco, Tex., etc. : American Society of Limnology and Oceanography.
Pages: - Volume / Issue: 52 (5) Sequence Number: - Start / End Page: 1943 - 1963 Identifier: ISSN: 0024-3590
CoNE: https://pure.mpg.de/cone/journals/resource/954925421091