Modeling the influence of oxygenated inflows on the biogeochemical structure of the Gotland Sea, central Baltic Sea: Changes in the distribution of manganese

Yakushev, E. V.; Kuznetsov, Ivan; Подымов, О. И.; Burchard, Hans; Neumann, Thomas; Pollehne, Falk

doi:10.1016/j.cageo.2011.01.001

Cited by 14 publications

(14 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Carstensen et al, 2014), with the general flow of water in the deep basins going from the Gotland to the Fårö and the Landsort Deep (Holtermann et al, 2012). For example, the bottom water in the Gotland Deep was free of hydrogen sulfide for 4 months following the inflow of 1993-1994 (Neretin et al, 2003;Yakushev et al, 2011) whereas the Landsort Deep was less affected because the bottom water at the time already contained oxygen (Fig. 7).…”

Section: Sediment Mn Cycling In the Baltic Seamentioning

confidence: 99%

“…7). Using biogeochemical modelling of a typical inflow in the Gotland Deep area, Yakushev et al (2011) showed that dissolved Mn in the water column was oxidized to Mn oxides and settled to the bottom over a time period of months. Dissolved Mn appeared in the water column again upon the return of bottom water anoxia and steady-state conditions in the water column were established in the model after ca.…”

Section: Sediment Mn Cycling In the Baltic Seamentioning

confidence: 99%

See 1 more Smart Citation

Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?

Lenz¹,

Jilbert²,

Conley³

et al. 2014

Preprint

View full text Add to dashboard Cite

Abstract. Expanding hypoxia in the Baltic Sea over the past century has led to anoxic and sulfidic (euxinic) deep basins that are only periodically ventilated by inflows of oxygenated waters from the North Sea. In this study, we investigate the consequences of the expanding hypoxia for manganese (Mn) burial in the Baltic Sea using a combination of pore water and sediment analyses of well-dated sediment cores from 8 locations. Diffusive fluxes of dissolved Mn from sediments to overlying waters at oxic and hypoxic sites are in line with an active release of Mn from these areas. However, this flux of Mn is only small when compared to the large pool of Mn already present in the hypoxic and anoxic water column. Our results highlight two modes of Mn carbonate formation in sediments of the deep basins. In the Gotland Deep area, Mn carbonates likely form from Mn oxides that are precipitated from the water column directly following North Sea inflows. In the Landsort Deep, in contrast, Mn carbonate and Mn sulfide layers form independent of inflow events, with pore water Mn produced in deeper layers of the sediment acting as a key Mn source. While formation of Mn enrichments in the Landsort Deep continues to the present, this does not hold for the Gotland Deep area. Here, increased euxinia, as evident from measured bottom water sulfide concentrations and elevated sediment molybdenum (Mo), goes hand in hand with a decline in sediment Mn and recent inflows of oxygenated water (since ca. 1995) are no longer consistently recorded as Mn carbonate layers. We postulate that the reduction of Mn oxides by hydrogen sulfide following inflows has become so rapid that Mn2+ is released to the water column before Mn carbonates can form. Our results have important implications for the use of Mn carbonate enrichments as a redox proxy in marine systems.

show abstract

Section: Sediment Mn Cycling In the Baltic Seamentioning

confidence: 99%

Section: Sediment Mn Cycling In the Baltic Seamentioning

confidence: 99%

Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?

Lenz¹,

Jilbert²,

Conley³

et al. 2014

Preprint

View full text Add to dashboard Cite

show abstract

“…The increase in sedimentation velocity is justified by the greater amount of fecal particles and aggregated material in dead organic matter. Both velocities are well within the range of other work, such as Yakushev et al (2011) and Savchuk and Wulff (2009), and have been set to optimize model performance.…”

Section: Methodsmentioning

confidence: 91%

“…The approach is however too simplistic, and rigid, for forecasts, or functional studies of the biogeochemical system. We therefore adopt the same type of parameterization as Yakushev et al (2011) and others, and calculate the mineralization rate from a fixed rate constant, the transient concentration of organic matter, and temperature dependence (Eq. 12).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Modeling the dissolved CO₂ system in the redox environment of the Baltic Sea

Edman

Omstedt

2012

Limnology & Oceanography

View full text Add to dashboard Cite

Generation and depletion of total alkalinity (A T ) were added to a Baltic Sea numerical model. The vertical distribution of generation and depletion of total alkalinity were described and attributed to different processes in the Eastern Gotland basin at the Gotland deep station (BY15) during the 1995-2004 period. At this site, the mean annual generation (28.2 mmol kg 21 yr 21 ) and depletion (225.8 mmol kg 21 yr 21 ) were almost balanced, though the transient rates were much faster (+125/2340 mmol kg 21 yr 21 ). The mean volume-integrated A T content increased up to 50 mmol kg 21 when generation and depletion were added to the model. The A T changes were coupled to oxidation-reduction (redox) reactions and the model budget indicates that internal generation and depletions is as important as lateral transports, including riverine input, at this site. Model predictive capability in marine environments with strong biogeochemical gradients was improved by coupling within the dissolved CO 2 , and the biogeochemical, systems. This enables evaluation of eutrophication, acidification, and climate change simultaneously, and is important specifically in regions with permanent or periodic anoxia.

show abstract

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

Yakushev

Debol’skaya

Kuznetsov

et al. 2011

The Handbook of Environmental Chemistry

View full text Add to dashboard Cite

Modeling the influence of oxygenated inflows on the biogeochemical structure of the Gotland Sea, central Baltic Sea: Changes in the distribution of manganese

Cited by 14 publications

References 13 publications

Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?

Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?

Modeling the dissolved CO₂ system in the redox environment of the Baltic Sea

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

Contact Info

Product

Resources

About

Modeling the influence of oxygenated inflows on the biogeochemical structure of the Gotland Sea, central Baltic Sea: Changes in the distribution of manganese

Cited by 14 publications

References 13 publications

Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?

Are recent changes in sediment manganese sequestration in the euxinic basins of the Baltic Sea linked to the expansion of hypoxia?

Modeling the dissolved CO2 system in the redox environment of the Baltic Sea

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

Contact Info

Product

Resources

About

Modeling the dissolved CO₂ system in the redox environment of the Baltic Sea