Factors controlling migration and concentration of natural and technogenic radionuclides in bottom sediments of the Eastern Gulf of Finland, Baltic Sea

2002 ◽  
pp. 327-332
Author(s):  
Andre Grigoriev ◽  
Alexei Marchenko
Keyword(s):  
Baltic Sea ◽  
Bottom Sediments ◽  
Gulf Of Finland

scholarly journals Pollution history of Neva Bay bottom sediments (eastern Gulf of Finland, Baltic Sea)

Baltica ◽  
2017 ◽  
Vol 30 (1) ◽  
pp. 31-46 ◽  
Author(s):  
Daria Ryabchuk ◽  
Henry Vallius ◽  
Vladimir Zhamoida ◽  
Aarno T. Kotilainen ◽  
Alexander Rybalko ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Baltic Sea ◽  
20Th Century ◽  
Bottom Sediments ◽  
Sediment Cores ◽  
Gulf Of Finland ◽  
Pollution History ◽  
Heavy Metal Concentrations ◽  
History Of ◽  
Neva Bay

Neva Bay is the shallowest and easternmost part of the Gulf of Finland (Baltic Sea). St. Petersburg, Russia’s second largest city, occupies the coastal area where the Neva River debouches into Neva Bay. St. Petersburg has a protracted history of industrial, transportation and urban related activity that have affected Neva Bay. By the sealing off the bay from the eastern Gulf of Finland, the St. Petersburg Flood Protective Facility, which was constructed from the 1970‘s to 2011, transformed Neva Bay into a “technogenic” lagoon. Neva Bay sediments record a unique history of pollution near the metropolis. Heavy metal concentrations of most elements studied varied consistently throughout sediment cores. Temporal trends indicate that metals started to accumulate abruptly in the first half of the 20th century. Zinc, lead and copper were the first metals to reach contaminant thresholds implicating the regional base metal industry as a source. Significant increase in cadmium levels a decade or two later suggests pollution from the regional chemical industry. Comparison of geochemical data collected from sediment cores and recent annual sediment surveys highlighted the temporal history and potential sources of pollution in Neva Bay. Intensive dredging in 2007–2008 resuspended and redistributed contaminated sediment around Neva Bay causing a dramatic increase in benthic sediment heavy metal concentrations. Concentrations of all measured metals subsequently declined from 2009–2014 relative to the elevated values observed for 2007–2008. Pollution history of Neva Bay bottom sediments is closely linked with changing of sedimentation conditions. Analyses of sedimentological data collected by 20th and 21st century scientific surveys reveal dramatic shifts in Neva Bay sedimentation processes over the last three centuries. The western part of Neva Bay has transitioned from a sanddominated system to one of mud accumulation with the aerial extent of mud deposition expanding significantly during the 20th century. This inventory coupled with an understanding of primary natural and anthropogenic processes can help inform decision makers to support the overall ecological health of the bay.

scholarly journals Geoecological conditions in the Baltic sea in 2017

2019 ◽  
Vol 59 (1) ◽  
pp. 184-186 ◽  
Author(s):  
A. V. Krek ◽  
M. O. Ulyanova ◽  
E. S. Bubnova ◽  
V. A. Krechik ◽  
D. V. Ryabchuk ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Bottom Sediments ◽  
Gulf Of Finland ◽  
The South ◽  
Coverage Area ◽  
South Eastern ◽  
Geological Surveys ◽  
The Baltic ◽  
The Gulf Of Finland ◽  
Eastern Baltic

In 2017, comprehensive geological, geophysical, hydrological and hydrochemical researches were conducted in the South-Eastern Baltic Sea and the Gulf of Finland. 1775 nautical miles of surveys were conducted using multibeam echosounder and profiler. Surface bottom sediments (156 samples), the upper undisturbed layer of pelitic sediments and bottom water (15 samples), 2 cores were taken. Laboratory analyzes were performed on pH (189), concentration of oxygen (246), suspended matter (286) and oil products (110). Microplastic was also collected in the water (118) and bottom sediments (45). Conducting comprehensive research in the South-Eastern Baltic Sea allowed us to record the weakening of the Major Baltic Inflow effects, followed by changes in the environmental conditions of the region. Geological surveys in the Gulf of Finland expanded the coverage area of the bottom of multibeam surveys and contributed to the refinement of the formation processes of linear and circular transgressions at the bottom.

Paleoecological study of bottom sediments of the lake Goluboye (Karelian Isthmus) according to the results of diatom analysis

2019 ◽  
pp. 265-269
Author(s):  
Angelina E. Shatalova ◽  
Uriy A. Kublitsky ◽  
Dmitry A. Subetto ◽  
Anna V. Ludikova ◽  
Alar Rosentau ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Bottom Sediments ◽  
Modern Science ◽  
Karelian Isthmus ◽  
The Baltic Sea ◽  
Diatom Analysis ◽  
North West ◽  
The North ◽  
Important Direction ◽  
The Baltic

The study of paleogeography of lakes is an actual and important direction in modern science. As part of the study of lakes in the North-West of the Karelian Isthmus, this analysis will establish the dynamics of salinity of objects, which will allow to reconstruct changes in the level of the Baltic Sea in the Holocene.

PROBLEM OF HEAVY METAL SURFACE SEDIMENT CONTAMINATION IN THE EASTERN GULF OF FINLAND

2017 ◽  
Author(s):  
N Derugina ◽  
N Derugina ◽  
А Grigoriev ◽  
A Grigoriev ◽  
Дарья Рябчук ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Bottom Sediments ◽  
Late Holocene ◽  
Sediment Contamination ◽  
Gulf Of Finland ◽  
Slow Decline ◽  
Contamination Levels ◽  
The Gulf Of Finland ◽  
Neva Bay

This project defines the pre-industrial quantities of heavy metals in sediment sequences of the Late Holocene from the Eastern Gulf of Finland. A comparative analysis reveals differences and similarities in the current concentrations of heavy metals in bottom sediments and pre-industrial levels. It is found that the maximum concentrations of heavy metals in the bottom sediments of the Gulf of Finland and Neva Bay occurred in the period of 1950-1990. Since the 1990s, the trend has been a slow decline in the contamination levels; however, the concentrations of some heavy metals in bottom sediments remain high.

Sediment accumulation of nutrients (N, P) in the eastern Gulf of Finland (Baltic Sea)

1997 ◽  
Vol 99 (1-4) ◽  
pp. 477-486 ◽  
Author(s):  
J. Lehtoranta ◽  
H. Pitkänen ◽  
O. Sandman
Keyword(s):  
Baltic Sea ◽  
Sediment Accumulation ◽  
Gulf Of Finland

The mussel caging approach in assessing biological effects of wastewater treatment plant discharges in the Gulf of Finland (Baltic Sea)

2015 ◽  
Vol 97 (1-2) ◽  
pp. 135-149 ◽  
Author(s):  
Raisa Turja ◽  
Kari K. Lehtonen ◽  
Axel Meierjohann ◽  
Jenny-Maria Brozinski ◽  
Emil Vahtera ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Baltic Sea ◽  
Wastewater Treatment Plant ◽  
Biological Effects ◽  
Treatment Plant ◽  
Gulf Of Finland ◽  
The Gulf Of Finland

scholarly journals An integrated simulation model to evaluate national measures for the abatement of agricultural nutrients in the Baltic Sea

2009 ◽  
Vol 18 (3-4) ◽  
pp. 440-459 ◽  
Author(s):  
K. HYYTIÄINEN ◽  
H. AHTIAINEN ◽  
J. HEIKKILÄ
Keyword(s):  
Water Quality ◽  
Simulation Model ◽  
Baltic Sea ◽  
Arable Land ◽  
Gulf Of Finland ◽  
Nutrient Loads ◽  
The Baltic Sea ◽  
The Baltic ◽  
Bothnian Bay ◽  
The Gulf Of Finland

This study introduces a prototype model for evaluating measures to abate agricultural nutrients in the Baltic Sea from a Finnish national perspective. The stochastic simulation model integrates nutrient dynamics of nitrogen and phosphorus in the sea basins adjoining the Finnish coast, nutrient loads from land and other sources, benefits from nutrient abatement (in the form of recreation and other ecosystem services) and the costs of agricultural abatement activities. The aim of the study is to present the overall structure of the model and to demonstrate its potential using preliminary parameters. The model is made flexible for further improvements in all of its ecological and economic components. The results of a sensitivity analysis suggest that investments in reducing the nutrient load from arable land in Finland would become profitable only if the neighboring countries in the northern Baltic committed themselves to similar reductions. Environmental investments for improving water quality yield the highest returns for the Bothnian Bay and the Gulf of Finland, with smaller returns for the Bothnian Sea. Somewhat surprisingly, in the Bothnian Bay the abatement activities become profitable from the national viewpoint, because the riverine loads from Finland represent a high proportion of the total nutrient loads. In the Gulf of Finland, this proportion is low, but the size of the coastal population benefiting from improved water quality is high.;

Three new chrysophycean stomatocysts with long spines from the Gulf of Finland, Baltic Sea

Phytotaxa ◽  
2021 ◽  
Vol 528 (4) ◽  
pp. 255-260
Author(s):  
SVETLANA N. SHADRINA
Keyword(s):  
Baltic Sea ◽  
Working Group ◽  
Gulf Of Finland ◽  
Sem Micrographs ◽  
Biological Affinity ◽  
The Gulf Of Finland

Three new morphotypes of chrysophycean stomatocysts with long spines are described following International Statospore Working Group (ISWG) guidelines and illustrated by SEM micrographs. Differences of our new morphotypes from known stomatocysts are discussed. Their biological affinity is currently unknown.

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