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


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 3, pp. 28-41

Variability of the June reflectance maximum in the Black Sea according to the decadal satellite data

G.S. Karabashev1 , M.A. Evdoshenko1 
1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
A study is made of the coccolithophore blooms occurring in the Black Sea from late May to early July. The blooms enable one to monitor the vital activity of algae in aquatic environment by satellite means thanks to the multiple enhancement of the sea surface reflectance. We used the data of ocean color scanners SeaWiFS and MODIS-Aqua from 2001 to 2012 placing more emphasis on variations of reflectance in 2012, the year of extraordinary powerful blooming. According to comparative analysis of reflectance changes within the four ecologically-different testing regions, the blooming covers solely the deep-water basin, features considerable spatial inhomogeneity, and peaks in the east of the sea. It is shown that the manifestations of blooming relax faster in the longwave range of the visible spectrum than in its middle part which is most probably due to the difference of thicknesses of layers where the ascending radiances of shorter and longer wavelength originate. Our findings refine the patterns of coccolithophore blooming in the Black Sea and must be taken into account when interpreting the early-summer images of the basin.
Keywords: remote sensing, coccolithophore bloom, the Black Sea, long-term variability, the June anomaly of reflectance
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