Radioactive isotopes such as ⁷Be, ²¹⁰Pb and ¹³⁷Cs are used as indicators of processes associated with the transfer of matter from the atmosphere. There are no widely known data on studies of the joint seasonal atmospheric flux of ⁷Be and ²¹⁰Pb_atm, based on the study of integrated snow samples accumulated in winter periods in territory of Western Siberia. Study of snow cover can provide information on the total flux of ⁷Be and ²¹⁰Pb to the Earth’s surface over the entire period of snow accumulation without separation of the dry or wet components. The purpose of this study is to conduct a comparative analysis of ⁷Be, ²¹⁰Pb and ¹³⁷Cs deposition as a part of the atmospheric precipitation in the Arctic and south regions of Western Siberia in winter period. As a result of the research, data on the joint deposition of ⁷Be, ²¹⁰Pb and ¹³⁷Cs in integral snow samples, including atmospheric precipitation, dust, and aerosols, in the Arctic (for 7 months) and southern (for 5 months) regions of Western Siberia were firstly obtained. A comparative analysis of the data shows that, despite the difference in geographic location, the concentration of ⁷Be in the snow water of the Arctic (248.0 mBq L^-1) and south (265.4 mBq L^-1) regions is almost equal. At the same time, the specific activity of ²¹⁰Pb in the suspended matter of snow waters sampled in the southern region is 1.6 times higher, which may indicate a much higher level of dust material intake in winter.

1. C. M. Alonso-Hernández, Y. Morera-Gómez, H. Cartas-Águila, A. Guillén-Arruebarrena, “Atmospheric deposition patterns of ²¹⁰Pb and ⁷Be in Cienfuegos, Cuba,” J. Environ. Radioact., vol. 138, pp. 149-155, Dec. 2014.
   DOI: 10.1016/j.jenvrad.2014.08.023
2. M. Baskaran, “Po-210 and Pb-210 as atmospheric tracers and global atmospheric Pb-210 fallout: A review,” J. Environ. Radioact., vol. 102, pp. 500-513, May 2011.
   DOI: 10.1016/j.jenvrad.2010.10.007
3. M. Baskaran, A. S. Naidu, “²¹⁰Pb-derived chronology and the fluxes of ²¹⁰Pb and ¹³⁷Cs isotopes into continental shelf sediments, East Chukchi Sea, Alaskan Arctic,” Geochim. Cosmochim. Acta, vol. 59, pp. 4435-4448, Nov. 1995.
   DOI: 10.1016/0016-7037(95)00248-X
4. M. Baskaran, G. E. Shaw, “Residence time of arctic haze aerosols using the concentrations and activity ratios of ²¹⁰Po, ²¹⁰Pb and ⁷Be,” J. Aerosol Sci., vol. 32, pp. 443-452, Apr. 2001.
   DOI: 10.1016/S0021-8502(00)00093-8
5. S. Caillet, P. Arpagaus, F. Monna, J. Dominik, “Factors controlling ⁷Be and ²¹⁰Pb atmospheric deposition as revealed by sampling individual rain events in the region of Geneva, Switzerland,” J. Environ. Radioact., vol. 53, pp. 241-256, Mar. 2001.
   DOI: 10.1016/S0265-931X(00)00130-2
6. J. Carroll, M. Williamson, I. Lerche, E. Karabanov, D. F. Williams, “Geochronology of Lake Baikal from ²¹⁰Pb and ¹³⁷Cs radioisotopes,” Appl. Radiat. Isot., vol. 50, pp. 1105-1119, Jun. 1999.
   DOI: 10.1016/S0969-8043(98)00116-X
7. J. M. Godoy et al., “¹³⁷Cs, ^{226, 228}Ra, ²¹⁰Pb and ⁴⁰K concentrations in Antarctic soil, sediment and selected moss and lichen samples,” J. Environ. Radioact., vol. 41, pp. 33-45, Oct. 1998.
   DOI: 10.1016/S0265-931X(97)00084-2
8. S. V. Hansson, J. M. Kaste, K. Chen, R. Bindler, “Beryllium-7 as a natural tracer for short-term downwash in peat,” Biogeochemistry, vol. 119, pp. 329-339, Mar. 2014.
   DOI: 10.1007/s10533-014-9969-y
9. A. -P. Leppänen, I. G. Usoskin, G. A. Kovaltsov, J. Paatero, “Cosmogenic ⁷Be and ²²Na in Finland: Production, observed periodicities and the connection to climatic phenomena,” J. Atmos. Sol.-Terr. Phys., vol. 74, pp. 164-180, Jan. 2012.
   DOI: 10.1016/j.jastp.2011.10.017
10. J. Simon, J. Meresova, I. Sykora, M. Jeskovsky, K. Holy, “Modeling of temporal variations of vertical concentration profile of ⁷Be in the atmosphere,” Atmos. Environ., vol. 43, pp. 2000-2004, Apr. 2009.
    DOI: 10.1016/j.atmosenv.2009.01.015
11. A. Taylor, W. H. Blake, H. G. Smith, L. Mabit, M. J. Keith-Roach, “Assumptions and challenges in the use of fallout beryllium-7 as a soil and sediment tracer in river basins,” Earth-Sci. Rev., vol. 126, pp. 85-95, Nov. 2013.
    DOI: 10.1016/j.earscirev.2013.08.002
12. Y. Y. Yoon, С. K. Dong, Y. L. Kil, Y. C. Soo, “Seasonal variation of⁷Be and ³H in Korean ambient air and rain,” J. Radioanal. Nucl. Chem., vol. 307, pp. 1629-1633, 2016.
    DOI: 10.1007/s10967-015-4340-x
13. A. Aba, A. M. Al-Dousari, A. Ismaeel, “Depositional characteristics of ⁷Be and ²¹⁰Pb in Kuwaiti dust,” J. Radioanal. Nucl. Chem ., vol. 307, pp. 15-23, 2016.
    DOI: 10.1007/s10967-015-4129-y
14. M. Baskaran, “A search for the seasonal variability on the depositional fluxes of ⁷Be and ²¹⁰Pb,” J. Geophys. Res. Atmos., vol. 100, pp. 2833-2840, Feb. 1995.
    DOI: 10.1029/94JD02824
15. M. Baskaran, C. H. Coleman, P. H. Santschi, “Atmospheric depositional fluxes of ⁷Be and ²¹⁰Pb at Galveston and College Station, Texas,” J. Geophys. Res. Atmos., vol. 98, pp. 20555-20571, Nov. 1993.
    DOI: 10.1029/93JD02182
16. E. A. Buraeva, M. G. Davydov, L. V. Zorina, V. S. Malyshevskii, V. V. Stasov, “Content of cosmogenic ⁷Be in the air layer at the ground at temperate latitudes,” At. Energy, vol. 102, pp. 463-468, 2007.
    DOI: 10.1007/s10512-007-0073-4
17. M. Melgunov et al., “Radioactive elements in atmospheric precipitations of the Western Siberia,” E3S Web Conf., vol. 98, pp. 10003, 2019.
    DOI: 10.1051/e3sconf/20199810003
18. K. Mezina, M. Melgunov, D. Belyanin, “⁷Be, ²¹⁰Pb _atm and ¹³⁷Cs in Snow Deposits in the Arctic Part of Western Siberia (Yamal-Nenets Autonomous District),” Atmosphere, vol. 11, pp. 825, 2020.
    DOI: 10.3390/atmos11080825
19. M. Pöschl, T. Brunclík, J. Hanák, “Seasonal and inter-annual variation of Beryllium-7 deposition in birch-tree leaves and grass in the northeast upland area of the Czech Republic,” J. Environ. Radioact., vol. 101, pp. 744-750, Sep. 2010.
    DOI: 10.1016/j.jenvrad.2010.05.001
20. A. Taylor, M. J. Keith-Roach, A. R. Iurian, L. Mabit, W. H. Blake, “Temporal variability of beryllium-7 fallout in southwest UK ,” J. Environ. Radioact., vol. 160, pp. 80-86, Aug. 2016.
    DOI: 10.1016/j.jenvrad.2016.04.025
21. D. Lal, P. K. Malhotra, B. Peters, “On the production of radioisotopes in the atmosphere by cosmic radiation and their application to meteorology ,” J. Atmos. Terr. Phys., vol. 12, pp. 306-328, Jul. 1958.
    DOI: 10.1016/0021-9169(58)90062-X
22. B. L. Shcherbov, The role of forest floor in migration of metals and artificial nuclides during forest fires in Siberia,” Contemp. Probl. Ecol., vol. 5, pp. 191-199, 2012.
    DOI: 10.1134/S1995425512020114
23. Б. Л. Щербов, Е. В. Лазарева, И. С. Журкова, «Лесные пожары и их последствия», 1-е изд., Академическое издательство «Гео»: Новосибирск, Россия, стр. 38-112, 2015. (B. L. Shcherbov, E. V. Lazareva, I. S. Zhurkova, “Forest fires and their consequences,” 1st ed., Academic publishing house «Geo»: Novosibirsk, Russia, pp. 38-112, 2015.)
24. A. Ioannidou, “Activity size distribution of ⁷Be in association with trace metals in the urban area of the city of Thessaloniki, Greece ,” Atmos. Environ., vol. 45, pp. 1286-1290, Feb. 2011.
    DOI: 10.1016/j.atmosenv.2010.12.006
25. J. E. Dibb, “Beryllium-7 and Lead-210 in the atmosphere and surface snow over the Greenland ice sheet in the summer of 1989,” J. Geophys. Res., vol. 95, pp. 22407, 1990.
    DOI: 10.1029/jd095id13p22407
26. J. E. Dibb, J. -L. Jaffrezo, “Beryllium-7 and lead-210 in aerosol and snow in the dye 3 gas, aerosol and snow sampling program,” Atmos. Environ. Part A. Gen. Top., vol. 27, pp. 2751–2760, Dec. 1993.
    DOI: 10.1016/0960-1686(93)90307-k
27. C. I. Davidson et al., “Chemical constituents in the air and snow at Dye 3, Greenland—I. Seasonal variations,” Atmos. Environ. Part A. Gen. Top., vol. 27, pp. 2709–2722, Dec. 1993.
    DOI: 10.1016/0960-1686(93)90304-h
28. J. S. Gaffney, K. A. Orlandini, N. A. Marley, “Measurements of ⁷ Be and ²¹⁰Pb in Rain, Snow, and Hail,” J. Appl. Meteorol., vol. 33, pp. 869-873, 1994.
    DOI: 10.1175/1520-0450(1994)033<0869:MOAIRS>2.0.CO;2
29. A. A. Renfro, J. K. Cochran, B. A. Colle, “Atmospheric fluxes of ⁷Be and ²¹⁰Pb on monthly time-scales and during rainfall events at Stony Brook, New York (USA),” J. Environ. Radioact., vol. 116, pp. 114-123, Feb. 2013.
    DOI: 10.1016/j.jenvrad.2012.09.007
30. V. M. Gavshin et al., “Disequilibrium between uranium and its progeny in the Lake Issyk-Kul system (Kyrgyzstan) under a combined effect of natural and manmade processes,” J. Environ. Radioact., vol. 83, pp. 61-74, 2005.
    DOI: 10.1016/j.jenvrad.2005.02.012
31. M. S. Mel’gunov et al., “Anomalies of radioactivity on the southern bank of the Ysyk-Köl Lake (Kyrgyzstan),” Chem. Sustain. Dev., vol. 11, pp. 859–870, 2003.
    DOI: 10.1029/2002JD003021

Kseniya Mezina, Mikhail Melgunov, Dmitriy Belyanin, "⁷Be, ²¹⁰Pb and ¹³⁷Cs in atmospheric deposition of southern and arctic regions of western Siberia," RAD Conf. Proc, vol. 4, 2020, pp. 161–166, http://doi.org/10.21175/RadProc.2020.33