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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

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
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