Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 3, pp. 254-268
Comparison of sea surface temperature in the Black Sea measured by satellite radiometers and CTD-sensor
A.G. Zatsepin
1 , O.I. Podymov
1 , D.M. Soloviev
2 1 Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 30.04.2021
DOI: 10.21046/2070-7401-2021-18-3-254-268
A joint analysis of satellite-measured sea surface temperature (SST) in the northeastern Black Sea and hydrological cross-sections studies, conducted by RV Akvanavt in 1998–2007, was carried out to provide an additional understanding of vertical structure of mesoscale temperature anomalies observed on the sea surface from space, as well as to clarify their generation mechanisms. Comparison of the satellite-measured SST with the CTD-measured temperature at about 1 m depth has demonstrated that discrepancies in the data are almost absent in the night during the winter months and match the satellite measurement precision. Daytime warming of the upper layer in winter results in the satellite temperature being 0.25 °C higher on average than CTD data. In summer months the satellite-measured SST is most close to the ship data during quasi-synchronous nighttime measurements. A significant increase of the satellite-measured SST over the CTD data (up to 3 °C) was observed during daytime in summer, being produced by a development of diurnal thermocline. On average, the difference between the satellite- and CTD-measured temperature is 2–4 times higher in summer, than in winter. With other things being equal, the discrepancies between the SST data produced by the satellite and CTD measurements along the cross-section depend on the Rim Current intensity and mesoscale variability of subsurface layer temperature. With weak Rim Current and high mesoscale variability, the discrepancies are higher than in the opposite case. The effect of cyclonic and anticyclonic mesoscale eddies in the Black Sea on the SST is discussed, with a demonstration of a close connection between the SST and water advection and convection.
Keywords: Black Sea, ship-borne cross-sections, CTD measurements, temperature of subsurface layer, satellite measurements, sea surface temperature, data comparison
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