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


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 5, pp. 268-281

Seasonal and diurnal cycle of the Black Sea water temperature from temperature-profiling drifters data

V.A. Rubakina 1 , A.A. Kubryakov 1 , S.V. Stanichny 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 18.09.2019
DOI: 10.21046/2070-7401-2019-16-5-268-281
In the present study, the features of the temperature diurnal cycle of the Black Sea upper layer during different seasons were studied using temperature-profiling drifters data and the scanner SEVIRI. According to the thermodrifters data, the maximal negative temperature anomalies in the surface layer (horizon of 0.2 m) are typical for period from 06:00 to 07:00 in the morning, and the maximum positive anomalies in the second half of the day from 15:00 to 17:00. The largest diurnal absolute temperature deviations from mean seasonal values are noted in the spring-summer period with a maximum in May. Set of the diurnal cycle features in the cold period of the year is noted. In January, the temperature on the horizon 0.2 m is lower than on the horizons of 12.2 and 15.2 m during the day. On the horizon of 0.2 m, the diurnal cycle with a maximum at 16:00 and a minimum at 08:00 is expressed. In February and in March, during the daytime, the surface heats up more strongly than the layers of 12.2–15.2 m, and during the night cooling period the temperature becomes lower than at these horizons. Events of significant diurnal warming in the cold and warm period of the year are considered. In February 2014, according to the data of drifter N 248990, four significant events were identified. The difference between the maximum and minimum temperature values during the day reached 0.6 °C on a horizon of 0.2 m. Temperature changes of the horizons below 10 m were not observed. During the warm period of the year the difference between the maximum and minimum values during the day on a horizon of 0.2 m for significant diurnal warming events exceeded 4 °C and reached 5.1 °C. The rise of short-wave radiation fluxes and the decrease of wind mixing lead to the water stratification and the observed daily warming in the summer and winter periods of the year. All of these events were observed during calm weather conditions in which the wind speed did not exceed 5 m/s and cloud cover was absent. A brief comparison of the SEVIRI data with the temperature-profiling drifters data was carried out. The performed intercalibration shows a good conformity between satellite and contact data. Relative errors of satellite measurements do not exceed 0.4 °C.
Keywords: temperature-profiling drifters, SEVIRI, seasonal and diurnal cycle of the water temperature, Black Sea, diurnal warming
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