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Deoxygenation of the Baltic Sea during the last millennium

Abstract.

"Over the last 1,000 years, changing climate strongly influenced the ecosystem of coastal oceans such as the Baltic Sea. Sedimentary records revealed that changing temperatures could be linked to changing oxygen levels, spreading anoxic, oxygen-free areas in the Baltic Sea. However, the attribution of changing oxygen levels remains to be challenging. This work simulates a preindustrial period of 850 years, covering the Medieval Climate Anomaly (MCA) and the Little Ice Age using a coupled physical-biogeochemical model. [...]".

 

Source: Frontiers in Marine Science
Authors: Florian Börgel et al.
DOI: https://doi.org/10.3389/fmars.2023.1174039

Read the full article here.


Deoxygenation impacts on Baltic Sea cod: Dramatic declines in ecosystem services of an iconic keystone predator

Abstract.

"The intensified expansion of the Baltic Sea’s hypoxic zone has been proposed as one reason for the current poor status of cod (Gadus morhua) in the Baltic Sea, with repercussions throughout the food web and on ecosystem services. We examined the links between increased hypoxic areas and the decline in maximum length of Baltic cod, a demographic proxy for services[...]"

 

Source: Ambio
Authors: Alessandro Orio et al.
DOI: https://doi.org/10.1007/s13280-021-01572-4

Read the full article here.


Reconstructing N2-fixing cyanobacterial blooms in the Baltic Sea

beyond observations using 6- and 7-methylheptadecane in sediments as specific biomarkers

Abstract.

"Summer cyanobacterial blooms represent a threat to the Baltic Sea ecosystem, causing deoxygenation of the bottom water and the spread of the so-called dead zones. The history of the Baltic Sea cyanobacterial blooms is known from in situ and satellite observations since the early 1980s but is still not well understood. [...]"

Source: Biogeosciences
Authors: Jérôme Kaiser et al.
DOI: 10.5194/bg-17-2579-2020

Read the full article here.


Ventilation of the Northern Baltic Sea (Preprint)

Abstract.

"The Baltic Sea is a semi-enclosed, brackish water sea in northern Europe. The deep basins of the central Baltic Sea regularly show hypoxic conditions. In contrast, the northern parts of the Baltic Sea, the Bothnian Sea and Bay, are well oxygenated. Lateral inflows or a ventilation due to convection are possible mechanisms for high oxygen concentrations in the deep water of the northern Baltic Sea. [...]"

Source: Ocean Science
Authors: Thomas Neumann et al.
DOI: 10.5194/os-2019-48

Read the full article here.


Organic carbon recycling in Baltic Sea sediments – An integrated estimate on the system scale based on in situ measurements

Abstract.

"In situ measured benthic fluxes of dissolved inorganic carbon (DIC), a proxy for organic carbon (OC) oxidation or recycling rates, are used together with burial rates based on measured sediment accumulation rates (SAR) and vertical distribution of OC in the sediment solid phase to construct a benthic OC budget for the Baltic Sea system. [...]"

Source: Marine Chemistry
Authors: Madeleine M. Nilsson et al.
DOI: 10.1016/j.marchem.2018.11.004

Read the full article here.


The Baltic Sea as a time machine for the future coastal ocean

Abstract.

"Coastal global oceans are expected to undergo drastic changes driven by climate change and increasing anthropogenic pressures in coming decades. Predicting specific future conditions and assessing the best management strategies to maintain ecosystem integrity and sustainable resource use are difficult, because of multiple interacting pressures, uncertain projections, and a lack of test cases for management. [...]"

Source: Science Advances
Authors: Thorsten B. H. Reusch et al.
DOI: 10.1126/sciadv.aar8195

Read the full article here.


Deoxygenation of the Baltic Sea during the last century

Abstract.

"Deoxygenation is a global problem in coastal and open regions of the ocean, and has led to expanding areas of oxygen minimum zones and coastal hypoxia. The recent expansion of hypoxia in coastal ecosystems has been primarily attributed to global warming and enhanced nutrient input from land and atmosphere. The largest anthropogenically induced hypoxic area in the world is the Baltic Sea, where the relative importance of physical forcing versus eutrophication is still debated. We have analyzed water column oxygen and salinity profiles to reconstruct oxygen and stratification conditions over the last 115 y and compare the influence of both climate and anthropogenic forcing on hypoxia. [...]"

Source: Procedings of the National Academy of Sciences of the United States of America (PNAS)
Authors: Jacob Carstensen et al.
DOI: 10.1073/pnas.1323156111

Full article


Aerobic and anaerobic ammonium oxidizers in the Cariaco Basin: distributions of major taxa and nitrogen species across the redoxcline

Abstract.

"Depth distributions of cells and functional gene copies from anaerobic ammonium-oxidizing (anammox) bacteria, aerobic ammonium-oxidizing bacteria (AOB) and archaea (AOA) in the Cariaco Basin, Venezuela were obtained using FISH and q-PCR assays. These distributions were compared to concentrations of dissolved ammonium (NH4+), nitrite (NO2-), nitrate (NO3-), hydrogen sulfide (H2S) and oxygen (O2) along the redoxcline during 3 cruises. Cell counts of anammox bacteria and copies of their nitrite reductase gene (Scalindua-nirS) were consistently observed in 2 distinct layers: the suboxic zone (≤1.1 × 106 cells l-1) and the upper euxinic zone (≤4.7 × 106 cells l-1). [...]"

Source: Aquatic Microbial Ecology 79
Authors: Sara Cernadas-Martín et al.
DOI: 10.3354/ame01817

Full article


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