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31 results on '"Demina, Liudmila L."'

1. Conclusions

Author

Demina, Liudmila L., Lisitsyn, Alexander P., Barceló, Damià, Editor-in-Chief, Kostianoy, Andrey G., Editor-in-Chief, Hutzinger, Otto, Founding Editor, Lisitsyn, Alexander P., editor, and Demina, Liudmila L., editor

Published
2018
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2. Introduction

Author

Lisitsyn, Alexander P., Demina, Liudmila L., Barceló, Damià, Editor-in-Chief, Kostianoy, Andrey G., Editor-in-Chief, Hutzinger, Otto, Founding Editor, Lisitsyn, Alexander P., editor, and Demina, Liudmila L., editor

Published
2018
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5. Trace Elements in Total Plankton of the White Sea

Author

Demina, Liudmila L., Leonova, Galina A., Bobrov, Vladislav A., Barceló, Damià, Editor-in-Chief, Kostianoy, Andrey G., Editor-in-Chief, Hutzinger, Otto, Founding Editor, Lisitsyn, Alexander P., editor, and Gordeev, Viacheslav V., editor

Published
2018
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7. Conclusions

Author

Demina, Liudmila L., Galkin, Sergey V., Barceló, Damià, Editor-in-chief, Kostianoy, Andrey G., Editor-in-chief, Demina, Liudmila L., editor, and Galkin, Sergey V., editor

Published
2016
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8. Introduction

Author

Galkin, Sergey V., Demina, Liudmila L., Barceló, Damià, Editor-in-chief, Kostianoy, Andrey G., Editor-in-chief, Demina, Liudmila L., editor, and Galkin, Sergey V., editor

Published
2016
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17. Postglacial sedimentation in the White Sea (northwestern Russia) reconstructed by integrated microfossil and geochemical data.

Author

Budko, Dmitry F., Demina, Liudmila L., Novichkova, Ekaterina A., Polyakova, Yelena I., Kravchishina, Marina D., and Melenevsky, Vasily N.

Subjects
*SEDIMENTATION & deposition, *FOSSIL microorganisms, *HOLOCENE Epoch, *MORPHOLOGY, *SEAS, *WATER temperature
Abstract

The White Sea being connected with the Arctic Ocean via the Barents Sea has an influence on its water temperature/salinity structures and biological processes and thus has an indirect impact on the Eurasian climate system. In this work, we have managed to find a correspondence between the climate fluctuation in the Holocene and changes in the geochemical and microfossil properties in the sediment core of the White Sea. For the first time, the element speciation in the sediment core covering about 10,000 cal yr BP period was investigated. The cooling periods (the early Holocene and the Subboreal stage) were characterized by a trend of increase in Si, Al, and Ti contents and Ti/Al ratios, which reflect lithogenous contribution, and decrease in geochemically labile forms of trace elements. A significant increase in the content of organic-bound trace elements and biogenic components (Сorg, BSi, and chlorin) was observed during periods of Holocene climatic optimums. The evident relationship between the metal speciation and indicators of the sedimentation paleoenvironment is observed at the stage of the active phase of early diagenesis after the slowing down of the biogeochemical processes. Down-core decrease in the Mn oxyhydroxide content exhibited a weakening of diagenesis processes at the ~130–150 cm depth. [ABSTRACT FROM AUTHOR]

Published
2020
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18. Geochemical Signatures of Paleoclimate Changes in the Sediment Cores from the Gloria and Snorri Drifts (Northwest Atlantic) over the Holocene-Mid Pleistocene.

Author

Demina, Liudmila L., Novichkova, Ekaterina A., Lisitzin, Alexander P., and Kozina, Nina V.

Subjects
*PALEOCLIMATOLOGY, *GLACIATION, *GLACIAL drift, *SEDIMENTS, *INTERGLACIALS, *SEDIMENTATION & deposition
Abstract

A multiproxy study of the sediment cores taken from the Snorri Drift, formed under the influence of the Iceland–Scotland bottom contour current, and from the Gloria Drift, located southward Greenland at the boundary of Irminger and Labrador Seas, was performed. This area undergoes a variable mixing of polar waters with the warm North Atlantic current, whose intensity and direction seemed to change dramatically with the alteration of warming and cooling periods during the six marine isotope stages MIS 1-6. The relative age of this core does not exceed 190,000 cal yr BP; the average sedimentation rate was 1.94 and 2.45 cm/kyr in the Gloria and Snorri Drifts core respectively. In both the cores, the sediment records showed the downcore co-variation of ice-rafted debris (IRD); and terrigenous elements, such as Si, Al, Ti, Cr, and Zr, were revealed; their values were clearly higher in the glacial periods (MIS 2, 4, and 6) compared to interglacials (MIS 1, 3, and 5). The downcore rhythmic distributions of these elements, as well as Al/Si, Ti/Al, Fe/Al ratios exhibit an opposite trend with that of δ18O values, biogenic components (CaCO3, BioSiO2), and Si/Fe and Mn/Fe ratios. [ABSTRACT FROM AUTHOR]

Published
2019
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