The spreading of eutrophication in the eastern coast of the Gulf of Bothnia, northern Baltic Sea – An analysis in time and space

Lundberg, Cecilia; Jakobsson, Britt-Marie; Bonsdorff, Erik

doi:10.1016/j.ecss.2009.01.005

Cited by 36 publications

(32 citation statements)

References 13 publications

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“…While productivity in the Bothnian Sea is relatively low when compared to other areas of the Baltic Sea [19], changes in water transparency suggest that phytoplankton biomass in the area has increased over the past century, with the changes being caused by eutrophication [39]. As a consequence, the input of locally produced organic matter to the sediments is expected to have increased with time.…”

Section: Discussionmentioning

confidence: 99%

“…While primary production in the system is low compared to the Baltic Proper [19], sediment organic carbon accumulation in the basin is still significant, because of major terrestrial input of organic matter from rivers [20], [21], [22]. Nitrate penetration in the sediment is limited to the upper cms due to active denitrification [20], [23].…”

Section: Introductionmentioning

confidence: 99%

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Coupled Dynamics of Iron and Phosphorus in Sediments of an Oligotrophic Coastal Basin and the Impact of Anaerobic Oxidation of Methane

et al. 2013

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Studies of phosphorus (P) dynamics in surface sediments of lakes and coastal seas typically emphasize the role of coupled iron (Fe), sulfur (S) and P cycling for sediment P burial and release. Here, we show that anaerobic oxidation of methane (AOM) also may impact sediment P cycling in such systems. Using porewater and sediment profiles for sites in an oligotrophic coastal basin (Bothnian Sea), we provide evidence for the formation of Fe-bound P (possibly vivianite; Fe3(PO4)2 .8H2O) below the zone of AOM with sulfate. Here, dissolved Fe2+ released from oxides is no longer scavenged by sulfide and high concentrations of both dissolved Fe2+ (>1 mM) and PO4 in the porewater allow supersaturation with respect to vivianite to be reached. Besides formation of Fe(II)-P, preservation of Fe-oxide bound P likely also contributes to permanent burial of P in Bothnian Sea sediments. Preliminary budget calculations suggest that the burial of Fe-bound P allows these sediments to act as a major sink for P from the adjacent eutrophic Baltic Proper.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled Dynamics of Iron and Phosphorus in Sediments of an Oligotrophic Coastal Basin and the Impact of Anaerobic Oxidation of Methane

et al. 2013

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“…1C). In contrast, the deep waters of the Bothnian Sea are oxic and relatively fresh, because the sills of the Åland Sea are too shallow to allow exchange of deep waters from the Baltic Proper, and because nutrient loading is more moderate in northern regions, leading to lower productivity and oxygen demand (Lundberg et al, 2009).…”

Section: Introductionmentioning

confidence: 97%

Glacio-isostatic control on hypoxia in a high-latitude shelf basin

Jilbert

Conley

Gustafsson

et al. 2015

Geology

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In high-latitude continental shelf environments, late Pleistocene glacial overdeepening and early Holocene eustatic sea-level rise combined to create restricted marine basins with a high vulnerability to oxygen depletion. Here we show that ongoing glacio-isostatic rebound during the Holocene may have played an important role in determining the distribution of past hypoxia in these environments by controlling the physical exchange of water masses and the distribution of large-scale phosphorus (P) sinks. We focus on the Baltic Sea, where sediment records from a large, presently oxic sub-basin show evidence for intense hypoxia and cyanobacteria blooms during the Holocene Thermal Maximum. Using paleobathymetric modeling, we show that this period was characterized by enhanced deep-water exchange, allowing widespread phosphorus regeneration. Intra-basin sills then shoaled over a period of several thousand years, enhancing P burial in one of the sub-basins. Together with climate forcing, this may have caused the termination of hypoxia throughout the Baltic Sea. Similar rearrangements of physical and chemical processes likely occurred in response to glacio-isostatic rebound in other high-latitude shelf basins during the Holocene.

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“…Lundberg et al 2009. Nutrient concentrations can be influenced also by upward mixing from deeper water layers (Vahtera et al 2007;Feistel et al 2008;Reissmann et al 2009).…”

Section: Integrated Assessmentmentioning

confidence: 99%

Getting the measure of eutrophication in the Baltic Sea: towards improved assessment principles and methods

Andersen

Axe²,

Backer

et al. 2010

Biogeochemistry

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The spreading of eutrophication in the eastern coast of the Gulf of Bothnia, northern Baltic Sea – An analysis in time and space

Cited by 36 publications

References 13 publications

Coupled Dynamics of Iron and Phosphorus in Sediments of an Oligotrophic Coastal Basin and the Impact of Anaerobic Oxidation of Methane

Coupled Dynamics of Iron and Phosphorus in Sediments of an Oligotrophic Coastal Basin and the Impact of Anaerobic Oxidation of Methane

Glacio-isostatic control on hypoxia in a high-latitude shelf basin

Getting the measure of eutrophication in the Baltic Sea: towards improved assessment principles and methods

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