ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 2, pp. 230-240

Features of temperature conditions and distribution of chlorophyll a concentration in the Sea of Okhotsk during pollock spawning from satellite data

D.M. Lozhkin 1 , Zh. R. Tshay 1 , G.V. Shevchenko 1, 2 
1 Russian Federal Research Institute of Fisheries and Oceanography, Sakhalin Branch, Yuzhno-Sakhalinsk, Russia
2 Institute of Marine Geology and Geophysics FEB RAS, Yuzhno-Sakhalinsk, Russia
Accepted: 25.02.2021
DOI: 10.21046/2070-7401-2021-18-2-230-240
Based on long-term satellite observations of the surface of the Sea of Okhotsk in the spring period, the dynamics of water temperature and chlorophyll  a concentration in three biostatistical pollock spawning areas, southwestern and western Kamchatka and northeastern Sakhalin, are analyzed. It is shown that this period is characterized by a downward trend in sea surface temperature, most pronounced in May in waters adjacent to Sakhalin Island. These processes are probably caused by an increase in atmospheric temperature during the winter in the Arctic and, as a result, a decrease in the Sea of Okhotsk ice cover, because a decrease in ice cover area leads to an increase in the depth of winter convection. The decrease in the heat content of the surface layer was observed in all regions, especially sharp in 2013 after the abnormally warm spring of 2012. Despite the decrease in the ice area, pollock spawning areas are characterized by active photosynthetic activity and high bio-productivity, which indicates a stable state of the food supply of this important fishing object. Off the coast of western Kamchatka in April and May, zones of high concentrations of chlorophyll  a are localized on the shelf, and in June, their displacement to the continental slope is noted. In northeastern Sakhalin, intensive photosynthesis processes occur in the central and southern part of the coast in the areas of ice melting in May, and in June — in the northern part in the zone of penetration of modified Amur waters.
Keywords: sea surface temperature, ice coverage, phytoplankton, bio-productivity, MODIS
Full text


  1. Avdeev G. V., Ovsyannikova S. L., Ovsyannikov E. E., Estimation of walleye pollock stock in the northern Okhotsk Sea by results of ichtyoplancton survey 2004, Voprosy rybolovstva, 2005, Vol. 6, No. 2(22), pp. 298–325 (in Russian).
  2. Venttsel M. V., Krylov V. V., Levashova S. S., Regularities in the distribution of phytoplankton in the water area of the North-West Pacific, In: Morskie gidrobiologicheskie issledovaniya, Moscow: VNIRO, 2000, pp. 11–21 (in Russian).
  3. Gidrometeorologiya i gidrokhimiya morei, T. 9: Okhotskoe more, Vyp. 1: Gidrometeorologicheskie usloviya (Hydrometeorology and hydrochemistry of the seas, Vol. 9, Okhotskoe more, Issue 1, Gidrometeorologicheskie usloviya), Saint Petersburg: Gidrometeoizdat, 1998, 342 p. (in Russian).
  4. Zuenko Yu. I., Nuzhdin V. A., Impact of modern changes of oceanographic conditions in the Japan Sea on state of the Primorye pollock population, Voprosy rybolovstva, 2018, Vol. 19, No. 3, pp. 377–386 (in Russian).
  5. Zuenko Yu. I., Aseeva N. L., Glebova S.Yu., Gostrenko L. M., Dubinina A. Yu., Dulepova E. P., Zolotov A. O., Loboda S. V., Lysenko A. V., Matveev V. I., Muktepavel L. S., Ovsyannikov E. E., Figurkin A. L., Shatilina T. A., Recent changes in the Okhotsk Sea ecosystem (2008–2018), Izvestiya Tikhookeanskogo nauchno-issledovatel’skogo rybokhozyaistvennogo tsentra, 2019, Vol. 197, pp. 35–61 (in Russian).
  6. Lozhkin D. M., Shevchenko G. V., Trends in sea surface temperature of the Sea of Okhotsk and adjacent water areas by satellite data in 1998–2017, Issledovanie Zemli iz kosmosa, 2019, No. 1, pp. 55–61 (in Russian).
  7. Matveev V. I., Gidrokhimicheskie usloviya biologicheskoi produktivnosti Okhotskogo morya: Diss. kand. geogr. nauk (Hydrochemical conditions of the Okhotsk Sea biological productivity: Cand. geogr. sci. thesis), Vladivostok: TINRO, 2006, 141 p. (in Russian).
  8. Sea of Okhotsk pollock (Fishing season forecast), Vladivostok: TINRO-Tsentr, 2019, 69 p. (in Russian).
  9. Pishchalnik V. M., Romanyuk V. A., Minervin I. G., Batukhtina A. S., Analysis of dynamics for anomalies of the ice cover in the Okhotsk Sea in the period from 1882 to 2015, Izvestiya Tikhookeanskogo nauchno-issledovatel’skogo rybokhozyaistvennogo tsentra, 2016, Vol. 185, pp. 1–12 (in Russian).
  10. Rostov I. D., Dmitrieva E. V., Vorontsov A. A., Trends in climatic changes in the thermal conditions of the coastal areas of the Sea of Okhotsk over the last decades, Izvestiya Tikhookeanskogo nauchno-issledovatel’skogo rybokhozyaistvennogo tsentra, 2017, Vol. 191, pp. 176–195 (in Russian).
  11. Khen G. V., Ustinova E. I., Figurkin A. L., Zuenko Yu. I., Novikov Yu. V., Sorokin Yu. D., Gamanyuk M. V., Hydrological conditions of the northwestern Pacific and the Far Eastern seas at the beginning of the 21st century and expected trends, Voprosy promyslovoi okeanologii, 2004, Issue 1, pp. 40–58 (in Russian).
  12. Khen G. V., Basyuk E. O., Sorokin Yu. D., Ustinova E. I., Figurkin A. L., Surface thermal conditions in the Bering and Okhotsk Seas in the early 21 Century against previous semi-centennial changes, Izvestiya Tikhookeanskogo nauchno-issledovatel’skogo rybokhozyaistvennogo tsentra, 2008, Vol. 153, pp. 254–263 (in Russian).
  13. Tskhai Zh. R., Prostranstvenno-vremennaya izmenchivost’ kontsentratsii khlorofilla-a v poverkhnostnom sloe Okhotskogo morya i prilegayushchikh akvatorii po sputnikovym dannym: Avtoref. diss. kand. geogr. nauk (Spatio-temporal variability of chlorophyll-a concentrations in the surface layer of the Sea of Okhotsk and adjacent waters according to satellite data: Ext. abstract Cand. geogr. sci. thesis), Yuzhno-Sakhalinsk, 2017, 24 p.
  14. Tskhai Zh. R., Khen G. V., The comparison of satellite and in situ chlorophyll-a concentration of the Okhotsk Sea and adjacent waters, Issledovanie Zemli iz kosmosa, 2016, No. 1–2, pp. 187–198 (in Russian).
  15. Tskhai Zh. R., Khen G. V., Estimation of the total chlorophyll-a content in the Sea of Okhotsk using satellite data, Issledovanie Zemli iz kosmosa, 2020, No. 6, pp. 34–46 (in Russian).
  16. Shuntov V. P., Biologiya dal’nevostochnykh morei Rossii (Biology of Far Eastern Seas of Russia), Vol. 1, Vladivostok: TINRO-tsentr, 2001, 580 p. (in Russian).
  17. Funamoto T., Causes of walleye pollock (Theragra chalcogramma) recruitment decline in the northern Sea of Japan: implications for stock management, Fisheries Oceanography, 2011, Vol. 20, Issue 2, pp. 95–103.
  18. Funamoto T., Yamamura O., Shida O., Itaya K., Mori K., Hiyama Y., Sakurai Y., Comparison of factors affecting recruitment variability of walleye pollock Theragra chalcogramma in the Pacific Ocean and the Sea of Japan off northern Japan, Fish Science, 2014, Vol. 80, pp. 117–126, DOI: 10.1007/s12562-014-0716-z.
  19. State of the Climate in 2017, In: Bull. American Meteorological Society, Blunden J., Arndt D. S., Hartfield G. (eds.), 2018, Vol. 99, No. 8, pp. Si–S332, DOI: 10.1175/2018BAMSStateoftheClimate.1.