Deformation of Continental Lithosphere on the Laptev Sea Shelf, Russian Arctic

1998 ◽  
Author(s):  
K. Hinz ◽  
M. Block ◽  
D. Franke ◽  
S. Neben ◽  
C. Reichert ◽  
...  
Keyword(s):  
Laptev Sea ◽  
Russian Arctic ◽  
Continental Lithosphere ◽  
The Laptev Sea

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 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.

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.

New observations of Meringosphaera mediterranea from Russian Arctic seas, including a review of global distribution

2021 ◽  
Vol 55 (2) ◽  
pp. 287-306
Author(s):  
A. A. Georgiev ◽  
M. L. Georgieva ◽  
M. A. Gololobova
Keyword(s):  
Type Species ◽  
Systematic Position ◽  
Global Distribution ◽  
Laptev Sea ◽  
Russian Arctic ◽  
Arctic Seas ◽  
East Siberian Sea ◽  
Common Opinion ◽  
First Time ◽  
The Laptev Sea

Meringosphaera mediterranea is the type species of the genus. The species is widely distributed in the polar, temperate, and tropical marine waters. For many years the systematic position of this species was unclear (the most common opinion was that the species is xanthophyte or chrysophyte alga), and its affiliation to centrohelids was clarified quite recently. In this paper, we report on the finding of M. mediterranea in the East Siberian Sea and for the first time in the Laptev Sea and provide a description of this species accompanying by LM and SEM microphotographs. Also, we summarize all available published information on the global distribution of M. mediterranea.

scholarly journals The Laptev Sea flaw polynya, Russian Arctic: effects on the mesoscale hydrography

2001 ◽  
Vol 33 ◽  
pp. 373-376 ◽  
Author(s):  
I. Dmitrenko ◽  
J.A. Hölemann ◽  
K. Tyshko ◽  
V. Churun ◽  
S. Kirillov ◽  
...  
Keyword(s):  
Surface Water ◽  
Water Layer ◽  
Circulation System ◽  
Laptev Sea ◽  
Russian Arctic ◽  
Surface Water Salinity ◽  
Salinity Increase ◽  
Vertical Density ◽  
Ice Production ◽  
The Laptev Sea

AbstractA detailed analysis of hydrographic data from a period of 20 years (1980−99) has shown that the persistent presence of a flaw polynya influences mesoscale hydrography of the Laptev Sea, Russian Arctic. Based on these data, the interannual variability of surface water salinity within the polynya has been estimated. As the salinity increase in the surface water layer is mainly caused by the formation of new ice within the polynya, the average ice-production rate of the polynya was calculated. The results indicate an ice production of 3−4 m per season. A further aim of this study was to calculate the probability that the convective mixing in the polynya penetrates to the sea-floor. It is demonstrated that the probability is maximal in the flaw-polynya area, but does not exceed 20% in the eastern and 70% in the western part of the polynya as a result of strong vertical density stratification from river runoff, especially in the eastern Laptev Sea. Additional studies of water circulation in the marginal zone of the flaw polynya were carried out during field observations in April-May 1999. On the basis of conductivity-temperature-depth and current measurements we deduce that high current velocities (62 cm s-1) recorded in surface waters near the fast-ice edge are caused by a convectively driven circulation system under the polynya. Our measurements indicate that these high-velocity currents are part of a cellular circulation, which results from the rejection of brine during intensive ice formation in the polynya. The observed azimuthal alignment of the crystalline structure of sea ice is also, most probably, the consequence of this quasi-stationary cellular circulation.

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