статья в журнале

En

Sovremennye Problemy Distantsionnogo Zondirovaniya Zemli iz Kosmosa

ISSN:20707401

2023

10.21046/2070-7401-2023-20-1-253-268

WEVTEQ

On the basis of medium resolution optical satellite data from 2001 to 2022, cases of intensive development of cyanobacteria in the southern part of the Caspian Sea were identified — mainly in July and August in 2005, 2008–2010, 2017, 2018 and 2021. In 2009, intensive development of cyanobacteria was observed in September and early October, and in 2021, the first signs of intensive development of cyanobacteria were recorded in June. For all noted cases, stages of development are detected and spatiotemporal changes are described. We also analyzed the background conditions that could contribute to the intensive development of cyanobacteria — changes in sea surface temperature, wind speed and stability in summer, and an increase in the concentration of chlorophyll-a in periods preceding the development of cyanobacteria. In particular, it was noted that the intensive development of cyanobacteria occurs mainly in conditions of high heating of surface waters, against the background of the predominance of weak and stable winds. Probably, the vital activity of other phytoplankton species is an additional source of nutrients — higher concentrations of chlorophyll a are recorded before periods of intensive development of cyanobacteria. In addition, an increase in sea surface temperature was noted in the area of intensive development of cyanobacteria. According to AVHHR NOAA-18 data, the temperature contrast between the area with floating cyanobacteria and the surrounding areas can exceed 4 °C. © 2023 Space Research Institute of the Russian Academy of Sciences. All rights reserved.

chlorophyll a concentration, cyanobacteria, intensive development of cyanobacteria, Nodularia Spumigena Mert, optical data, satellite data, South Caspian, surface temperature, wind speed

2023-04-19 15:39:35