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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, 2017, Vol. 14, No. 7, pp. 238-249

Formation of the cold long-lasting anomaly of Black Sea surface temperature according to satellite data

V.V. Efimov 1 , O.I. Komarovskaya 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 30.10.2017
DOI: 10.21046/2070-7401-2017-14-7-238-249
On the basis of NOAA-ESRL data (http://www.esrl.noaa.gov/psd/) for the period of 1982–2013 and data of regional climate reanalysis of atmospheric circulation with high spatial resolution, the development of long-lasting anomaly of the Black Sea surface temperature in the autumn period is considered. The technique to create composites of mesolarge-scale structures of warm and cold anomalies allowing to reveal the main spatial features of anomalies and to estimate their sizes is described. The annual course of average monthly cold anomalies, average for all 32-year period presented by satellite data, for the center of the area of maximum cold anomalies is given. The histogram of sizes of anomalies for this area of the sea for the autumn periods is provided. It is shown that the rapid decrease in temperature as a result of episodes of high wind speeds, leading to a rapid burial of the thermocline, are relatively rare and cannot serve as the main cause of the anomaly. The characteristics of the vorticity field of wind speed and their connection with the development of cold anomalies are considered. It is shown that formation of the long-lasting cold anomaly is connected with the mechanism of Ekman pumping of cold water in the top layer of the sea due to cyclonic vorticity of wind stress field on the surface. An approximate numerical estimate of size of the anomaly is given.
Keywords: surface temperature of the Black Sea, cold anomaly, Ekman pumping, cyclonic vorticity, annual variation
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