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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, 2018, Vol. 15, No. 7, pp. 141-152

Variability of the acoustic backscattering from ADCP and satellite observations in the northeastern part of the Black Sea

V.B. Piotukh 1 , S.A. Myslenkov 2, 1 , A.G. Zatsepin 1 , A.G. Aleksandrova 1 , D.M. Soloviev 3, 1 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Lomonosov Moscow State University, Moscow, Russia
3 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 19.11.2018
DOI: 10.21046/2070-7401-2018-15-7-141-152
The paper presents an analysis of the acoustic backscattering variability measured by the moored acoustic Doppler current profiler (ADCP). The ADCP operated at the test site of the Shirshov Institute of Oceanology RAS near Gelendzhik in 2011–2012. An amplitude calibration of the ADCP allows minimizing the errors connected with the changing sensor distance and signal attenuation by the sea water. In total, 37 events of a sharp increase of the acoustic backscattering intensity were identified. The parameters of the wind waves (calculated with the SWAN wave model) were compared with the change of the echo signal intensity. It was found that the significant wave height over 1 m led to an increase in the echo signal intensity, which is associated with the disturbance of bottom sediments due to wave breaking in shallow water. It was found that 60 % of cases of the increase in acoustic backscattering intensity were associated with wind waves. Part of the local maxima of the echo signal in the upper layer was caused by the presence of air bubbles, which were produced by a strong wind (the Novorossiysk bora or strong storms at south winds). The longest period of the increase in the echo signal intensity was associated with the blooming of coccolithophorids. There were other cases connected with river runoff and precipitation.
Keywords: acoustic backscattering, ADCP, satellite observations, Black Sea
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