TY - JOUR

T1 - 7Be, 210Pbatm and 137Cs in snow deposits in the arctic part of Western Siberia (Yamal-nenets autonomous district)

AU - Mezina, Kseniya

AU - Melgunov, Mikhail

AU - Belyanin, Dmitriy

N1 - Publisher Copyright: © 2020 by the authors. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/8/5

Y1 - 2020/8/5

N2 - Radioactive isotopes (7Be, 210Pbatm and 137Cs) are used as indicators of processes associated with the transfer of matter from the atmosphere. Studying snow cover can provide information about the seasonal deposition flux of the isotopes to the Earth's surface over the entire period of snow accumulation. The purpose of this study is to identify the features of 7Be, 210Pbatm and 137Cs deposition with the atmospheric precipitation in winter in the Arctic part of Western Siberia and to study the contribution of the particulate fractions of suspended matter in snow water to the total content of the radionuclides in samples of integrated seasonal snowfall. Snow samples were taken over a wide area along the highways around Novy Urengoy in April 2019. The suspended matter in snow samples was divided into three fractions. The isotopic composition was determined by high-resolution semiconductor gamma-spectrometry. The seasonal deposition flux of 7Be and 210Pbatm in the winter at the time of sampling averaged 58.7 and 25.2 Bq m-2 season-1, respectively. The average specific activity of 7Be and 210Pbatm in the snow water was 248.0 and 104.5 mBq L-1. The deposition flux of 137Cs from the atmosphere was low compared to 7Be and 210Pbatm and did not exceed 0.39 Bq m-2 season-1 at all sampling points. This indicates an insignificant modern flux of the radionuclide from the atmosphere. The separation of suspended matter in snow water by particulate fractions shows that the studied isotopes are present in all the extracted fractions: >3, 0.45-3 and <0.45 μm. The main part of 210Pbatm in all studied samples is in the coarse-grained fraction >3 μm. Most 7Be is contained in finely dispersed aerosols, colloids, or a dissolved component (where the fraction <0.45 μm). A significant increase in the contribution of coarse-grained fractions of suspended matter in snow water to the total activity of 7Be in snow precipitation was observed in territories with a higher anthropogenic impact.

AB - Radioactive isotopes (7Be, 210Pbatm and 137Cs) are used as indicators of processes associated with the transfer of matter from the atmosphere. Studying snow cover can provide information about the seasonal deposition flux of the isotopes to the Earth's surface over the entire period of snow accumulation. The purpose of this study is to identify the features of 7Be, 210Pbatm and 137Cs deposition with the atmospheric precipitation in winter in the Arctic part of Western Siberia and to study the contribution of the particulate fractions of suspended matter in snow water to the total content of the radionuclides in samples of integrated seasonal snowfall. Snow samples were taken over a wide area along the highways around Novy Urengoy in April 2019. The suspended matter in snow samples was divided into three fractions. The isotopic composition was determined by high-resolution semiconductor gamma-spectrometry. The seasonal deposition flux of 7Be and 210Pbatm in the winter at the time of sampling averaged 58.7 and 25.2 Bq m-2 season-1, respectively. The average specific activity of 7Be and 210Pbatm in the snow water was 248.0 and 104.5 mBq L-1. The deposition flux of 137Cs from the atmosphere was low compared to 7Be and 210Pbatm and did not exceed 0.39 Bq m-2 season-1 at all sampling points. This indicates an insignificant modern flux of the radionuclide from the atmosphere. The separation of suspended matter in snow water by particulate fractions shows that the studied isotopes are present in all the extracted fractions: >3, 0.45-3 and <0.45 μm. The main part of 210Pbatm in all studied samples is in the coarse-grained fraction >3 μm. Most 7Be is contained in finely dispersed aerosols, colloids, or a dissolved component (where the fraction <0.45 μm). A significant increase in the contribution of coarse-grained fractions of suspended matter in snow water to the total activity of 7Be in snow precipitation was observed in territories with a higher anthropogenic impact.

KW - Cs

KW - Pb

KW - Be

KW - Arctic

KW - Atmosphere

KW - Precipitation

KW - Snow

KW - atmosphere

KW - TEMPORAL VARIABILITY

KW - CS-137

KW - Cs-137

KW - COSMOGENIC BE-7

KW - AIR

KW - TIME

KW - PB-210

KW - BERYLLIUM-7

KW - precipitation

KW - Be-7

KW - Pb-210(atm)

KW - snow

KW - ATMOSPHERIC DEPOSITION

KW - SOIL

KW - FLUXES

UR - http://www.scopus.com/inward/record.url?scp=85089874544&partnerID=8YFLogxK

U2 - 10.3390/ATMOS11080825

DO - 10.3390/ATMOS11080825

M3 - Article

AN - SCOPUS:85089874544

VL - 11

JO - Atmosphere

JF - Atmosphere

SN - 2073-4433

IS - 8

M1 - 825

ER -