Балтийский федеральный университет им. Иммануила Канта
Калининградская область, Россия
Балтийский федеральный университет им. Иммануила Канта
Россия
УДК 55 Геология. Геологические и геофизические науки
УДК 550.34 Сейсмология
УДК 550.383 Главное магнитное поле Земли
ГРНТИ 39.19 Физическая география
ГРНТИ 37.01 Общие вопросы геофизики
ГРНТИ 37.15 Геомагнетизм и высокие слои атмосферы
ГРНТИ 37.25 Океанология
ГРНТИ 37.31 Физика Земли
ГРНТИ 38.01 Общие вопросы геологии
ГРНТИ 36.00 ГЕОДЕЗИЯ. КАРТОГРАФИЯ
ГРНТИ 37.00 ГЕОФИЗИКА
ГРНТИ 38.00 ГЕОЛОГИЯ
ГРНТИ 39.00 ГЕОГРАФИЯ
ГРНТИ 52.00 ГОРНОЕ ДЕЛО
ОКСО 05.00.00 Науки о Земле
ББК 26 Науки о Земле
ТБК 63 Науки о Земле. Экология
BISAC SCI SCIENCE
The study of the vertical distribution of methane dissolved in water and related parameters (water temperature and salinity, dissolved oxygen concentration) was carried out in 2021–2023 at the offshore carbon supersite Rosyanka in the Gdansk Deep of the Baltic Sea. Measurements with such frequency (a total of 16 surveys) were carried out in the region for the first time. Methane concentrations varied over a fairly wide range (0.000–1.122 μmol/L), and increased with depth, which is a typical distribution for the Baltic Sea and is associated with the vertical stratification of the water column. Single maximum values were characteristic of the layer extending from the bottom to the upper boundary of the halocline, which indicates the flow of methane from bottom sediments into the water column. In the near-surface layer (5–15 m), a weakly pronounced peak in methane concentrations was observed, which is a manifestation of the “oceanic methane paradox”. No pronounced seasonality was detected in the vertical distribution of dissolved methane; the correlation between temperature, salinity, oxygen, and methane content turned out to be low.
dissolved methane, carbon supersite, thermohaline conditions, hypoxia
1. Abrahamsson, K., E. Damm, G. Björk, et al. (2024), Methane plume detection after the 2022 Nord Stream pipeline explosion in the Baltic Sea, Scientific Reports, 14(1), https://doi.org/10.1038/s41598-024-63449-2.; ; EDN: https://elibrary.ru/LHCIQD
2. Axell, L. B. (1998), On the variability of Baltic Sea deepwater mixing, Journal of Geophysical Research: Oceans, 103(C10), 21,667–21,682, https://doi.org/10.1029/98JC01714.
3. Bange, H. W., U. H. Bartell, S. Rapsomanikis, and M. O. Andreae (1994), Methane in the Baltic and North Seas and a reassessment of the marine emissions of methane, Global Biogeochemical Cycles, 8(4), 465–480, https://doi.org/10.102 9/94GB02181.; DOI: https://doi.org/10.1029/94GB02181; EDN: https://elibrary.ru/XXSNER
4. Bange, H. W., K. Bergmann, H. P. Hansen, et al. (2010), Dissolved methane during hypoxic events at the Boknis Eck time series station (Eckernförde Bay, SW Baltic Sea), Biogeosciences, 7(4), 1279–1284, https://doi.org/10.5194/bg-7-1279-2010.
5. Bashirova, L., V. Sivkov, M. Ulyanova, A. Gavrikov, and A. Artamonov (2023), Climate and environmental monitoring of the Baltic Sea: general principles and approaches, Reliability: Theory & Applications. Special Issue, 5(75), 164–171, https://doi.org/10.24412/1932-2321-2023-575-164-171.
6. Berndmeyer, C., V. Thiel, O. Schmale, and M. Blumenberg (2013), Biomarkers for aerobic methanotrophy in the water column of the stratified Gotland Deep (Baltic Sea), Organic Geochemistry, 55, 103–111, https://doi.org/10.1016/j.orggeochem.2012.11.010.; ; EDN: https://elibrary.ru/RMDHQT
7. Bernikova, T. A., V. F. Dubravin, H. N. Nagornova, and Z. I. Stont (2007), Climatic seasons of the Southern Baltic Sea, in V International Scientific Conference "Innovations in Science and Education - 2007". Part 1, pp. 53–55, KSTU, Kaliningrad (in Russian).
8. Bolshakov, A. M., and A. V. Egorov (1987), On the use of the phase-equilibrium degassing technique in gasometric studies, Oceanology, 27(5), 861–862 (in Russian).
9. Brodecka, A., P. Majewski, J. Bolałek, and Z. Klusek (2013), Geochemical and acoustic evidence for the occurrence of methane in sediments of the Polish sector of the southern Baltic Sea, Oceanologia, 55(4), 951–978, https://doi.org/10.5697/oc.55-4.951.; ; EDN: https://elibrary.ru/SPXSWX
10. Bukanova, T. V., Z. I. Stont, and O. A. Gushchin (2015), Variability of sea surface temperature in the South-East Baltic according to MODIS data, Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 12(4), 86–96 (in Russian), EDN: https://elibrary.ru/UITZRP.;
11. Bukanova, T. V., E. S. Bubnova, and S. V. Aleksandrov (2022), Remote monitoring of the offshore site of the Rosyanka carbon polygon (the Baltic Sea): First results, Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 19(6), 234–247, https://doi.org/10.21046/2070-7401-2022-19-6-234-247 (in Russian).; ; EDN: https://elibrary.ru/KVBQWQ
12. Cicerone, R. J., and R. S. Oremland (1988), Biogeochemical aspects of atmospheric methane, Global Biogeochemical Cycles, 2(4), 299–327, https://doi.org/10.1029/GB002i004p00299.; ; EDN: https://elibrary.ru/XUZPIL
13. Conrad, R., and W. Seiler (1988), Methane and hydrogen in seawater (Atlantic Ocean), Deep Sea Research Part A. Oceanographic Research Papers, 35(12), 1903–1917, https://doi.org/10.1016/0198-0149(88)90116-1
14. Damm, E., E. Helmke, S. Thoms, et al. (2010), Methane production in aerobic oligotrophic surface water in the central Arctic Ocean, Biogeosciences, 7(3), 1099–1108, https://doi.org/10.5194/bg-7-1099-2010.; ; EDN: https://elibrary.ru/PISZAN
15. Donis, D., S. Flury, A. Stöckli, et al. (2017), Full-scale evaluation of methane production under oxic conditions in a mesotrophic lake, Nature Communications, 8(1), https://doi.org/10.1038/s41467-017-01648-4.; ; EDN: https://elibrary.ru/YIOZFJ
16. Elken, J. (1996), Deep water overflow, circulation and vertical exchange in the Baltic Proper, 91 pp., Estonian Mar. Inst., Tallinn.
17. Emelyanov, E. M. (Ed.) (2002), Geology of the Gdansk Basin. Baltic Sea, 496 pp., Yantarny skaz, Kaliningrad (in Russian).
18. Galchenko, V. F. (2001), Methanotrophic bacteria, 500 pp., GEOS, Moscow (in Russian).
19. Gentz, T., E. Damm, J. Schneider von Deimling, et al. (2014), A water column study of methane around gas flares located at the West Spitsbergen continental margin, Continental Shelf Research, 72, 107–118, https://doi.org/10.1016/j.csr.2013.07.013.; ; EDN: https://elibrary.ru/SOSJAZ
20. Geodekyan, A. A., V. Y. Trotsyuk, V. I. Avilov, et al. (1989), New data on the methane content in modern sediments of the Baltic Sea, Reports of the USSR Academy of Sciences, 250(1), 160–164 (in Russian).
21. Geodekyan, A. A., V. Y. Trotsyuk, and A. I. Blazhchishin (1990), Geoacoustic and gas lithogeochemical studies in the Baltic Sea. Geological features of fluid flow discharge areas, 164 pp., IO AN USSR, Moscow (in Russian).
22. Gindorf, S., H. W. Bange, D. Booge, and A. Kock (2022), Seasonal study of the small-scale variability in dissolved methane in the western Kiel Bight (Baltic Sea) during the European heatwave in 2018, Biogeosciences, 19(20), 4993–5006, https://doi.org/10.5194/bg-19-4993-2022.; ; EDN: https://elibrary.ru/DGKOKL
23. Grossart, H.-P., K. Frindte, C. Dziallas, W. Eckert, and K. W. Tang (2011), Microbial methane production in oxygenated water column of an oligotrophic lake, Proceedings of the National Academy of Sciences, 108(49), 19,657–19,661, https://doi.org/10.1073/pnas.1110716108
24. Gülzow, W., G. Rehder, J. Schneider von Deimling, T. Seifert, and Z. Tóth (2013), One year of continuous measurements constraining methane emissions from the Baltic Sea to the atmosphere using a ship of opportunity, Biogeosciences, 10(1), 81–99, https://doi.org/10.5194/bg-10-81-2013.; ; EDN: https://elibrary.ru/RJTQSF
25. Heilig, G. K. (1994), The greenhouse gas methane (CH4): Sources and sinks, the impact of population growth, possible interventions, Population and Environment, 16, 109–137.; DOI: https://doi.org/10.1007/BF02208779; EDN: https://elibrary.ru/XQSYLL
26. IPCC (2023), Climate Change 2023: Synthesis Report. Contribution of Working Groups I, II and III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, 184 pp., IPCC, Geneva, Switzerland, https://doi.org/10.59327/IPCC/AR6-9789291691647.
27. Jakobs, G., P. Holtermann, C. Berndmeyer, et al. (2014), Seasonal and spatial methane dynamics in the water column of the central Baltic Sea (Gotland Sea), Continental Shelf Research, 91, 12–25, https://doi.org/10.1016/j.csr.2014.07.005.; ; EDN: https://elibrary.ru/UQZRHT
28. Jaśniewicz, D., Z. Klusek, A. Brodecka-Goluch, and J. Bolałek (2018), Acoustic investigations of shallow gas in the southern Baltic Sea (Polish Exclusive Economic Zone): a review, Geo-Marine Letters, 39(1), 1–17, https://doi.org/10.1007/s00367-018-0555-5.; ; EDN: https://elibrary.ru/RCZQTT
29. Kanapatskiy, T. A., M. O. Ulyanova, T. R. Iasakov, O. V. Shubenkova, and N. V. Pimenov (2022), Microbial Processes of Carbon and Sulfur Cycles in Sediments of the Russian Sector of the Baltic Sea, in The Handbook of Environmental Chemistry, Springer Berlin Heidelberg, https://doi.org/10.1007/698_2021_818.
30. Karl, D. M., L. Beversdorf, K. M. Björkman, et al. (2008), Aerobic production of methane in the sea, Nature Geoscience, 1(7), 473–478, https://doi.org/10.1038/ngeo234; ; EDN: https://elibrary.ru/MENDVL
31. Kirschke, S., P. Bousquet, P. Ciais, et al. (2013), Three decades of global methane sources and sinks, Nature Geoscience, 6(10), 813–823, https://doi.org/10.1038/ngeo1955.; ; EDN: https://elibrary.ru/RIGTQN
32. Kladchenko, E. S., E. S. Chelebieva, M. S. Podolskaya, et al. (2024), Shift in hemocyte immune parameters of marine bivalve Mytilus galloprovincialis (Lamarck, 1819) after exposure to methane, Marine Pollution Bulletin, 201, 116,174, https://doi.org/10.1016/j.marpolbul.2024.116174.; ; EDN: https://elibrary.ru/FNCQFT
33. Klintzsch, T., H. Geisinger, A. Wieland, et al. (2023), Stable Carbon Isotope Signature of Methane Released From Phytoplankton, Geophysical Research Letters, 50(12), https://doi.org/10.1029/2023GL103317.; DOI: https://doi.org/10.1029/2023gl103317; EDN: https://elibrary.ru/XJNAYI
34. Korneeva, A. O., and M. O. Ulyanova (2023), Methane concentrations in the surface and bottom water layers in the southeastern part of the Baltic sea in summer, autumn and winter sesons of 2022, in Proceedings of the All-Russian Scientific and Practical Conference "Hydrometeorology and Atmospheric Physics: Modern Achievements and Development Trends", pp. 300–302, Publishing and Printing Association of Higher Education Institutions, St. Petersburg (in Russian), EDN: https://elibrary.ru/SEMUJW.;
35. Krechik, V. A., M. V. Kapustina, E. S. Bubnova, and V. A. Gritsenko (2017), Abiotic conditions of bottom waters in the Gdansk deep of the Baltic sea in 2016, Scientific notes of the RGGMU, 48, 186–194 (in Russian), EDN: https://elibrary.ru/ZWUOPX.;
36. Kudryavtseva, E. A., and S. V. Aleksandrov (2019), Hydrological and Hydrochemical Underpinnings of Primary Production and Division of the Russian Sector in the Gdansk Basin of the Baltic Sea, Oceanology, 59(1), 49–65, https://doi.org/10.1134/S0001437019010077.; ; EDN: https://elibrary.ru/WVWOMV
37. Laier, T., and J. B. Jensen (2007), Shallow gas depth-contour map of the Skagerrak-western Baltic Sea region, Geo-Marine Letters, 27(2–4), 127–141, https://doi.org/10.1007/s00367-007-0066-2.; ; EDN: https://elibrary.ru/QCUVXU
38. Lainela, S., E. Jacobs, S. Stoicescu, G. Rehder, and U. Lips (2024), Seasonal dynamics and regional distribution patterns of CO2 and CH4 in the north-eastern Baltic Sea, Preprint egusphere-2024-598, https://doi.org/10.5194/egusphere-2024-598.
39. Lein, A. Y., and M. V. Ivanov (2009), Biogeochemical cycle of methane in the ocean, 546 pp., Nauka, Moscow (in Russian), EDN: https://elibrary.ru/QKIMET.
40. Ma, X., M. Sun, S. T. Lennartz, and H. W. Bange (2020), A decade of methane measurements at the Boknis Eck Time Series Station in Eckernförde Bay (southwestern Baltic Sea), Biogeosciences, 17(13), 3427–3438, https://doi.org/10.5194/bg-17-3427-2020.; ; EDN: https://elibrary.ru/WRTTHH
41. Majewski, P., and Z. Klusek (2011), Expressions of shallow gas in the Gdańsk Basin, Zeszyty naukowe Akademii Marynarki Wojennej, 4(187), 61–71.
42. Malakhova, T. V., I. N. Ivanova, A. A. Budnikov, A. I. Murashova, and L. V. Malakhova (2021), Distribution of Hydrological Parameters over the Methane Seep Site in the Golubaya Bay (the Black Sea): A Connection with Submarine Freshwater Discharge, Russian Meteorology and Hydrology, 46(11), 792–798, https://doi.org/10.3103/S1068373921110091.; ; EDN: https://elibrary.ru/VSSPNK
43. Malakhova, T. V., A. I. Khurchak, V. V. Voitsekhovskaia, and A. V. Fedirko (2024), Distribution of methane in the upper water layer of the northern Black Sea: Seasonal and daily trends and seawater-air emissions, Continental Shelf Research, 281, 105,320, https://doi.org/10.1016/j.csr.2024.105320.; ; EDN: https://elibrary.ru/DSEGAF
44. Markus Meier, H. E. (2007), Modeling the pathways and ages of inflowing salt- and freshwater in the Baltic Sea, Estuarine, Coastal and Shelf Science, 74(4), 610–627, https://doi.org/10.1016/j.ecss.2007.05.019.
45. Mishukova, G. I., A. I. Obzhirov, and V. F. Mishukov (2007), Methane contents in fresh and sea waters and it’s fluxes on border of water-atmosphere at far Eastern region of Asia, 157 pp., Dalnauka, Vladivostok (in Russian), EDN: https://elibrary.ru/TSJECQ.;
46. Mohrholz, V. (2018), Major Baltic Inflow Statistics - Revised, Frontiers in Marine Science, 5, https://doi.org/10.3389/fmars.2018.00384.; ; EDN: https://elibrary.ru/IQMGTT
47. Mosharov, S., I. Mosharova, K. Borovkova, and E. Bubnova (2024), Variability of Primary Productivity as an Initial Link in Carbon Flux Under the Influence of Hydrological Conditions in the Baltic Sea, Russian Journal of Earth Sciences, pp. 1–14, https://doi.org/10.2205/2024ES000888.; ; EDN: https://elibrary.ru/YCZUCI
48. Mosharov, S. A., I. V. Mosharova, O. A. Dmitrieva, A. S. Semenova, and M. O. Ulyanova (2022), Seasonal Variability of Plankton Production Parameters as the Basis for the Formation of Organic Matter Flow in the Southeastern Part of the Baltic Sea, Water, 14(24), 4099, https://doi.org/10.3390/w14244099.; ; EDN: https://elibrary.ru/ICRUNR
49. Nausch, G., M. Naumann, L. Umlauf, et al. (2016), Hydrographic-hydrochemical assessment of the Baltic Sea 2015, Marine Science Reports, (101), https://doi.org/10.12754/msr-2016-0101.
50. Piechura, J., and A. Beszczynska-Moller (2003), Inflow waters in the deep regions of the southern Baltic Sea - Transport and transformations, Oceanologia, 46(1), 4.
51. Piker, L., R. Schmaljohann, and J. F. Imhoff (1998), Dissimilatory sulfate reduction and methane production in Gotland Deep sediments (Baltic Sea) during a transition period from oxic to anoxic bottom water (1993-1996), Aquatic Microbial Ecology, 14, 183–193, https://doi.org/10.3354/ame014183.; ; EDN: https://elibrary.ru/PSVRZN
52. Pimenov, N. V., M. O. Ul’yanova, T. A. Kanapatskii, V. V. Sivkov, and M. V. Ivanov (2008), Microbiological and biogeochemical processes in a pockmark of the Gdansk depression, Baltic Sea, Microbiology, 77(5), 579–586, https://doi.org/10.1134/S0026261708050111.; ; EDN: https://elibrary.ru/LLOFLR
53. Pimenov, N. V., M. O. Ulyanova, T. A. Kanapatsky, et al. (2010), Microbially mediated methane and sulfur cycling in pockmark sediments of the Gdansk Basin, Baltic Sea, Geo-Marine Letters, 30(3–4), 439–448, https://doi.org/10.1007/s00367-010-0200-4.; ; EDN: https://elibrary.ru/LPZCWN
54. Rak, D. (2016), The inflow in the Baltic Proper as recorded in January-February 2015, Oceanologia, 58(3), 241–247, https://doi.org/10.1016/j.oceano.2016.04.001.; ; EDN: https://elibrary.ru/XTNZGN
55. Reeburgh, W. S. (2007a), Global Methane Biogeochemistry, in Treatise on Geochemistry, Elsevier, https://doi.org/10.1016/B0-08-043751-6/04036-6.; ; EDN: https://elibrary.ru/VGWDXT
56. Reeburgh, W. S. (2007b), Oceanic Methane Biogeochemistry, Chemical Reviews, 107(2), 486–513, https://doi.org/10.1021/cr050362v.; ; EDN: https://elibrary.ru/MJIGMH
57. Reindl, A., and J. Bolałek (2012), Methane flux from sediment into near-bottom water in the coastal area of the Puck Bay (Southern Baltic), Oceanological and Hydrobiological Studies, 41(3), 40–47, https://doi.org/10.2478/s13545-012-0026-y.; ; EDN: https://elibrary.ru/RNOEOH
58. Reissmann, J. H., H. Burchard, R. Feistel, et al. (2009), Vertical mixing in the Baltic Sea and consequences for eutrophication - A review, Progress in Oceanography, 82(1), 47–80, https://doi.org/10.1016/j.pocean.2007.10.004.; ; EDN: https://elibrary.ru/MMFLSB
59. Saunois, M., P. Bousquet, B. Poulter, et al. (2016), The global methane budget 2000-2012, Earth System Science Data, 8(2), 697–751, https://doi.org/10.5194/essd-8-697-2016.; ; EDN: https://elibrary.ru/YUWOAJ
60. Schmale, O., J. Schneider von Deimling, W. Gülzow, et al. (2010), Distribution of methane in the water column of the Baltic Sea, Geophysical Research Letters, 37(12), https://doi.org/10.1029/2010GL043115.
61. Schmale, O., J. Wäge, V. Mohrholz, et al. (2017), The contribution of zooplankton to methane supersaturation in the oxygenated upper waters of the central Baltic Sea, Limnology and Oceanography, 63(1), 412–430, https://doi.org/10.1002/lno.10640
62. Stawiarski, B., S. Otto, V. Thiel, et al. (2019), Controls on zooplankton methane production in the central Baltic Sea, Biogeosciences, 16(1), 1–16, https://doi.org/10.5194/bg-16-1-2019.
63. Steinle, L., J. Maltby, T. Treude, et al. (2017), Effects of low oxygen concentrations on aerobic methane oxidation in seasonally hypoxic coastal waters, Biogeosciences, 14(6), 1631–1645, https://doi.org/10.5194/bg-14-1631-2017.; ; EDN: https://elibrary.ru/YYOJZX
64. Stont, Z., T. Bukanova, and O. Goushchin (2015), Variability of sea surface temperature in the South-Eastern Baltic from MODIS data, Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 12, 86–96 (in Russian), EDN: https://elibrary.ru/UITZRP.;
65. Stont, Z., T. Bukanova, and E. Krek (2020), Variability of climatic characteristics of the coastal part of the south-eastern Baltic at the beginning of the 21st century, Bulletin of the Immanuel Kant Baltic Federal University, 1(4), 81–94 (in Russian), EDN: https://elibrary.ru/CYZSPJ.;
66. Tang, K. W., R. N. Glud, A. Glud, S. Rysgaard, and T. G. Nielsen (2011), Copepod guts as biogeochemical hotspots in the sea: Evidence from microelectrode profiling of Calanus spp, Limnology and Oceanography, 56(2), 666–672, https://doi.org/10.4319/lo.2011.56.2.0666.
67. Thießen, O., M. Schmidt, F. Theilen, M. Schmitt, and G. Klein (2006), Methane formation and distribution of acoustic turbidity in organic-rich surface sediments in the Arkona Basin, Baltic Sea, Continental Shelf Research, 26(19), 2469– 2483, https://doi.org/10.1016/j.csr.2006.07.020.
68. Ulyanova, M., and A. Danchenkov (2016), Maritime potential of the Russian sector of the south-eastern Baltic Sea and its spatial usage, Baltica, 29(2), 133–144, https://doi.org/10.5200/baltica.2016.29.12.; ; EDN: https://elibrary.ru/VPGFTH
69. Ulyanova, M., V. Sivkov, T. Kanapatskij, and N. Pimenov (2013), Seasonal variations in methane concentrations and diffusive fluxes in the Curonian and Vistula lagoons, Baltic Sea, Geo-Marine Letters, 34(2–3), 231–240, https://doi.org/10.1007/s00367-013-0352-0.; ; EDN: https://elibrary.ru/SPFUKV
70. Ulyanova, M. O., V. V. Sivkov, L. D. Bashirova, et al. (2022a), Oceanological Research of the Baltic Sea in the 51st Cruise of the PV Akademik Sergey Vavilov (June-July 2021), Oceanology, 62(4), 578–580, https://doi.org/10.1134/S0001437022040130.; DOI: https://doi.org/10.1134/s0001437022040130; EDN: https://elibrary.ru/HIXDFH
71. Ulyanova, M. O., V. V. Sivkov, L. D. Bashyrova, et al. (2022b), Oceanological Research in the Baltic Sea during the 56th Cruise of the Passenger Vessel Akademik Ioffe, Oceanology, 62(1), 136–138, https://doi.org/10.1134/s0001437022010167.; DOI: https://doi.org/10.1134/S0001437022010167; EDN: https://elibrary.ru/YFQQJX
72. Ulyanova, M. O., V. V. Sivkov, S. V. Aleksandrov, et al. (2023), Baltic Sea Research on Cruise 61 of the R/V Akademik Ioffe (June-July 2022), Oceanology, 63(5), 752–754, https://doi.org/10.1134/s000143702305017x.; ; EDN: https://elibrary.ru/KIKFGX
73. Voigt, C. (2023), The power of the Paris Agreement in international climate litigation, Review of European, Comparative & International Environmental Law, 32(2), 237–249, https://doi.org/10.1111/reel.12514.
74. Weber, S., J. Beutel, R. Da Forno, et al. (2019), A decade of detailed observations (2008-2018) in steep bedrock permafrost at the Matterhorn Hörnligrat (Zermatt, CH), Earth System Science Data, 11(3), 1203–1237, https://doi.org/10.5194/essd-11-1203-2019.; ; EDN: https://elibrary.ru/UBYRNJ
