Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia

Abstract. Rapidly changing climate in the northern hemisphere and associated socio-economic impacts require reliable understanding of lake systems as important freshwater resources and sensitive sentinels of environmental changes. To better understand time-series data in lake sediment cores it is necessary to gain information on within-lake spatial variabilities of environmental indicator data. Therefore, we retrieved a set of 38 samples from the sediment surface along spatial habitat gradients in the boreal, deep, and yet pristine Lake Bolshoe Toko in southern Yakutia, Russia. Our methods comprise laboratory analyses of the sediments for multiple proxy parameters including diatom and chironomid taxonomy, oxygen isotopes from diatom silica, grain size distributions, elemental compositions (XRF), organic carbon contents, and mineralogy (XRD). We analysed the lake water for cations, anions and isotopes. Our results show that the diatom assemblages are strongly influenced by water depth and dominated by planktonic species, i.e. Pliocaenicus bolshetokoensis. Species richness and diversity is higher in the northern part of the lake basin, associated with the availability of benthic, i.e. periphytic, niches in shallower waters. δ18Odiatom values are higher in the deeper south-western part of the lake probably related to water temperature differences. The highest amount of the chironomid taxa underrepresented in the training set used for palaeoclimate inference was found close to the Utuk river and at southern littoral and profundal sites. Abiotic sediment components are not symmetrically distributed in the lake basin but vary along restricted areas of differential environmental forcings. Grain size and organic matter is mainly controlled by both, river input and water depth. Mineral (XRD) data distributions are influenced by the methamorphic lithology of the Stanovoy mountain range, while elements (XRF) are intermingled due to catchment and diagenetic differences. We conclude that the lake represents a suitable system for multiproxy environmental reconstruction based on diatoms (including oxygen isotopes), chironomids and sediment-geochemical parameters.

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Spatial distribution of environmental indicators in surface sediments of Lake Bolshoe Toko, Yakutia, Russia

Biogeosciences ◽

10.5194/bg-16-4023-2019 ◽

2019 ◽

Vol 16 (20) ◽

pp. 4023-4049 ◽

Cited By ~ 3

Author(s):

Boris K. Biskaborn ◽

Larisa Nazarova ◽

Lyudmila A. Pestryakova ◽

Liudmila Syrykh ◽

Kim Funck ◽

...

Keyword(s):

Grain Size ◽

Oxygen Isotopes ◽

Water Depth ◽

Environmental Indicators ◽

Sediment Surface ◽

Series Data ◽

Lake Basin ◽

Mountain Range ◽

Organic Carbon Content ◽

Central Basin

Abstract. Rapidly changing climate in the Northern Hemisphere and associated socio-economic impacts require reliable understanding of lake systems as important freshwater resources and sensitive sentinels of environmental change. To better understand time-series data in lake sediment cores, it is necessary to gain information on within-lake spatial variabilities of environmental indicator data. Therefore, we retrieved a set of 38 samples from the sediment surface along spatial habitat gradients in the boreal, deep, and yet pristine Lake Bolshoe Toko in southern Yakutia, Russia. Our methods comprise laboratory analyses of the sediments for multiple proxy parameters, including diatom and chironomid taxonomy, oxygen isotopes from diatom silica, grain-size distributions, elemental compositions (XRF), organic carbon content, and mineralogy (XRD). We analysed the lake water for cations, anions, and isotopes. Our results show that the diatom assemblages are strongly influenced by water depth and dominated by planktonic species, i.e. Pliocaenicus bolshetokoensis. Species richness and diversity are higher in the northern part of the lake basin, associated with the availability of benthic, i.e. periphytic, niches in shallower waters. δ18Odiatom values are higher in the deeper south-western part of the lake, probably related to water temperature differences. The highest amount of the chironomid taxa underrepresented in the training set used for palaeoclimate inference was found close to the Utuk River and at southern littoral and profundal sites. Abiotic sediment components are not symmetrically distributed in the lake basin, but vary along restricted areas of differential environmental forcing. Grain size and organic matter are mainly controlled by both river input and water depth. Mineral (XRD) data distributions are influenced by the methamorphic lithology of the Stanovoy mountain range, while elements (XRF) are intermingled due to catchment and diagenetic differences. We conclude that the lake represents a valuable archive for multiproxy environmental reconstruction based on diatoms (including oxygen isotopes), chironomids, and sediment–geochemical parameters. Our analyses suggest multiple coring locations preferably at intermediate depth in the northern basin and the deep part in the central basin, to account for representative bioindicator distributions and higher temporal resolution, respectively.

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EFFECTIVENESS OF ENVIRONMENTAL TREATIES: TREND ANALYSIS OF TREATY-BASED ENVIRONMENTAL INDICATORS

Journal of Environmental Assessment Policy and Management ◽

10.1142/s1464333205002146 ◽

2005 ◽

Vol 07 (03) ◽

pp. 493-541 ◽

Cited By ~ 1

Author(s):

CHENAZ B. SEELARBOKUS

Keyword(s):

Environmental Conditions ◽

Environmental Changes ◽

Time Series Data ◽

International Environmental Agreements ◽

Environmental Indicators ◽

Series Data ◽

Regime Effectiveness ◽

Global Environmental ◽

Data Limitations ◽

Environmental Effectiveness

The literature on environmental regime effectiveness has shown a predilection for behaviour modification studies, whereby effectiveness is associated with a change in the behaviour of relevant actors. There has not been a systematic endeavour to link the implementation of international environmental agreements (IEAs) with improvement in environmental conditions. This article shifts away from the paradigm of behavioural analysis and focuses instead on linking IEA effectiveness with positive environmental changes in treaty-based environmental effectiveness indicators. Thirty-four treaty texts have been analysed to determine potential environmental indicators, and treaty secretariats have been contacted to collect time-series data on the selected indicators. Based on data gathered, trend lines are established for the environmental indicators to depict changes in related global environmental conditions. The results of this exercise show that viewing IEA effectiveness from the environmental modification perspective is promising, though there are serious data limitations still to be overcome.

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Retreat of the Rhine Glacier from Lake Constance: Sedimentological and geochemical evidences from a deep lake-basin drillhole

10.5194/egusphere-egu21-7098 ◽

2021 ◽

Author(s):

Sebastian Schaller ◽

Michael E. Boettcher ◽

Marius W. Buechi ◽

Laura S. Epp ◽

Stefano C. Fabbri ◽

...

Keyword(s):

Water Depth ◽

Environmental Changes ◽

Lacustrine Sediments ◽

Late Glacial ◽

Seismic Survey ◽

Lake Constance ◽

Lake Basin ◽

Channel System ◽

The Holocene ◽

The Alps

The modern basin of trinational Lake Constance, between Switzerland, Germany, and Austria, represents the underfilled northern part of a glacially overdeepened trough. It is over 400 m deep and reaches well into the Alps at its southern end. The overdeepening was formed by the numerous glacial advance-retreat cycles of the Rhine Glacier throughout the Middle to Late Quaternary. A seismic survey of Lake Constance revealed a Quaternary sediment fill of over 150 m thickness under the modern lake floor in a maximal water depth of >250 m. This sedimentary sequence represents at least the last glacial cycle with ice-contact deposits at the base on top of the Molasse bedrock overlain by glaciolacustrine to lacustrine sediments. During the successful field test of a newly developed mid-size coring system ("HIPERCORIG"), the longest core ever taken in Lake Constance was recovered with an overall length of 24 m. The drill core, taken in a water depth of 200 m, consists of a nearly continuous succession of lacustrine sediments including over 12 m of pre-Holocene sediment at the base. The entire core was petrophysically and geochemically analyzed, sedimentologically described, and 14 lithotypes were identified. In combination with a 14C- and OSL-based age-depth model, the core was divided into three main chronostratigraphic units. The basal age of ~13.7 ka BP places the base of the section back into the B&#248;lling-Aller&#248;d interstadial whereas the overlying strata represent a complete Younger-Dryas and Holocene section.The sediments offer a high-resolution insight into the evolution of Paleolake Constance from a cold postglacial to a more productive warm Holocene lake. The Late Glacial sections are dominated by massive, m-thick sand beds reflecting episodic sedimentation pulses. They are most likely linked with a subaquatic channel system that is still apparent in today's lake bathymetry despite the Holocene drape. This channel system was fed from a Late Glacial river from the north; provenance analysis of the initially unexpected sands together with hydrologic considerations will document whether this inflowing high-discharge river represented a local catchment (i.e. northern lake shore) or an Alpine signal (i.e. from the south) provided by the Rhine glacier. Tentative pore water hydrogeochemical and isotope analyses indicate a still active flow system at depth. The overlying Holocene section reveals a prominent, several cm-thick double-turbiditic event layer representing the most distal impact of the "Flimser Bergsturz", the largest known rock slide of the Alps that occurred over 100 km upstream the Rhine River at ~9.5 ka BP. Furthermore, lithologic variations in the Holocene section document the varying sediment load of the Rhine and of the endogenic production representing a multitude of environmental changes.

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Sedimentological and Biological Changes Associated with the Construction of the Oil Terminal of Antifer, France

Water Science & Technology ◽

10.2166/wst.1984.0071 ◽

1984 ◽

Vol 16 (3-4) ◽

pp. 399-406

Author(s):

Y Monbet

Keyword(s):

Grain Size ◽

Environmental Changes ◽

Biological Effects ◽

Standing Stock ◽

Natural Populations ◽

Benthic Fauna ◽

Field Investigations ◽

Mean Grain Size ◽

To Receive ◽

Principal Species

A study was conducted to gain insight on actual sedimentological and biological effects associated with the construction of an oil Terminal designed to receive 500 000 d.w.t. tankers. Field investigations and subsequent laboratory analyses were organized to evaluate the nature and magnitude of environmental changes on benthic macrofauna, three years after the end of the construction. Sediments were found to decrease dramatically in medium grain size in area sheltered by the newly built breakwater. Increase of percentage of silt and clays (90 % against 20 %) was observed leeward of the jetty. The benthic fauna showed significant modifications. Although the same community (Pectinaria kareni Abra alba) recolonized the bottom after the dredging of up to 30 × 106 m3 of sediments, increase in abundance occured. Biomass remained at a constant level and decrease of diversity was observed. Considering the rate of siltation, and assuming a constant siltation rate equal to the rate observed from 1975 to 1978, a simple regressive model relating biomass to mean grain size of sediments has been developped. This model allowed the prediction of biomass and production of the two principal species for the period 1978 – 1981. Continuous siltation within the harbor leads to a maximum of biomass from years after the end of the construction, followed by a decrease of standing stock. This process may be explained by the respective tolerance of the two principal species to increase silt contant and also probably by the accumulation of organic matter which may impede the development of natural populations.

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Deglaciation and postglacial environmental changes in the Teton Mountain Range recorded at Jenny Lake, Grand Teton National Park, WY

Quaternary Science Reviews ◽

10.1016/j.quascirev.2016.02.024 ◽

2016 ◽

Vol 138 ◽

pp. 62-75 ◽

Cited By ~ 13

Author(s):

Darren J. Larsen ◽

Matthew S. Finkenbinder ◽

Mark B. Abbott ◽

Adam R. Ofstun

Keyword(s):

National Park ◽

Environmental Changes ◽

Mountain Range ◽

Grand Teton National Park

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Examining the Driving Factors of the Direct Carbon Emissions of Households in the Ebinur Lake Basin Using the Extended STIRPAT Model

Sustainability ◽

10.3390/su13031339 ◽

2021 ◽

Vol 13 (3) ◽

pp. 1339

Author(s):

Ziyuan Chai ◽

Zibibula Simayi ◽

Zhihan Yang ◽

Shengtian Yang

Keyword(s):

Energy Consumption ◽

Carbon Emissions ◽

Carbon Emission ◽

Driving Factors ◽

Series Data ◽

Lake Basin ◽

Stirpat Model ◽

Consumption Structure ◽

Ebinur Lake ◽

Ebinur Lake Basin

In order to achieve the carbon emission reduction targets in Xinjiang, it has become a necessary condition to study the carbon emission of households in small and medium-sized cities in Xinjiang. This paper studies the direct carbon emissions of households (DCEH) in the Ebinur Lake Basin, and based on the extended STIRPAT model, using the 1987–2017 annual time series data of the Ebinur Lake Basin in Xinjiang to analyze the driving factors. The results indicate that DCEH in the Ebinur Lake Basin during the 31 years from 1987 to 2017 has generally increased and the energy structure of DCEH has undergone tremendous changes. The proportion of coal continues to decline, while the proportion of natural gas, gasoline and diesel is growing rapidly. The main positive driving factors affecting its carbon emissions are urbanization, vehicle ownership and GDP per capita, while the secondary driving factor is residents’ year-end savings. Population, carbon intensity and energy consumption structure have negative effects on carbon emissions, of which energy consumption structure is the main factor. In addition, there is an environmental Kuznets curve between DCEH and economic development, but it has not yet reached the inflection point.

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Socioeconomic coordinates of sustainable development

Moscow State University Bulletin Series 18 Sociology and Political Science ◽

10.24290/1029-3736-2019-25-3-156-172 ◽

2019 ◽

Vol 25 (3) ◽

pp. 156-172

Author(s):

V. P. Vasiliev

Keyword(s):

Sustainable Development ◽

Social Dynamics ◽

Environmental Changes ◽

Environmental Indicators ◽

International Standards ◽

Economic Research ◽

New Paradigm ◽

Socially Responsible ◽

Environment Analysis ◽

Public Companies

Sustainable development is revealed in the direction of a new paradigm of social dynamics analysis. The transformation of the thinking and actions of governments and businesses in the blathe state — the fight against poverty — the protection of the environment calls into question the well-known formula for economic growth. The article examines the shortcomings of GDP as an indicator of socio-economic dynamics. The system of international ratings and their indicators including along with economic parameters a number of socio-environmental indicators is shown. However, it is shown that the value of GDP is not exhausted for socio-economic research. New international coordinate system for sustainable development applied on the study of forms of strategic planning of Russia Studied the problem of instability of development of Russian business, among which shows the deformation of the labor market and outdated material-technical base. These problems are factors of negative social and environmental changes. Practice is characterized by public companies in the field of sustainable development, based on the principles of the Global compact and includes the use of international standards, covering activities in environment, analysis and adjust working practices, quality management, socially responsible business.

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Geochemistry of Surface Sediments From the Emperor Seamount Chain, North Pacific

Frontiers in Earth Science ◽

10.3389/feart.2021.674842 ◽

2021 ◽

Vol 9 ◽

Author(s):

Jie Chen ◽

Jianjun Zou ◽

Aimei Zhu ◽

Xuefa Shi ◽

Dirk Nürnberg ◽

...

Keyword(s):

Grain Size ◽

Rare Earth ◽

Rare Earth Elements ◽

Water Depth ◽

Surface Sediment ◽

North Pacific ◽

The North ◽

Seamount Chain ◽

The North Pacific ◽

Emperor Seamount Chain

Investigating the composition and distribution of pelagic marine sediments is fundamental in the field of marine sedimentology. The spatial distributions of surface sediment are unclear due to limited investigation along the Emperor Seamount Chain of the North Pacific. In this study, a suite of sedimentological and geochemical proxies were analyzed, including the sediment grain size, organic carbon, CaCO3, major and rare earth elements of 50 surface sediment samples from the Emperor Seamount Chain, spanning from ∼33°N to ∼52°N. On the basis of sedimentary components, we divide them into three Zones (I, II, and III) spatially with distinct features. Sediments in Zone I (∼33°N–44°N) and Zone III (49.8°N–53°N) are dominated by clayey silt, and mainly consist of sand and silty sand in Zone II. The mean grain size of the sortable silt shows that the hydrodynamic condition in the study area is significantly stronger than that of the abyssal plain, especially at the water depth of 1,000–2,500 m. The CaCO3 contents in sediments above 4,000 m range from 20 to 84% but decrease sharply to less than 1.5% below 4,000 m, confirming that the water depth of 4,000 m is the carbonate compensation depth of the study area. Strong positive correlations between Al2O3 and Fe2O3, TiO2, MgO, and K2O (R > 0.9) in the bulk sediments indicate pronounced contributions of terrigenous materials from surrounding continent mass to the study area. Furthermore, the eolian dust makes contributions to the composition of bulk sediments as confirmed by rare earth elements. There is no significant correlation between grain size and major and minor elements, which indicates that the sedimentary grain size does not exert important effects on terrigenous components. There is significant negative δCe and positive δEu anomalies at all stations. The negative Ce anomaly mainly exists in carbonate-rich sediments, inheriting the signal of seawater. The positive Eu anomaly indicates widespread volcanism contributions to the study area from active volcanic islands arcs around the North Pacific. The relative contributions of terrestrial, volcanic, and biogenic materials vary with latitude and water depth in the study area.

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