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  Hydrodynamic control of sediment-water fluxes: Consistent parameterization and impact in coupled benthic-pelagic models

Umlauf, L., Klingbeil, K., Radke, H., Schwefel, R., Bruggeman, J., Holtermann, P. (2023): Hydrodynamic control of sediment-water fluxes: Consistent parameterization and impact in coupled benthic-pelagic models, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4115

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021554 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021554_1
Genre: Conference Paper

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 Creators:
Umlauf, Lars1, Author
Klingbeil, Knut1, Author
Radke, Hagen1, Author
Schwefel, Robert1, Author
Bruggeman, Jorn1, Author
Holtermann, Peter1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Benthic oxygen dynamics and the exchange of oxygen and other solutes across the sedimentwater interface play a key role for the oxygen budget of many limnic and shallow marine systems. The sediment-water fluxes are largely determined by two factors: sediment biogeochemistry and the thickness of the diffusive boundary layer that is determined by near-bottom turbulence. Here, we present a fully coupled benthic-pelagic modeling system that takes these processes and their interaction into account, focusing especially on the modulation of the sediment-water fluxes by the effects of near-bottom turbulence and stratification. We discuss the special numerical methods required to guarantee positivity and mass conservation across the sediment-water interface in the presence of rapid element transformation, and apply this modeling system to a number of idealized scenarios. Our process-oriented simulations show that near-bottom turbulence provides a crucial control on the sediment-water fluxes, the oxygen penetration depth, and the re-oxidation of reduced compounds diffusing upward from the deeper benthic layers especially on time scales of a few days, characterizing oceanic tides,internal seiching motions in lakes, and mesoscale atmospheric variability. Our results also show that the response of benthic-pelagic fluxes to rapid changes in the forcing conditions (e.g., storm events) can only be understood with a fully coupled modeling approach.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
 Pages: -
 Publishing info: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-4115
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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