TY - JOUR

T1 - ОСОБЕННОСТИ ФОРМИРОВАНИЯ КАЧЕСТВЕННЫХ ХАРАКТЕРИСТИК ВОД И НАНОСОВ В ДЕЛЬТЕ РЕКИ ЛЕНЫ

AU - Chetverova, A. A.

AU - Fedorova, I. V.

AU - Frolova, L. A.

AU - Nigamatzyanova, G. R.

AU - Skorospekhova, T. V.

AU - Shadrina, A. A.

N1 - Funding Information: Keywords: Lena River delta, hydrology, hydrochemistry, geochemistry of river sediments, hydrobiology, zooplankton Acknowledgments. The study was supported by the Russian Foundation for basic Research (projects nos. 15-35-50566 mol_nr, 15-05-04442 A, and 14-05-00787 A), as well as by the program for increasing the competitiveness of Kazan Federal University and the “Campaign 6” of St. Petersburg State University. Publisher Copyright: © 2017 Kazan Federal University. All rights reserved.

PY - 2017

Y1 - 2017

N2 - The paper considers the qualitative characteristics (chemical composition of waters and sediments, biological diversity) of the Lena runoff and their transformation as a result of the biogeochemical processes taking place in the delta region. The hydrological, hydrochemical, geochemical (chemical composition of river sediments), and hydrobiological description of the delta branches at the current stage has been provided. The Lena delta branches are characterized by a wide variety of water discharge values and hydrodynamic conditions. It has been revealed that the hydrochemical composition of the delta is specific due to the dominance of hydrocarbonates and calcium ions, pH 6.9-7.9, high oxygen saturation conditions (more than 100 % sat.) throughout the water column because of wind activity, high concentrations of dissolved silica (1.1-2.7 mg/L) and iron (0.01-0.07 mg/L) if compared to the world's mean values in natural freshwater bodies, and low concentrations of trace elements (mainly below the detection limits). The concentrations of nitrates and phosphates have been estimated in the range of 2.6-34.7 µg/L and 3.1-26.2 µg/L, respectively. The bottom and suspended sediments have been assigned to the siliceous type (Si/Al varies from 4.2 to 18 µg/L). The results of the analysis of hydrodynamic conditions, hydrobiological features, geochemical indices, as well as data of the statistical factor analysis, have shown chemical elements redistribution dependencies. Several factors determining the chemical composition of water and sediments in the Lena River delta have been distinguished. The interpretation of these factors reflects the influence of river catchment area, cryogenic processes in the river delta, and biogeochemical processes. Based on the modern multidisciplinary research performed in the Lena delta, it has been demonstrated that processes leading to an inhomogeneous distribution of chemical elements between water (dissolved fraction), suspended matter, and bottom sediments occur in the delta of the river.

AB - The paper considers the qualitative characteristics (chemical composition of waters and sediments, biological diversity) of the Lena runoff and their transformation as a result of the biogeochemical processes taking place in the delta region. The hydrological, hydrochemical, geochemical (chemical composition of river sediments), and hydrobiological description of the delta branches at the current stage has been provided. The Lena delta branches are characterized by a wide variety of water discharge values and hydrodynamic conditions. It has been revealed that the hydrochemical composition of the delta is specific due to the dominance of hydrocarbonates and calcium ions, pH 6.9-7.9, high oxygen saturation conditions (more than 100 % sat.) throughout the water column because of wind activity, high concentrations of dissolved silica (1.1-2.7 mg/L) and iron (0.01-0.07 mg/L) if compared to the world's mean values in natural freshwater bodies, and low concentrations of trace elements (mainly below the detection limits). The concentrations of nitrates and phosphates have been estimated in the range of 2.6-34.7 µg/L and 3.1-26.2 µg/L, respectively. The bottom and suspended sediments have been assigned to the siliceous type (Si/Al varies from 4.2 to 18 µg/L). The results of the analysis of hydrodynamic conditions, hydrobiological features, geochemical indices, as well as data of the statistical factor analysis, have shown chemical elements redistribution dependencies. Several factors determining the chemical composition of water and sediments in the Lena River delta have been distinguished. The interpretation of these factors reflects the influence of river catchment area, cryogenic processes in the river delta, and biogeochemical processes. Based on the modern multidisciplinary research performed in the Lena delta, it has been demonstrated that processes leading to an inhomogeneous distribution of chemical elements between water (dissolved fraction), suspended matter, and bottom sediments occur in the delta of the river.

KW - Geochemistry of river sediments

KW - Hydro-biology

KW - Hydrochemistry

KW - Hydrology

KW - Lena River delta

KW - Zooplankton

UR - http://www.scopus.com/inward/record.url?scp=85063100763&partnerID=8YFLogxK

M3 - статья

AN - SCOPUS:85063100763

VL - 159

SP - 122

EP - 138

JO - УЧЕНЫЕ ЗАПИСКИ КАЗАНСКОГО ГОСУДАРСТВЕННОГО УНИВЕРСИТЕТА. СЕРИЯ: ЕСТЕСТВЕННЫЕ НАУКИ

JF - УЧЕНЫЕ ЗАПИСКИ КАЗАНСКОГО ГОСУДАРСТВЕННОГО УНИВЕРСИТЕТА. СЕРИЯ: ЕСТЕСТВЕННЫЕ НАУКИ

SN - 2542-064X

IS - 1

ER -