Spatial Distribution of Diatom Surface Sediment Assemblages on the Laptev Sea Shelf (Russian Arctic)

1999 ◽  
pp. 533-551 ◽  
Author(s):  
H. Cremer
Keyword(s):  
Spatial Distribution ◽  
Surface Sediment ◽  
Laptev Sea ◽  
Russian Arctic ◽  
The Laptev Sea

scholarly journals Spatial distribution of Icelus bicornis (Reinhardt, 1840) and Icelus spatula Gilbert & Burke, 1912 in the russian Arctic seas

2021 ◽  
Vol 12 (3-2021) ◽  
pp. 150-157
Author(s):  
S.A. Chaus ◽  
Keyword(s):  
Spatial Distribution ◽  
Barents Sea ◽  
Kara Sea ◽  
Laptev Sea ◽  
Russian Arctic ◽  
Arctic Seas ◽  
East Siberian Sea ◽  
The Laptev Sea

This article provides data on distribution of two circumpolar species – twohorn sculpin Icelus bicornis and spatulate sculpin Icelus spatula in the Russian Arctic seas (Barents Sea, Kara Sea, Laptev Sea, East Siberian Sea) in the period from 2014 to 2019. The abundance of the twohorn sculpin varied from 2 to 18 ind/km2, and the biomass varied within 0.002–0.089 kg/km2. For the spatulate sculpin, these parameters were 2–21 ind/km2 and 0.002–0.699 kg/km2. The maximum and minimum values of these parameters for Icelus bicornis were recorded in the Laptev Sea, and for Icelus spatula in the East Siberian Sea. Information on the vertical spatial distribution of these species is also given, confirming the information given earlier that the spatulate sculpin occurs at shallower depths in contrast to the twohorn sculpin.

scholarly journals Spatial variability of primary production and chlorophyll in the Laptev sea in august–september

2019 ◽  
Vol 59 (5) ◽  
pp. 755-770
Author(s):  
A. B. Demidov ◽  
V. I. Gagarin ◽  
E. G. Arashkevich ◽  
P. N. Makkaveev ◽  
I. V. Konyukhov ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Spatial Variability ◽  
Primary Production ◽  
Continental Slope ◽  
Incident Radiation ◽  
Laptev Sea ◽  
Phytoplankton Primary Production ◽  
Average Value ◽  
Nutrients Concentration ◽  
The Laptev Sea

Spatial distribution of phytoplankton primary production and chlorophyll was studied based on the data of three cruises carried out in AugustSeptember of 2015, 2017 and 2018. The average value of water column primary production (IPP) along the transect from Lena`s mouth to the continental slope was 2.8 fold higher than that one along the transect from Khatanga`s mouth, which was explained by the level of incident radiation and nutrients concentration. Along the cross-slope transects increasing of photosynthetically layer integrated chlorophyll (Chlph) occurred due to developing of deep maxima. IPP and Chlph increasing was registered in the vicinity of the continental slope. In AugustSeptember the averaged IPP value was 100 mgC m-2 d-1 that is the evidence of oligotrophy of the Laptev Sea at the end of summer and at the beginning of autumn.

scholarly journals Bioindication of the water salinity dynamics by the microalgae communities in the Lena River Delta, Laptev Sea, Russian Arctic

2021 ◽  
Vol 6 (3) ◽  
pp. 15-28
Author(s):  
S. S. Barinova ◽  
V. A. Gabyshev ◽  
A. P. Ivanova ◽  
O. I. Gabysheva
Keyword(s):  
Species Composition ◽  
River Delta ◽  
Water Bodies ◽  
Water Salinity ◽  
The Arctic ◽  
Laptev Sea ◽  
Russian Arctic ◽  
Lena River ◽  
Lena River Delta ◽  
The Laptev Sea

The Lena River in the Laptev Sea forms a vast delta, one of the largest in the world. The Ust-Lensky State Nature Reserve saves biodiversity on the Lena Delta territory beyond the Arctic Circle, in the zone of continuous permafrost. In recent years, large-scale plans for the development of extractive industries are implemented in this Russian Arctic sector. In this regard, the study of biodiversity and bioindication properties of aquatic organisms in the Lena River estuary area is becoming more and more relevant. This study aims to identify the species composition of microalgae in lotic and lentic water bodies of the Lena River Delta and use their indicator property for water salinity. It was a trace indicator of species distribution over the delta and their dynamics along the delta main watercourses to assess the impact of river waters on the Laptev Sea coastal areas. For this, all previously published materials on algae and chemical composition of the region waters as well as data obtained in recent years for the waters of the lower Lena reach were involved. In total, 700 species considered to 10 phyla were analyzed: Cyanobacteria (83), Euglenozoa (13), Ochrophyta (Chrysophyta, Xanthophyta) (41), Eustigmatophyta (4), Bacillariophyta (297), Miozoa (20), Cryptophyta (3), Rhodophyta (1), Chlorophyta (125), and Charophyta (111). The available materials of the field and reference observations were analyzed using several statistical methods. The study results indicate that hydrological conditions are the main factor regulating the spatial structure of the species composition of the microalgae communities in the Lena River Delta. The distribution of groups of salinity indicators across flowing water bodies reflects the effect of water salinity, and this allows suggesting possible sources of this effect. The mechanism of tracking the distribution of environmental indicators itself is a sensitive method, that reveals even their subtle changes in them; therefore, as an integral method, it can be helpful for further monitoring.

scholarly journals The Mesozoic–Cenozoic tectonic evolution of the New Siberian Islands, NE Russia

2014 ◽  
Vol 152 (3) ◽  
pp. 480-491 ◽  
Author(s):  
CHRISTIAN BRANDES ◽  
KARSTEN PIEPJOHN ◽  
DIETER FRANKE ◽  
NIKOLAY SOBOLEV ◽  
CHRISTOPH GAEDICKE
Keyword(s):  
Tectonic Evolution ◽  
Structural Evolution ◽  
Arctic Shelf ◽  
Laptev Sea ◽  
Russian Arctic ◽  
Thrust Belt ◽  
Fold Belt ◽  
New Siberian Islands ◽  
Ne Russia ◽  
The Laptev Sea

AbstractOn the New Siberian Islands the rocks of the east Russian Arctic shelf are exposed and allow an assessment of the structural evolution of the region. Tectonic fabrics provide evidence of three palaeo-shortening directions (NE–SW, WNW–ESE and NNW–SSE to NNE–SSW) and one set of palaeo-extension directions revealed a NE–SW to NNE–SSW direction. The contractional deformation is most likely the expression of the Cretaceous formation of the South Anyui fold–thrust belt. The NE–SW shortening is the most prominent tectonic phase in the study area. The WNW–ESE and NNW–SSE to NNE–SSW-oriented palaeo-shortening directions are also most likely related to fold belt formation; the latter might also have resulted from a bend in the suture zone. The younger Cenozoic NE–SW to NNE–SSW extensional direction is interpreted as a consequence of rifting in the Laptev Sea.

Structure and geology of the continental shelf of the Laptev Sea, Eastern Russian Arctic

1998 ◽  
Vol 298 (4) ◽  
pp. 357-393 ◽  
Author(s):  
Sergei S Drachev ◽  
Leonid A Savostin ◽  
Victor G Groshev ◽  
Inna E Bruni
Keyword(s):  
Continental Shelf ◽  
Laptev Sea ◽  
Russian Arctic ◽  
The Laptev Sea

scholarly journals Studies of the ice regime in the waters of the Gulf of Khatanga in the Laptev Sea

2018 ◽  
Vol 58 (3) ◽  
pp. 396-404 ◽  
Author(s):  
K. A. Kornishin ◽  
P. A. Tarasov ◽  
Ya. O. Yefimov ◽  
Yu. P. Gudoshnikov ◽  
S. M. Kovalev ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Sea Water ◽  
Hydrological Regime ◽  
Ice Cover ◽  
Water Area ◽  
Laptev Sea ◽  
Entire Area ◽  
Sea Level Fluctuations ◽  
Ice Regime ◽  
The Laptev Sea

The study was carried out to reveal characteristics of the ice regime of poorly explored water area of the Khatanga Bay in the South-Western part of the Laptev Sea. Actuality of the research is due to the high potential of hydrocarbon reserves in the license area «Khatangsky» of the PAO «NK «Rosneft Currently available methods of monitoring ice cover and hydrometeorological conditions throughout the year were used. The main features of the hydrological regime of the region in the ice-free period, reflected in the spatial distribution of thermohaline characteristics and sea level fluctuations, are shown. The area under investigation has specific features of the conditions for the formation of ice cover: the entire area is covered with the fast ice; the winter fresh water infl w from Khatanga and Anabar rivers results in the desalination of sea water, and this promotes formation of ice cover, which differs in crystal structure and texture from both fresh and sea ices. These factors do influence on the mechanical properties of ice, including its strength. It was found that the average and maximum values of strength of the smooth and deformed ice of the Khatanga Gulf are approximately twice as high as the similar values of the sea ice strength in the southern part of the Laptev Sea. The basic features of the spatial distribution of different types of deformations of the ice cover such as lines of ice hummocks, zones of homogeneous ice hummocking, and stamukhas had been determined.

scholarly journals Halogen-based reconstruction of Russian Arctic sea ice area from the Akademii Nauk ice core (Severnaya Zemlya)

2016 ◽  
Vol 10 (1) ◽  
pp. 245-256 ◽  
Author(s):  
A. Spolaor ◽  
T. Opel ◽  
J. R. McConnell ◽  
O. J. Maselli ◽  
G. Spreen ◽  
...  
Keyword(s):  
Sea Ice ◽  
Ice Core ◽  
Arctic Sea Ice ◽  
The Arctic ◽  
Laptev Sea ◽  
Russian Arctic ◽  
Ice Dynamics ◽  
Spring Sea Ice ◽  
Severnaya Zemlya ◽  
The Laptev Sea

Abstract. The role of sea ice in the Earth climate system is still under debate, although it is known to influence albedo, ocean circulation, and atmosphere–ocean heat and gas exchange. Here we present a reconstruction of 1950 to 1998 AD sea ice in the Laptev Sea based on the Akademii Nauk ice core (Severnaya Zemlya, Russian Arctic). The chemistry of halogens bromine (Br) and iodine (I) is strongly active and influenced by sea ice dynamics, in terms of physical, chemical and biological process. Bromine reacts on the sea ice surface in autocatalyzing "bromine explosion" events, causing an enrichment of the Br / Na ratio and hence a bromine excess (Brexc) in snow compared to that in seawater. Iodine is suggested to be emitted from algal communities growing under sea ice. The results suggest a connection between Brexc and spring sea ice area, as well as a connection between iodine concentration and summer sea ice area. The correlation coefficients obtained between Brexc and spring sea ice (r  =  0.44) as well as between iodine and summer sea ice (r  =  0.50) for the Laptev Sea suggest that these two halogens could become good candidates for extended reconstructions of past sea ice changes in the Arctic.

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