The chemical character and burial of phosphorus in shallow coastal sediments in the northeastern Baltic Sea

Lukkari, Kaarina; Leivuori, Mirja; Vallius, Henry; Kotilainen, Aarno

doi:10.1007/s10533-009-9315-y

Cited by 44 publications

(38 citation statements)

References 75 publications

(112 reference statements)

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“…This implies that the ability of sediment to retain P was low, and mineralization-derived P was released. Incubation-derived PO 4 -P flux at the easternmost site (7) was higher than determined earlier in the GoF by Conley et al (1997) and Lukkari et al (2009). However, e.g., Val Klump and Martens (1981) reported even higher PO 4 -P flux in OM-rich, anoxic Cape Lookout Bight (USA) than in the poorly oxygenated sediments in the open GoF.…”

Section: Dissolved Species At the Sediment-water Interfacementioning

confidence: 49%

“…At this site, the sediment surface was high in TC sed and OP, and part of PO 4 -P probably originated in the mineralized OP pool. The fairly high NH 4 -N, evidently, released from OM to the near-bottom water, supported this conclusion (Martens and Goldhaber 1978;Kamp-Nielsen 1992;Lukkari et al 2009). Both O 2 and NO 3 -N were present, and ferric (Fe 3? )…”

Section: Dissolved Species At the Sediment-water Interfacementioning

confidence: 74%

“…The low ratio at the neighboring site 5 (1.0), on the other hand, suggests that the sorption sites of the Fe oxides were more occupied with P than at the other sites. Earlier studies in the Baltic have reported the reduction induced decrease in Fe-P with sediment depth (Jensen and Thamdrup 1993;Carman 1998;Aigars 2001;Łukawska-Matuszewska and Bolałek 2008;Lukkari et al , 2009). Nevertheless, the reductant also dissolves Fe not active in P binding (Mehra and Jackson 1960;Jensen and Thamdrup 1993).…”

Section: Reactive Pmentioning

confidence: 90%

“…However, he did not separate redox-sensitive P. Recently, we explored the chemical character of P in shallow coastal sediments overlain by oxic nearbottom water in the northern GoF and Archipelago Sea and found that the area affected by sediment transportation was dominated by apatite-P. In contrast, OP forms dominated in the eastern coast, where the OM-rich sediments are vulnerable for temporal hypoxia (Lukkari et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…The abundance of OP as well as its role in release of P from coastal sediments (Lukkari et al 2009) suggests that OP may also have significant role in P release from the hypoxic area in the open GoF. Release of sediment P under O 2 depletion is usually explained by dissolution of ferric-iron compounds (Einsele 1936(Einsele , 1938Mortimer 1941Mortimer , 1942, although O 2 depletion can also enhance release of OP Ingall and Jahnke 1994;Ingall and Clark 1998;Suzumura and Kamatani 1995).…”

Section: Introductionmentioning

confidence: 99%

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The chemical character and behaviour of phosphorus in poorly oxygenated sediments from open sea to organic-rich inner bay in the Baltic Sea

Lukkari¹,

Leivuori²,

Kotilainen

2009

Biogeochemistry

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The chemical composition and vertical distribution of phosphorus (P) in poorly oxygenated sediments in a continuum extending from the open Baltic Sea towards an organic-rich inner bay were characterized by sequential extraction to examine the potential for release of sediment P. The chemical composition of P was related to chemical and physical characteristics of the sediments and the chemistry of pore water and near-bottom water to better understand the behaviour of P. Sediment P increased towards the inner bay, and the concentration of organic matter appeared to dictate its composition: the dominance of apatite-P turned to dominance of organic P (OP). Sediment P burial and, thus, release from sediment P reserves varied depending on the chemical composition of P. Dissolved species at the sediment-water interface suggested fluctuating redox conditions that affect P binding at short time scale. Redox-sensitive, iron (Fe)-bound P was usually relatively low because of poor oxygen (O 2 ) conditions, which emphasized the role of OP in P release. The results indicate that, over the long term, the abundant organic P reserve may support a significant continuing P release from hypoxic sediments in the severely eutrophied Gulf of Finland (GoF) because capture of P into Fe oxyhydroxides at the sediment surface is restricted. The average long-term minimum annual rate of P release from poorly oxygenated sediments below about 60 m depth in the GoF was approximated on the basis of the vertical distribution of sedimentary P forms and estimates of sedimentation rate.

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Section: Dissolved Species At the Sediment-water Interfacementioning

confidence: 49%

Section: Dissolved Species At the Sediment-water Interfacementioning

confidence: 74%

Section: Reactive Pmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The chemical character and behaviour of phosphorus in poorly oxygenated sediments from open sea to organic-rich inner bay in the Baltic Sea

Lukkari¹,

Leivuori²,

Kotilainen

2009

Biogeochemistry

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Efficiency of the coastal filter: Nitrogen and phosphorus removal in the Baltic Sea

Asmala

Carstensen

Conley

et al. 2017

Limnology & Oceanography

114

127

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An important function of coastal ecosystems is the reduction of the nutrient flux from land to the open sea, the coastal filter. In this study, we focused on the two most important coastal biogeochemical processes that remove nitrogen and phosphorus permanently: denitrification and phosphorus burial. We compiled removal rates from coastal systems around the Baltic Sea and analyzed their spatial variation and regulating environmental factors. These analyses were used to scale up denitrification and phosphorus burial rates for the entire Baltic Sea coastal zone. Denitrification rates ranged from non‐detectable to 12 mmol N m−2 d−1, and correlated positively with both bottom water nitrate concentration and sediment organic carbon content. The rates exhibited a strong decreasing gradient from land to the open coast, which was likely driven by the availability of nitrate and labile organic carbon, but a high proportion of non‐cohesive sediments in the coastal zone decreased the denitrification efficiency relative to the open sea. Phosphorus burial rates varied from 0.21 g P m−2 yr−1 in open coastal systems to 2.28 g P m−2 yr−1 in estuaries. Our analysis suggests that archipelagos are important phosphorus traps and account for 45% of the coastal P removal, while covering only 17% of the coastal areas. High burial rates could partly be sustained by phosphorus import from the open Baltic Sea. We estimate that the coastal filter in the Baltic Sea removes 16% of nitrogen and 53% of phosphorus inputs from land.

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Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria

Hermans

Pascual

Behrends

et al. 2021

Limnology & Oceanography

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Coastal waters worldwide suffer from increased eutrophication and seasonal bottom water hypoxia. Here, we assess the dynamics of iron (Fe), manganese (Mn), and phosphorus (P) in sediments of the eutrophic, brackish Gulf of Finland populated by cable bacteria. At sites where bottom waters are oxic in spring, surface enrichments of Fe and Mn oxides and high abundances of cable bacteria were observed in sediments upon sampling in early summer. At one site, Fe and P were enriched in a thin layer (~3 mm) just below the sediment-water interface. X-ray absorption near edge structure and micro X-ray fluorescence analyses indicate that two-thirds of the P in this layer was associated with poorly crystalline Fe oxides, with an additional contribution of Mn(II) phosphates. The Fe enriched layer was directly overlain by a Mn oxide-rich surface layer (~2 mm). The Fe oxide layer was likely of diagenetic origin, formed through dissolution of Fe monosulfides and carbonates, potentially induced by cable bacteria in the preceding months when bottom waters were oxic. Most of the Mn oxides were likely deposited from the water column as part of a cycle of repeated deposition and remobilization. Further research is required to confirm whether cable bacteria activity in spring indeed promotes the formation of distinct layers enriched in Fe, Mn, and P minerals in Gulf of Finland sediments. The temporal variations in biogeochemical cycling in this seasonally hypoxic coastal system, potentially controlled by cable bacteria activity, have little impact on permanent sedimentary Fe, Mn, and P burial.

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The chemical character and burial of phosphorus in shallow coastal sediments in the northeastern Baltic Sea

Cited by 44 publications

References 75 publications

The chemical character and behaviour of phosphorus in poorly oxygenated sediments from open sea to organic-rich inner bay in the Baltic Sea

The chemical character and behaviour of phosphorus in poorly oxygenated sediments from open sea to organic-rich inner bay in the Baltic Sea

Efficiency of the coastal filter: Nitrogen and phosphorus removal in the Baltic Sea

Coupled dynamics of iron, manganese, and phosphorus in brackish coastal sediments populated by cable bacteria

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