scholarly journals Testing the potential of OSL, TT-OSL, IRSL and post-IR IRSL luminescence dating on a Middle Pleistocene sediment record of Lake El'gygytgyn, Russia

2012 ◽  
Vol 8 (5) ◽  
pp. 4779-4815
Author(s):  
A. Zander ◽  
A. Hilgers
Keyword(s):  
Sediment Cores ◽  
Far East ◽  
Luminescence Dating ◽  
The Arctic ◽  
Middle Pleistocene ◽  
The North ◽  
Lake El’Gygytgyn ◽  
Infra Red ◽  
Major Factors ◽  
Pleistocene Sediment

Abstract. Lake El'gygytgyn is a 12 km wide crater lake located in remote Chukotka in the far East Russian Arctic about 100 km to the north of the Arctic Circle. It was formed by a meteorite impact about 3.58 Ma ago. This study tests the paleomagnetic and proxy data-based Mid- to Late-Pleistocene sediment deposition history using novel luminescence dating techniques of sediment cores taken from the centre of the 175 m deep lake. For dating polymineral and quartz fine grains (4–11 μm grain size range) were extracted from nine different levels from the upper 28 m of sediment cores 5011-1A and 5011-1B. Polymineral sub-samples were analysed by infra-red stimulated luminescence (IRSL) and post-IR infra-red stimulated luminescence (post-IR IRSL) using single aliquot regenerative dose (SAR) sequences. SAR protocols were further applied to measure the blue light optically stimulated luminescence (OSL) and thermally-transferred OSL (TT-OSL) of fine-grained quartz supplemented by a multiple aliquot TT-OSL approach. According to an independent age model, the lowest sample from 27.8–27.9 m below lake bottom level correlates to the Brunhes-Matuyama (B/M) reversal. Finally, the SAR post-IR-IRSL protocol applied to polymineral fine grains was the only luminescence technique able to provide dating results of acceptable accuracy up to ca. 700 ka. Major factors limiting precision and accuracy of the luminescence chronology are, for some samples, natural signals already approaching saturation level, and overall the uncertainty related to the sediment water content and its variations over geological times.

scholarly journals Potential and limits of OSL, TT-OSL, IRSL and pIRIR<sub>290</sub> dating methods applied on a Middle Pleistocene sediment record of Lake El'gygytgyn, Russia

2013 ◽  
Vol 9 (2) ◽  
pp. 719-733 ◽  
Author(s):  
A. Zander ◽  
A. Hilgers
Keyword(s):  
Dose Response ◽  
Sediment Cores ◽  
Luminescence Dating ◽  
Middle Pleistocene ◽  
Response Curves ◽  
Proxy Data ◽  
Lake El’Gygytgyn ◽  
Age Model ◽  
Dose Response Curves ◽  
Pleistocene Sediment

Abstract. This study tests the paleomagnetic and proxy-data based Mid- to Upper Pleistocene sediment deposition history of Lake El'gygytgyn by applying different approaches of luminescence dating techniques on sediment cores taken from the centre of the 175 m deep lake. For dating polymineral and quartz fine grains (4–11 μm grain size range) were extracted from nine different levels from the upper 28 m of sediment cores 5011-1A and 5011-1B. According to the independent age model, the lowest sample from 27.8–27.9 m below lake bottom level correlates to the Brunhes-Matuyama (B/M) reversal. Polymineral sub-samples were analysed by infra-red stimulated luminescence (IRSL) and post-IR IRSL measured at 290 °C (pIRIR290) using single aliquot regenerative dose (SAR) sequences. SAR protocols were further applied to measure the blue light optically stimulated luminescence (OSL) and thermally-transferred OSL (TT-OSL) of fine-grained quartz supplemented by a multiple aliquot approach. Neither low temperature IRSL measurements at 50 °C nor any OSL dating approach on quartz yielded reliable results. Deconvolution of their dose response curves revealed a pseudo-increase of the dose response curves and explains the observed underestimation. The pIRIR protocol applied to polymineral fine grains was the only luminescence technique able to provide dating results of acceptable accuracy up to ca. 700 ka when correlated to the existing proxy-data and paleomagnetic based age record. We present the potential and limits of the different dating techniques and a correlation of pIRIR290 results with the proxy-data based age model.

scholarly journals Pliocene to Pleistocene climate and environmental history of Lake El'gygytgyn, Far East Russian Arctic, based on high-resolution inorganic geochemistry data

2014 ◽  
Vol 10 (4) ◽  
pp. 1381-1399 ◽  
Author(s):  
V. Wennrich ◽  
P. S. Minyuk ◽  
V. Borkhodoev ◽  
A. Francke ◽  
B. Ritter ◽  
...  
Keyword(s):  
North Pacific ◽  
Far East ◽  
Early Pleistocene ◽  
Middle Pleistocene ◽  
Gradual Transition ◽  
Russian Arctic ◽  
Lake Productivity ◽  
The North ◽  
Lake El’Gygytgyn ◽  
The North Pacific

Abstract. The 3.6 Ma sediment record of Lake El'gygytgyn/NE Russia, Far East Russian Arctic, represents the longest continuous climate archive of the terrestrial Arctic. Its elemental composition as determined by X-ray fluorescence scanning exhibits significant changes since the mid-Pliocene caused by climate-driven variations in primary production, postdepositional diagenetic processes, and lake circulation as well as weathering processes in its catchment. During the mid- to late Pliocene, warmer and wetter climatic conditions are reflected by elevated Si / Ti ratios, indicating enhanced diatom production in the lake. Prior to 3.3 Ma, this signal is overprinted by intensified detrital input from the catchment, visible in maxima of clastic-related proxies, such as K. In addition, calcite formation in the early lake history points to enhanced Ca flux into the lake caused by intensified weathering in the catchment. A lack of calcite deposition after ca. 3.3 Ma is linked to the development of permafrost in the region triggered by cooling in the mid-Pliocene. After ca. 3.0 Ma the elemental data suggest a gradual transition to Pleistocene-style glacial–interglacial cyclicity. In the early Pleistocene, the cyclicity was first dominated by variations on the 41 kyr obliquity band but experienced a change to a 100 kyr eccentricity dominance during the middle Pleistocene transition (MPT) at ca. 1.2–0.6 Ma. This clearly demonstrates the sensitivity of the Lake El'gygytgyn record to orbital forcing. A successive decrease of the baseline levels of the redox-sensitive Mn / Fe ratio and magnetic susceptibility between 2.3 and 1.8 Ma reflects an overall change in the bottom-water oxygenation due to an intensified occurrence of pervasive glacial episodes in the early Pleistocene. The coincidence with major changes in the North Pacific and Bering Sea paleoceanography at ca. 1.8 Ma implies that the change in lake hydrology was caused by a regional cooling in the North Pacific and the western Beringian landmass and/or changes in the continentality. Further increases in total organic carbon and total nitrogen content after ca. 1.6 Ma are attributed to reduced organic matter decay in the sediment during prolonged anoxic periods. This points to more extensive periods of perennial ice coverage, and thus, to a progressive shifts towards more intense peak glacial periods. In the course of the Pleistocene glacial–interglacial sequence eight so-called "super-interglacials" occur. Their exceptionally warm conditions are reflected by extreme Si / Ti peaks accompanied by lows in Ti, K, and Fe, thus indicating extraordinary high lake productivity.

scholarly journals Pliocene to Pleistocene climate and environmental history of Lake El'gygytgyn, Far East Russian Arctic, based on high-resolution inorganic geochemistry data

2013 ◽  
Vol 9 (5) ◽  
pp. 5899-5940 ◽  
Author(s):  
V. Wennrich ◽  
P. S. Minyuk ◽  
V. Ya. Borkhodoev ◽  
A. Francke ◽  
B. Ritter ◽  
...  
Keyword(s):  
Environmental History ◽  
Far East ◽  
Climatic Conditions ◽  
Early Pleistocene ◽  
Middle Pleistocene ◽  
Gradual Transition ◽  
Russian Arctic ◽  
Lake Productivity ◽  
The North ◽  
Lake El’Gygytgyn

Abstract. The 3.6 Ma sediment record of Lake El'gygytgyn, Far East Russian Arctic, represents the longest continuous climate archive of the terrestrial Arctic. Its elemental composition monitored by X-ray fluorescence scanning exhibits significant changes since the Mid-Pliocene caused by climate driven variations in the primary production, postsedimentary diagenetic processes, and current activity in the lake as well as weathering processes in its catchment. During the Mid to Late Pliocene, warmer and wetter climatic conditions are reflected by elevated Si / Ti ratios, indicating enhanced diatom production in the lake. Prior to 3.3 Ma, this signal is highly masked by intensified detrital input from the catchment, visible in maxima of clastic-related proxies such as the K concentration. In addition, calcite formation in the early lake history points to enhanced nutrient flux into the lake caused by intensified weathering in its catchment. Its termination at ca. 3.3 Ma is supposed to be linked to the development of permafrost in the region triggered by a first cooling in the Mid-Pliocene. After ca. 3.0 Ma the elemental data suggest a gradual transition to Quaternary-style glacial / interglacial cyclicity. In the early Pleistocene, the cyclicity was first dominated by variations on the 41 ka obliquity band but experienced a change to a 100 ka eccentricity dominance after the Middle Pleistocene Transition at ca. 1.2 to 0.7 Ma. This clearly demonstrates the sensitivity of the Lake El'gygytgyn record to orbital forcing. A successive decrease of the baseline-levels of the redox-sensitive Mn / Fe ratio and magnetic susceptibility between 2.3 to 1.8 Ma reflects an overall change in the bottom water oxygenation due to an intensified occurrence of pervasive glacial episodes in the early Quaternary. The coincidence with major changes in the North Pacific and Bering Sea paleoceanography at ca. 1.8 Ma implies that the change in lake hydrology was caused by regional cooling and/or changes in the ocean-land moisture transport. Further rising TOC and TN values after ca. 1.6 Ma are attributed to a progressive intensification of the glacial intensity. In the course of the Quaternary glacial/interglacial sequence eight so-called "super-interglacials" occur. Their exceptional warm conditions are reflected by extreme Si / Ti peaks accompanied by lows in Ti, K, and Fe, thus indicating an extraordinary high lake productivity.

scholarly journals Holocene polynya dynamics and their interaction with oceanic heat transport in northernmost Baffin Bay

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rebecca Jackson ◽  
Anna Bang Kvorning ◽  
Audrey Limoges ◽  
Eleanor Georgiadis ◽  
Steffen M. Olsen ◽  
...  
Keyword(s):  
Sediment Cores ◽  
Active Role ◽  
Atlantic Water ◽  
The Arctic ◽  
Negative Consequences ◽  
Baffin Bay ◽  
The North ◽  
North Water ◽  
History Of ◽  
Ocean Conditions

AbstractBaffin Bay hosts the largest and most productive of the Arctic polynyas: the North Water (NOW). Despite its significance and active role in water mass formation, the history of the NOW beyond the observational era remains poorly known. We reconcile the previously unassessed relationship between long-term NOW dynamics and ocean conditions by applying a multiproxy approach to two marine sediment cores from the region that, together, span the Holocene. Declining influence of Atlantic Water in the NOW is coeval with regional records that indicate the inception of a strong and recurrent polynya from ~ 4400 yrs BP, in line with Neoglacial cooling. During warmer Holocene intervals such as the Roman Warm Period, a weaker NOW is evident, and its reduced capacity to influence bottom ocean conditions facilitated northward penetration of Atlantic Water. Future warming in the Arctic may have negative consequences for this vital biological oasis, with the potential knock-on effect of warm water penetration further north and intensified melt of the marine-terminating glaciers that flank the coast of northwest Greenland.

scholarly journals Vegetation responses to interglacial warming in the Arctic: examples from Lake El'gygytgyn, Far East Russian Arctic

2013 ◽  
Vol 9 (3) ◽  
pp. 1211-1219 ◽  
Author(s):  
A. V. Lozhkin ◽  
P. M. Anderson
Keyword(s):  
Deciduous Forest ◽  
Russian Far East ◽  
Coniferous Forest ◽  
Far East ◽  
The Arctic ◽  
Dark Coniferous Forest ◽  
Vegetation Responses ◽  
Wide Range ◽  
Lake El’Gygytgyn ◽  
Shrub Tundra

Abstract. Preliminary analyses of Lake El'gygytgyn sediment indicate a wide range of ecosystem responses to warmer than present climates. While palynological work describing all interglacial vegetation is ongoing, sufficient data exist to compare recent warm events (the postglacial thermal maximum, PGTM, and marine isotope stage, MIS5) with "super" interglaciations (MIS11, MIS31). Palynological assemblages associated with these climatic optima suggest two types of vegetation responses: one dominated by deciduous taxa (PGTM, MIS5) and the second by evergreen conifers (MIS11, MIS31). MIS11 forests show a similarity to modern Picea–Larix–Betula–Alnus forests of Siberia. While dark coniferous forest also characterizes MIS31, the pollen taxa show an affinity to the boreal forest of the lower Amur valley (southern Russian Far East). Despite vegetation differences during these thermal maxima, all glacial–interglacial transitions are alike, being dominated by deciduous woody taxa. Initially Betula shrub tundra established and was replaced by tundra with tree-sized shrubs (PGTM), Betula woodland (MIS5), or Betula–Larix (MIS11, MIS31) forest. The consistent occurrence of deciduous forest and/or high shrub tundra before the incidence of maximum warmth underscores the importance of this biome for modeling efforts. The El'gygytgyn data also suggest a possible elimination or massive reduction of Arctic plant communities under extreme warm-earth scenarios.

scholarly journals RELATIONAL STRATEGIES AS A FACTOR OF THE INDUSTRIAL POLICY OF ENTERPRISES OF THE RUSSIAN NORTH AND ARCTIC

2020 ◽  
Vol 68 (2/2020) ◽  
pp. 83-94
Author(s):  
V. A. Leventsov ◽  
◽  
V.V. Gluhov ◽  
Keyword(s):  
Development Strategy ◽  
Industrial Policy ◽  
Far East ◽  
Economic Recession ◽  
Arctic Region ◽  
The Arctic ◽  
Industrial Enterprises ◽  
The North ◽  
In The Beginning ◽  
Relational Strategies

In the beginning of this year, key development priorities of the Arctic region of Russia were presented, which should become the basis for the Development Strategy of the Russia Arctic until 2035 prepared by the Ministry of the Far East and Arctic Development. Its main goal is to improve the level and quality of life through development of human capital, balanced spatial development, development of the economy of renewable natural resources (local production), implementation of large investmentand infrastructure projects, environmental management, etc.Accordingly, industrial enterprises of the North and the Arctic of Russia are faced with the most important task of producing competitive, innovative products, which requires consolidation of allkinds of resources that are always lacking, especially during the economic recession, low oil prices and the coronavirus pandemic.The purpose of the article is to show the role of the use of the relational strategy by industrial enterprises of the Northand the Arctic of Russia as an important factor in their industrial policy.Relational strategies of enterprises mean strategies aimed at forming their relational space as a set of links between them that create partnership advantages in order to obtain relational profit for participants.The article presents the authors’ model for forming relational strategies, consisting of five stages with their description, an algorithm for assessing relational interaction, and also considers the use of relational strategy as an important factor in the industrial policy of enterprises of the North and the Arctic of Russia.

Entrepreneurial ecosystems in the Russian regions

2018 ◽  
pp. 4-14 ◽  
Author(s):  
S. P. Zemtsov ◽  
V. L. Baburin
Keyword(s):  
Small And Medium Enterprises ◽  
Far East ◽  
The Arctic ◽  
Russian Regions ◽  
North Caucasus ◽  
Entrepreneurial Ecosystems ◽  
The North ◽  
Doing Business ◽  
Consumer Markets ◽  
Medium Enterprises

The article explains the uneven development of small and medium enterprises in Russia within the framework of the ‘entrepreneurial ecosystems’ concept. A corresponding typology of the Russian regions was carried out according to the proposed model. The most developed ecosystems with highdensity and sectoral diversity of SMEs are formed in regions with access to large consumer markets, capital, and low risks for investors. The least developed SMEs sector is in areas with high costs of doing business: the North Caucasus, the Far East and the Arctic zone, which requires special measures of state policy. The level of development of ecosystems determines their ability to withstand external shocks. The effect of the FIFA World Cup is positive in the hosting regions and in its neighbors. Based on the typology, we proposed differentiated support measures.

scholarly journals Forecasting of Capital Investments into the Fixed Capital in Regions Until 2024: Methods and Results of Territorial Forecast for Russia

2020 ◽  
pp. 49-62
Author(s):  
Irina Grishina
Keyword(s):  
Far East ◽  
Fixed Capital ◽  
The Arctic ◽  
Capital Investments ◽  
North Caucasus ◽  
Fixed Investment ◽  
Medium Term ◽  
Investment Projects ◽  
The North ◽  
Regional Investment

The aim of the study is to improve the methodology of forecasting of the territorial proportions of fixed capital investments within the medium-term forecast of the social and economic development of Russia. The author proposes a method of decomposition of predicted national indicators at the regional level which takes into account the prospects of attracting private investments and implementing large investment projects with the state participation. The researcher describes the system of factors determining the interregional differences of private investors’ activity and forming the metric basis of complex estimation of the regional investment attractiveness using the official statistics. The paper presents the list and methods for estimating the indicators characterizing the production, financial, consumer, institutional, innovative, infrastructure and natural-resource components of the region’s investment potential, as well as social, environmental and technological regional investment risks. The paper shows the opportunities of using the functional relationship for the medium-term forecasting between the integral regional indicators of the investment attractiveness and activity. The national forecast has been decomposed by calculating the individual regional deviations of the forecasted national growth rate of fixed investment in Russia for 2019–2024. The developed variants of perspective territorial proportions confirm the possibility to achieve the national target of the forecast presented as a 25 percent share of the fixed investment in GDP of Russia and reflect the core perspective destinations of development for different parts of the country – the accelerated development of the Far East, the Arctic zone, the largest metropolitan areas of Russia, as well as the provision of national security in the geostrategic regions of the North Caucasus and Southern Federal Districts. The approach is designed to support the administrative decisions concerning the spatial development by linking regional and investment policy priorities.

scholarly journals Biomarker Proxy Records of Arctic Climate Change During the Mid-Pleistocene Transition from Lake El’gygytgyn (Far East Russia)

2021 ◽  
Author(s):  
Kurt R. Lindberg ◽  
William C. Daniels ◽  
Isla S. Castañeda ◽  
Julie Brigham-Grette
Keyword(s):  
Global Climate ◽  
Far East ◽  
Warm Season ◽  
The Arctic ◽  
Geochemical Data ◽  
Temperature Record ◽  
Higher Plant ◽  
Temperature Variations ◽  
Lake El’Gygytgyn ◽  
East Russia

Abstract. The Mid-Pleistocene Transition (MPT) is a widely recognized global climate shift occurring between approximately 1,250 to 700 ka. At this time, Earth's climate underwent a major transition from dominant 40 kyr glacial-interglacial cycles to quasi-100 kyr cycles. The cause of the MPT remains a puzzling aspect of Pleistocene climate. Presently, there are few, if any, continuous MPT records from the Arctic yet understanding the role and response of the high latitudes to the MPT is required to better evaluate the causes of this climatic shift. Here, we present new continental biomarker records of temperature and vegetation spanning 1,142 to 752 ka from Lake El'gygytgyn (Far East Russia). We reconstruct warm-season temperature variations across the MPT based on branched glycerol dialkyl glycerol tetraethers (brGDGTs) using the MBTʹ5ME proxy. The new Arctic temperature record does not display an overall cooling trend during the MPT but does exhibit strong glacial-interglacial cyclicity. Spectral analysis demonstrates persistent obliquity and precession pacing over the study interval and reveals substantial sub-orbital temperature variations at ~900 kyr during the first “skipped” interglacial. Interestingly, Marine Isotope Stage (MIS) 31, which is widely recognized as a particularly warm interglacial, does not exhibit exceptional warmth at Lake El'gygytgyn. Instead, we find that MIS 29, 27 and 21 were as warm or warmer than MIS 31. In particular, MIS 21 (~870 to 820 ka) stands out as an especially warm and long interglacial in the continental Arctic while MIS 25 is a notably cold interglacial. Throughout the MPT, Lake El'gygytgyn pollen data exhibits a long-term drying trend, with a shift to an increasingly open landscape noted after around 900 ka (Zhao et al., 2018), which is also reflected in our higher plant leaf wax (n-alkane) distributions. Although the mechanisms driving the MPT remain a matter of debate, our new climate records from the continental Arctic exhibit some similarities to changes noted around the North Pacific region. Overall, the new organic geochemical data from Lake El'gygytgyn contribute to expanding our knowledge of the high-latitude response to the MPT.

scholarly journals Assessment of safety and economy of navigation in ice on the Northen Sea route

2018 ◽  
Vol 19 (6) ◽  
pp. 193-197 ◽  
Author(s):  
Tadeusz Pastusiak
Keyword(s):  
Far East ◽  
Route Planning ◽  
The Arctic ◽  
High Concentration ◽  
Sea Transport ◽  
The North ◽  
Sea Transportation ◽  
The North Sea ◽  
Ice Conditions ◽  
The Impact

This article discusses safety and economic issues of sea transport during transit voyages of a vessel across the North Sea Route (NSR) in the Arctic Ocean. The main obstacles to shipping and threat to vessels are the regions of ice occurrence and, in particular, clusters of ice with high and very high concentration, thickness and hummocking occurring each year in the same places, which are called ice massifs. Speed of vessels has the greatest impact on the economy of transit voyage. The safe speed of vessels, as a means of transport that ensures trouble-free navigation of the vessels depends on ice conditions. Until now, the concept of safe speed has not been precisely defined. Also, the impact of speed of the vessel in certain ice conditions on overcoming the ice and the risk of damage to vessel has not been precisely defined. Issues of direct and potential costs of vessel’s safety, damages and consequences of damages in ice were also not fully considered. The author analyzed the above relationships on the example of the first commercial vessel transit voyage through the NSR and obtained generalized results that can be applied to the initial, general and tactical route planning till 10 days - 6 months ahead and transit schedule of a vessel between Europe and the Far East ports via the Northern Sea Route. The presented method should increase safety and economy of sea transportation in areas covered with ice.

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