Changes in trace metal sedimentation during freshening of a coastal basin

Ingri, Johan; Widerlund, Anders; Suteerasak, Thongchai; Bauer, Susanne E.; Elming, Sten-åke

doi:10.1016/j.marchem.2014.06.010

Cited by 24 publications

(10 citation statements)

References 66 publications

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“…At Gåsfjärden, a Swedish coastal site located on the western shores of the Baltic Proper, bottom water hypoxia also occurred during the HTM whereas the area remained oxygenated during the MCA (Ning et al 2016). The central Bothnian Bay was also likely more saline and productive in the early Holocene than today (Ingri et al 2014). Other brackish basins have also been subject to Holocene isostatic uplift, such as the Lower St. Lawrence Estuary and Norwegian Fjords (Skei 1988;Duchesne et al 2010).…”

Section: Coupled Changes In Salinity and Redox Conditions In The Pastmentioning

confidence: 99%

Holocene Refreshening and Reoxygenation of a Bothnian Sea Estuary Led to Enhanced Phosphorus Burial

Dijkstra

Krupinski

Yamane

et al. 2017

Estuaries and Coasts

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Salinity variations in restricted basins like the Baltic Sea can alter their vulnerability to hypoxia (i.e., bottom water oxygen concentrations <2 mg/l) and can affect the burial of phosphorus (P), a key nutrient for marine organisms. We combine porewater and solid-phase geochemistry, microanalysis of sieved sediments (including XRD and synchrotron-based XAS), and foraminiferal δ 18 O and δ 13 C analyses to reconstruct the bottom water salinity, redox conditions, and P burial in the Ångermanälven estuary, Bothnian Sea. Our sediment records were retrieved during the Integrated Ocean Drilling Program (IODP) Baltic Sea Paleoenvironment Expedition 347 in 2013. We demonstrate that bottom waters in the Ångermanälven estuary became anoxic upon the intrusion of seawater in the early Holocene, like in the central Bothnian Sea. The subsequent refreshening and reoxygenation, which was caused by gradual isostatic uplift, promoted P burial in the sediment in the form of Mn-rich vivianite. Vivianite authigenesis in the surface sediments of the more isolated part of the estuary ultimately ceased, likely due to continued refreshening and an associated decline in productivity and P supply to the sediment. The observed shifts in environmental conditions also created conditions for postdepositional formation of authigenic vivianite, and possibly apatite formation, at ∼8 m composite depth. These salinityrelated changes in redox conditions and P burial are highly relevant in light of current climate change. The results specifically highlight that increased freshwater input linked to global warming may enhance coastal P retention, thereby contributing to oligotrophication in both coastal and adjacent open waters.

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Section: Coupled Changes In Salinity and Redox Conditions In The Pastmentioning

confidence: 99%

Holocene Refreshening and Reoxygenation of a Bothnian Sea Estuary Led to Enhanced Phosphorus Burial

Dijkstra

Krupinski

Yamane

et al. 2017

Estuaries and Coasts

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“…McManus et al, 1998;Henkel et al, 2012). Despite these complications Ingri et al (2014) showed that sedimentary Ba may represent primary productivity in the Bothnian Bay during the last 5.5 kyr.…”

Section: Introductionmentioning

confidence: 99%

Hypoxia in the Holocene Baltic Sea: Comparing modern versus past intervals using sedimentary trace metals

2018

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“…Image is developed in Affinity Designer Software version 1.7.3.481. References (Öztürk 1995 ; Borg and Jonsson 1996 ; Pohl and Hennings 1999 ; Neff 2002a ; b ; c ; Ingri et al 2014 ; Rogan Šmuc et al 2018 ; Beldowski et al 2010 ). …”

Section: Discussionmentioning

confidence: 99%

Baltic Sea sediments record anthropogenic loads of Cd, Pb, and Zn

Shahabi-Ghahfarokhi

Josefsson

Apler

et al. 2020

Environ Sci Pollut Res

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The unsustainable settlement and high industrialization around the catchment of the Baltic Sea has left records of anthropogenic heavy metal contamination in Baltic Sea sediments. Here, we show that sediments record post-industrial and anthropogenic loads of Cd, Zn, and Pb over a large spatial scale in the Baltic Sea. We also demonstrate that there is a control on the accumulation of these metals in relation to oxic/anoxic conditions of bottom waters. The total concentrations of Cd, Zn, and Pb were obtained with the near-total digestion method in thirteen cores collected from the Bothnian Bay, the Bothnian Sea, and the west and central Baltic Proper. The lowest average concentrations of Cd, Zn, and Pb were observed in Bothnian Bay (0.4, 125, 40.2 mg kg−1 DW, respectively). In contrast, the highest concentrations were observed in the west Baltic Proper (5.5, 435, and 56.6 mg kg−1 DW, respectively). The results indicate an increasing trend for Cd, Zn, and Pb from the early nineteenth century until the 1970s, followed by a decrease until 2000–2008. However, surface sediments still have concentrations above the pre-industrial values suggested by the Swedish EPA (Cd is 0.2, Zn is 85, and Pb is 31 mg kg−1 DW). The results also show that the pre-industrial Cd, Zn, and Pb concentrations obtained from 3 cores with ages < 1500 B.C. were 1.8, 1.7, and 1.2 times higher, respectively, than the pre-industrial values suggested by the Swedish EPA. To conclude, accumulations of metals in the Baltic Sea are governed by anthropogenic load and the redox conditions of the environment. The significance of correct environmental governance (measures) can be illustrated with the reduction in the pollution of Pb, Zn, and Cd within the Baltic Sea since the 1980s.

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Changes in trace metal sedimentation during freshening of a coastal basin

Cited by 24 publications

References 66 publications

Holocene Refreshening and Reoxygenation of a Bothnian Sea Estuary Led to Enhanced Phosphorus Burial

Holocene Refreshening and Reoxygenation of a Bothnian Sea Estuary Led to Enhanced Phosphorus Burial

Hypoxia in the Holocene Baltic Sea: Comparing modern versus past intervals using sedimentary trace metals

Baltic Sea sediments record anthropogenic loads of Cd, Pb, and Zn

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