Suslin V. V., Churilova T. Ya., Lee M., Moncheva S., Finenko Z. Z.
We compared the global and two regional chlorophyll-a algorithms for SeaWiFS and MODIS-Aqua/Terra instruments in the Black Sea based on in situ measurements of the chlorophyll-a concentration (below Са) in the upper sea layer during 1997—2015. Comparison results for three SeaWiFS, MODIS-Aqua and MODIS-Terra instruments showed: 1) the standard product NASA overestimates Са throughout the range of variability of Са in the Black Sea, the average value of the relative error is about 300 %; 2) the product of the Shirshov’s Institute of Oceanology has the same slope in the logarithm axises {Са(in situ), Са(algorithm)}, like the standard NASA product, but due to the shift, in the Са range from 0.2 to 0.9 mg∙m−3 is better, in terms of relative error (~80 %) corresponds to observations; 3) the product of the Marine Hydrophysical institute gives the smallest relative error (~40 %), but it has a high sensitivity to the quality of the remote spectral reflectance (RRS), that is, to the ratio of RRS in two bands from 480—560 nm.
