New insights into the formation and burial of Fe/Mn accumulations in Lake Baikal sediments

Och, Lawrence M.; Müller, Beat; Voegelin, Andreas; Ulrich, Andrea; Göttlicher, Jörg; Steiniger, Ralph; Mangold, Stefan; Вологина, Е. Г.; Sturm, Michael

doi:10.1016/j.chemgeo.2012.09.011

Cited by 67 publications

(109 citation statements)

References 73 publications

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“…The variations of F red in Lake Geneva show only the variations due to sampling depths as all cores were collected in summer. Red marks were calculated from single-core literature data (Lake Baikal (LB): Och et al, 2012; Lake Sempach (SE): Müller et al, 2012b; Rotsee (RO): Naeher et al, 2012;Pfäffikersee (PF, unpublished); and Türlersee (TU, unpublished)). TOC-MAR values from Lake Geneva (LG) are based on sedimentation rate estimates from the literature (Vernet et al, 1983;Loizeau et al, 2012;Span et al, 1990).…”

Section: F Red Controlled By Sediment Toc Mass Accumulation Ratementioning

confidence: 99%

“…Additional sediment cores were extruded and sampled in 0.5 to 1 cm sections. Water content was calculated from the weight difference before and after freeze drying, and the porosity was estimated from the density and the respective TOC content (Och et al, 2012). Freeze-dried sediments were ground in an agate mortar and further analyzed for TOC / TN with a Euro EA 3000 elemental analyzer (Hekatech).…”

Section: Sediment Sampling and Porewater Analysismentioning

confidence: 99%

“…Total organic carbon mass accumulation rate in the lake sediment (TOC-MAR, in gC m −2 yr −1 ) at each coring site was calculated from the sedimentation rate (SR, in cm yr −1 ), porosity (φ), dry density (ρ dry in g cm −3 ), and TOC (mg g −1 ) for each 5 mm interval (Och et al, 2012) (Eq. 4).…”

Section: Estimation Of Total Organic Carbon Mass Accumulation Ratesmentioning

confidence: 99%

“…The dry density is estimated according to the empirical relationship between TOC content (in %) and density of geogenic sediments (Och et al, 2012),…”

Section: Estimation Of Total Organic Carbon Mass Accumulation Ratesmentioning

confidence: 99%

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Organic carbon mass accumulation rate regulates the flux of reduced substances from the sediments of deep lakes

et al. 2017

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Abstract. The flux of reduced substances, such as methane and ammonium, from the sediment to the bottom water (F red ) is one of the major factors contributing to the consumption of oxygen in the hypolimnia of lakes and thus crucial for lake oxygen management. This study presents fluxes based on sediment porewater measurements from different water depths of five deep lakes of differing trophic states. In mesoto eutrophic lakes F red was directly proportional to the total organic carbon mass accumulation rate (TOC-MAR) of the sediments. TOC-MAR and thus F red in eutrophic lakes decreased systematically with increasing mean hypolimnion depth (z H ), suggesting that high oxygen concentrations in the deep waters of lakes were essential for the extent of organic matter mineralization leaving a smaller fraction for anaerobic degradation and thus formation of reduced compounds. Consequently, F red was low in the 310 m deep mesoeutrophic Lake Geneva, with high O 2 concentrations in the hypolimnion. By contrast, seasonal anoxic conditions enhanced F red in the deep basin of oligotrophic Lake Aegeri. As TOC-MAR and z H are based on more readily available data, these relationships allow estimating the areal O 2 consumption rate by reduced compounds from the sediments where no direct flux measurements are available.

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Section: F Red Controlled By Sediment Toc Mass Accumulation Ratementioning

confidence: 99%

Section: Sediment Sampling and Porewater Analysismentioning

confidence: 99%

Section: Estimation Of Total Organic Carbon Mass Accumulation Ratesmentioning

confidence: 99%

“…The dry density is estimated according to the empirical relationship between TOC content (in %) and density of geogenic sediments (Och et al, 2012),…”

Section: Estimation Of Total Organic Carbon Mass Accumulation Ratesmentioning

confidence: 99%

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Organic carbon mass accumulation rate regulates the flux of reduced substances from the sediments of deep lakes

et al. 2017

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“…Oxidized zones and rates of sedimentation are directly linked to quantity and quality of sedimentary organic matter, as low sedimentation rates allow deeper diffusion of oxygen into sediment pore-water, whereas high sedimentation rates prevent deep oxygen penetration (Mizandrontsev, 1982). Measurements of nutrient fluxes across the sediment/water-interface proved these assumptions with a quantitative interface model of nutrient cycling (Müller et al, 2005) and demonstrated that the thickness of the oxidized zone is time-dependent (Och et al, 2012). Thin oxidized zones atop deep-water cores BAIK00-1 and BAIK08-2 (Figs.…”

Section: Mineralsmentioning

confidence: 98%

Holocene and Late Glacial sedimentation near steep slopes in southern Lake Baikal

2015

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Phosphorus recycling in deeply oxygenated sediments in Lake Superior controlled by organic matter mineralization

Zhang

Katsev

2018

Limnology & Oceanography

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Remobilization of phosphorus from aquatic sediments has been extensively investigated in systems prone to anoxia, while studies in well‐oxygenated systems have been rare. The recycling efficiency of P in the offshore sediments in the Great Lakes, in particular, is still poorly known. We investigated phosphorus cycling at 13 locations (26–318 m water depth) in oligotrophic Lake Superior where oxygen penetrates into sediments by 2–12 cm. Vertical distributions of iron and phosphorus were measured in porewater and solid fractions, and transformation rates and vertical fluxes were calculated. Whereas a significant fraction of P is bound to ferric Fe in surface sediments, P effluxes into the water column (2.5–7.0 μmol m−2 d−1) are only weakly affected by iron reduction, because Fe : P ratios in surface sediment are high (∼ 40–80 mol : mol), and P sorption capacity is far from its limit. In contrast to organic rich systems where P effluxes are sensitive to redox conditions, phosphate effluxes in organic‐poor well‐oxygenated Lake Superior are controlled by the rates of organic phosphorus mineralization, similar to marine sediments. The efficiency of P recycling in Lake Superior sediments, however, is substantially lower than in marine sediments due to different P biogeochemistry. Only ∼ 12% of deposited P is returned to the water column. While burial into sediments is the dominant sink for P in the lake, sediments still contribute up to 40% of total water column P inputs. Similar behavior should be expected in other well‐oxygenated freshwater systems, such as other large oligotrophic lakes.

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New insights into the formation and burial of Fe/Mn accumulations in Lake Baikal sediments

Cited by 67 publications

References 73 publications

Organic carbon mass accumulation rate regulates the flux of reduced substances from the sediments of deep lakes

Organic carbon mass accumulation rate regulates the flux of reduced substances from the sediments of deep lakes

Holocene and Late Glacial sedimentation near steep slopes in southern Lake Baikal

Phosphorus recycling in deeply oxygenated sediments in Lake Superior controlled by organic matter mineralization

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