scholarly journals Sedimentation rates (data on 210pb and 137cs radionuclides) in different facial-genetic types of the Kara sea bottom sediments

2019 ◽  
Vol 64 (11) ◽  
pp. 1158-1174
Author(s):  
V. Yu. Rusakov ◽  
A. P. Borisov ◽  
G. Yu. Solovieva
Keyword(s):  
Bottom Sediments ◽  
Sedimentation Rate ◽  
Isotope Composition ◽  
Original Data ◽  
Kara Sea ◽  
Sedimentation Rates ◽  
Shallow Marine ◽  
Novaya Zemlya ◽  
Genetic Types ◽  
Sea Bottom

In the article original data on isotope composition of natural excess Pb-210 and artificial Cs-137 radionuclides in upper 2550-cm layer of sea-bottom sediments at the Kara Sea (from Ob and Yenisei estuaries, Eastern-Novaya-Zemlya trough, Voronin trough, as well as Sedov bay (Novaya Zemlya)) are presented. The research results showed close tie between sedimentation rates and facial-genetic types of the sea-bottom sediments. Highest sedimentation rates are typical for the terrigenic-estuarine type. The type is divided on tractional load with sedimentation rate 0.40.7 cm per year and mud bank sediments with sedimentation rate 0.71.0 cm per year. The terrigenic-shallow-marine type is characterized by lowest sedimentation rate 0.10.3 cm per year. The background terrigenic-marine type has a broadest spectrum of the sedimentation rates: on trough slope the rates are minimal (likely to terrigenic-shallow-marine type), within central parts of the trough (as a result of gravity creep) the rates may increase up to 0.9 cm per year. Single facial-genetic type is glacial sediments of Navaya Zemlya bays. Measured recent sedimentation rate within inner depression of the Sedov bay is 0.10.2 cm per year.

scholarly journals Bottom Sediments Reveal Inter-Annual Variability of Interaction between the Ob and Yenisei Plumes in the Kara Sea

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
A. A. Osadchiev ◽  
En. E. Asadulin ◽  
A. Yu. Miroshnikov ◽  
I. B. Zavialov ◽  
E. O. Dubinina ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Vertical Structure ◽  
Suspended Sediments ◽  
Kara Sea ◽  
Local Wind ◽  
River Plumes ◽  
Buoyant Plumes ◽  
Sea Bottom ◽  
Mixing Dynamics ◽  
Good Agreement

AbstractRiver discharge is the main source of terrigenous sediments in many coastal areas adjacent to estuaries and deltas of large rivers. Spreading and mixing dynamics of river plumes governs transport of suspended sediments and their deposition at sea bottom at these areas. Generally river plumes have very large synoptic and seasonal variability, which cannot be reconstructed from structure of bottom sediments due to their small accumulation velocity. However, bottom sediments can be indicative of variability of river plumes on inter-annual and decadal time scales. In this study we focus on the large Ob and Yenisei buoyant plumes formed in the central part of the Kara Sea. These plumes interact and mix in the area adjacent to the closely located Ob and Yenisei gulfs. Suspended sediments carried by these river plumes have significantly different geochemical characteristics that can be used to detect Ob or Yenisei origin of bottom sediments. Using new geochemical methods we revealed dependence between spreading patterns of these plumes and spatial distribution and vertical structure of bottom sediments in the study area. This relation is confirmed by a good agreement between local wind and discharge conditions reconstructed for 1948–2001 and vertical structure of bottom sediments.

Radionuclides Distribution and its Sorption Behavior in the Surface Layer of the Kara Sea Bottom Sediments

2019 ◽  
Vol 57 (11) ◽  
pp. 1213-1220
Author(s):  
N. V. Kuzmenkova ◽  
V. V. Krupskaya ◽  
E. V. Duriagina ◽  
I. N. Semenkov ◽  
S. E. Vinokurov
Keyword(s):  
Surface Layer ◽  
Bottom Sediments ◽  
Kara Sea ◽  
Sorption Behavior ◽  
Sea Bottom

Content of Technogenic Radionuclides in Water, Bottom Sediments, and Benthos of the Kara Sea and Shallow Bays of the Novaya Zemlya Archipelago

2019 ◽  
Vol 57 (12) ◽  
pp. 1320-1326
Author(s):  
T. A. Goryachenkova ◽  
A. P. Borisov ◽  
G. Yu. Solov’eva ◽  
E. A. Lavrinovich ◽  
I. E. Kazinskaya ◽  
...  
Keyword(s):  
Bottom Sediments ◽  
Kara Sea ◽  
Novaya Zemlya Archipelago ◽  
Novaya Zemlya ◽  
Water Bottom

Genesis of organic matter in the Kara Sea bottom sediments

Oceanology ◽  
2011 ◽  
Vol 51 (4) ◽  
pp. 608-615 ◽  
Author(s):  
A. A. Vetrov ◽  
E. A. Romankevich
Keyword(s):  
Organic Matter ◽  
Bottom Sediments ◽  
Kara Sea ◽  
Sea Bottom

scholarly journals Content of technogenic radionuclides in water, bottom sediments and benthos of the Kara sea and shallow bays of the Novaya zemlya archipelago

2019 ◽  
Vol 64 (12) ◽  
pp. 1261-1268
Author(s):  
T. A. Goryachenkova ◽  
A. P. Borisov ◽  
G. Yu. Solov`eva ◽  
E. A. Lavrinovich ◽  
I. E. Kazinskaya ◽  
...  
Keyword(s):  
Detection Limit ◽  
Bottom Sediments ◽  
Sea Water ◽  
Global Fallout ◽  
Kara Sea ◽  
Radioactive Cesium ◽  
Novaya Zemlya Archipelago ◽  
Novaya Zemlya ◽  
Open Sea ◽  
Order Of Magnitude

During the expedition on the Akademik Mstislav Keldysh research vessel in 2016 year it was established that the content of radioactive cesium in the sea water of the Novaya Zemlya archipelago bays and open sea are at a level corresponding to the global fallout (1 Bq /m3). Plutonium content in water is slightly higher .The activity of neptunium in water is an order of magnitude higher than the activity of plutonium (0.761.89 Bq/m3), although its content in global fallout is almost two orders of magnitude lower than the plutonium content. The plutonium content in the bottom sediments of the Kara Sea is 0.23.8 Bq/kg. The content of radioactive cesium is as high as possible in the mouth of the Yenisei River (up to 21 Bq/kg) Analysis of benthic samples showed that the content of radioactive cesium and plutonium in samples taken in the bays of the Novaya Zemlya archipelago is below the detection limit. The neptunium content in the benthos samples is above the detection limit and amounts to 180 Bq/kg wet weight. It was showed that the content of neptunium in benthos is one of the indicators of radioactive contamination of the marine environment.

scholarly journals Radionuclides distribution and its sorption behavior in the Kara sea bottom sediments surface layer

2019 ◽  
Vol 64 (11) ◽  
pp. 1187-1195
Author(s):  
N. V. Kuzmenkova ◽  
V. V. Krupskaya ◽  
E. V. Duriagina ◽  
I. N. Semenkov ◽  
S. E. Vinokurov
Keyword(s):  
Bottom Sediments ◽  
Sea Water ◽  
Sorption Isotherms ◽  
Sorption Kinetics ◽  
Kara Sea ◽  
Sorption Behavior ◽  
Freundlich Equation ◽  
Sea Bottom ◽  
Complexation Mechanism ◽  
Sorption Characteristics

The sorption characteristics of the Kara sea bottom sediments were investigated. The sediments were collected during scientific expedition of the R/V Akademik Mstislav Keldysh (Cruise AMK-66). The mineral and fraction composition of sediments was determined. It has been found that 137Cs sorbed predominantly by an ion exchange mechanism because of the clay minerals presence in the sediments. At the same time, 243Am and 90Sr sorbed from seawater by the surface complexation mechanism. The sorption kinetics for 243Am was established: about 20 hours, 137Cs: 2 hours, 90Sr: less than an hour. The sorption isotherms shows Cs and Am in experiments on marine and distilled water are described by the Henry equation. The Sr behavior in deionized water is described by the Langmuir equation, in the case of sea water, by the Freundlich equation.

Plutonium and americium in the deep Black Sea bottom sediments

2021 ◽  
Vol 229-230 ◽  
pp. 106540
Author(s):  
Vladislav Yu. Proskurnin ◽  
Nataliya N. Tereshchenko ◽  
Artem A. Paraskiv ◽  
Olga D. Chuzhikova-Proskurnina
Keyword(s):  
Black Sea ◽  
Bottom Sediments ◽  
Sea Bottom

The determination of sedimentation rates in Lake Ontario using the 210Pb dating method

1978 ◽  
Vol 15 (3) ◽  
pp. 431-437 ◽  
Author(s):  
John G. Farmer
Keyword(s):  
Sedimentation Rate ◽  
Lake Ontario ◽  
Sedimentary Basins ◽  
210Pb Dating ◽  
Sedimentation Rates ◽  
Surface Mixing ◽  
Dating Method ◽  
210Pb Dating Method

The 210Pb dating method has been applied successfully to the determination of recent sedimentation rates at four sites distributed among the three major sedimentary basins (Niagara, Mississauga and Rochester) of Lake Ontario. Following correction for effects due to compaction of the sediments, mean sedimentation rates ranging from 0.02 cm/year at the periphery of the Mississauga basin to 0.11 cm/year in the Niagara and Rochester basins were determined. Allowance for compaction reduced the non-compaction-corrected sedimentation rates by 20–35%. Neither 210Pb nor fallout 137Cs profiles indicated surface mixing of sediment sufficient to noticeably affect the calculated sedimentation rates. At all four sites, the sedimentation rate seems to have remained constant during the last 100–150 years.

Content and variability of nutrients in the water area of ​​Blagopoluchiya Bay (Novaya Zemlya, Kara Sea)

2021 ◽  
Author(s):  
Gennadii Borisenko ◽  
Alexander Polukhin ◽  
Valentina Sergeeva
Keyword(s):  
Russian Federation ◽  
Basic Research ◽  
Open Water ◽  
Water Area ◽  
Kara Sea ◽  
Arctic Ecosystems ◽  
Shirshov Institute ◽  
Surrounding Water ◽  
Novaya Zemlya Archipelago ◽  
Novaya Zemlya

<p>In the frames of the scientific program “Investigation of the Russian Arctic ecosystems” in 2007-2020 held by Shirshov Institute of Oceanology, comprehensive studies of the bays of the Novaya Zemlya archipelago (NZA) were carried out. There is very little information in the scientific literature on the dynamics and hydrochemical structure of the waters of the bays. Our investigations have revealed that the concentration of nutrients (first of all, nitrates and silicate) in the bays of NZA was higher than in the surrounding water area of ​​the Kara Sea. The most well studied and open for investigations is the Blagopoluchiya Bay in the northern island of NZA. Blagopoluchiya Bay is a fjord-type bay with several streams of the glacier origin.</p><p>The concentrations of nutrients (N, P, Si, C) in the streams were observed in August-September (0-1.53 µM of PO<sub>4</sub><sup>3-</sup>, 6.4-50.2 µM of SiO<sub>3</sub><sup>2-</sup>, 0.6-11.2 µM of NO<sub>2</sub><sup>-</sup>+NO<sub>3</sub><sup>-</sup>, 732-4815 µM of DIC). The observed content of nutrients in the waters of the bay was on average 2 times lower, but not lower than the level limiting the development of phytoplankton.</p><p>We suppose that high concentrations of nutrients in NZA bays in August-September were supported by increasing glacial runoff from NZA during the summer open water period and the removal of products of degradation of shore rocks with it. Despite the constant enrichment of nutrients, the concentration of phytoplankton in Blagopoluchiya Bay was extremely low (0.2-0.7 mkgC/l) in comparison with the adjacent marine part of the Kara Sea in all years of research.  Perhaps it was due to osmostress of planktonic algae during desalination of the bay by the NZA runoff.</p><p>This work was supported by the State Agreement of The Ministry of Science and Education of Russian Federation (theme №0128-2019-0008); Russian Foundation for Basic Research project 18-05-60069 (processing hydrochemistry data); Russian Scientific Foundation project 19-17-00196 (data obtaining); by the Grant of the President of the Russian Federation MK-860.2020.5 (processing carbonate chemistry data).</p>

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