Modelling of the Meromictic Fjord Hunnbunn (Norway) with an Oxygen Depletion Model (OxyDep)

Yakushev, E. V.; Debol’skaya, E. I.; Kuznetsov, Ivan; Staalstrøm, André

doi:10.1007/698_2011_110

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…The model was designed to run in the nested Hamburg Shelf Ocean Model (HAMSOM) model framework [27] and included a pollutant transport module that utilized modelled information for water transport and turbulent diffusion from previously performed long-term simulations [28], a biogeochemical module (Oxygen Depletion Model (OxyDep)) [29], and a pollutant partitioning module (PolPar). In the model framework, pollutants (1) can be transported with advection and turbulent diffusion, (2) get absorbed and released by particulate and dissolved organic matter, and (3) decay.…”

Section: Methods-model Descriptionmentioning

confidence: 99%

“…A schematic diagram of the biogeochemical processes that are considered in the OxyDep is shown in Figure 2. The model was described in detail in [29]. The 5 variables that were considered in the model can be described as follows:…”

Section: Modeling Biogeochemistry With Oxydepmentioning

confidence: 99%

“…Consequently, water phase concentrations decline in the proximity of the seafloor due to burial in the sediments (modified on the base of an approach used in [50]. As described in [29], the sink term Q C is formulated as:…”

Section: Sediment-water Boundarymentioning

confidence: 99%

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Understanding the Role of Organic Matter Cycling for the Spatio-Temporal Structure of PCBs in the North Sea

Daewel

Yakushev

Schrum

et al. 2020

Water

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Using the North Sea as a case scenario, a combined three-dimensional hydrodynamic-biogeochemical-pollutant model was applied for simulating the seasonal variability of the distribution of hydrophobic chemical pollutants in a marine water body. The model was designed in a nested framework including a hydrodynamic block (Hamburg Shelf Ocean Model (HAMSOM)), a biogeochemical block (Oxygen Depletion Model (OxyDep)), and a pollutant-partitioning block (PolPar). Pollutants can be (1) transported via advection and turbulent diffusion, (2) get absorbed and released by a dynamic pool of particulate and dissolved organic matter, and (3) get degraded. Our model results indicate that the seasonality of biogeochemical processes, including production, sinking, and decay, favors the development of hot spots with particular high pollutant concentrations in intermediate waters of biologically highly active regions and seasons, and it potentially increases the exposure of feeding fish to these pollutants. In winter, however, thermal convection homogenizes the water column and destroys the vertical stratification of the pollutant. A significant fraction of the previously exported pollutants is then returned to the water surface and becomes available for exchange with the atmosphere, potentially turning the ocean into a secondary source for pollutants. Moreover, we could show that desorption from aging organic material in the upper aphotic zone is expected to retard pollutants transfer and burial into sediments; thus, it is considerably limiting the effectiveness of the biological pump for pollutant exports.

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Section: Methods-model Descriptionmentioning

confidence: 99%

Section: Modeling Biogeochemistry With Oxydepmentioning

confidence: 99%