Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 7, pp. 267-279
Prospects for improving the accuracy of estimates of the parameters of coccolithophoride blooms in the Barents Sea from satellite data
O.V. Kopelevich
1 , P.G. Karalli
1, 2 , A.S. Lokhov
1 , I.V. Sahling
1 , S.V. Sheberstov
1 1 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
2 Moscow Institute of Physics and Technology, Moscow region, Dolgoprudnyi, Russia
Accepted: 13.12.2017
DOI: 10.21046/2070-7401-2017-14-7-267-279
In the previously proposed algorithm (Kopelevich et al., 2012), the concentration of coccolithophore cells Ncoc during the coccolithophore blooms (CB) in the Barents Sea is estimated through the values of the particle backscattering coefficient bbp derived from satellite data. It is assumed that the bbp values are entirely determined by plated cells and detached coccoliths; the accepted values of specific backscattering coefficients for cells and coccoliths were taken from Voss et al. (1998). The K factor for relationship between Ncoc and bbp depends on the ratio of the number of detached coccoliths to the number of plated cells and can be varied several times. In the work presented, quantitative estimates of changes in the K factor are made by using data of the direct measurements 2014–2016. According to the estimates, the value of K depends on the age of the blooms — the mean K value for the blooms observed until mid-August is equal to 145, later — 65. The monthly means of Ncoc and of the concentration of particulate inorganic carbon PIC (standard product of NASA), derived from satellite data for July, August and September 1998– 2016, were compared. The correlation between them proved to be quite close. Analysis of measurements of particles size in the sea water by means of the Coulter counter in the Barents Sea expedition in July–August 2017 showed the maxima near 5 m clearly visible on the numerical distributions in the presence of coccolithophore blooms, they are not observed in the absence of the blooms. A close correlation was found between the particle concentration in the fractions of 2–5 μm and 5–10 μm and the bbp values derived from the measurement data by a floating spectroradiometer. These results indicate a good consistency of data and opportunities for using the Coulter counter data to assess the effect of cell size changes and the "non-coccoithphore" contribution to the bbp values from terrigenous particles and phytoplankton cells of other species.
Keywords: coccolithophore blooms, Barents Sea, satellite data, biooptical algorithm, analysis of the acting factors, improving the accuracy
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