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Journal of Plankton Research Vol.22 no.4 pp.659-668, 2000
© Oxford University Press 2000

Variability of the amplification factor of light absorption by filter-retained aquatic particles in the coastal environment

Stelvio Tassan, Giovanni Massimo Ferrari, Annick Bricaud1 and Marcel Babin1

SAI, CEC Joint Research Center, Ispra Establishment, 21020 Ispra, Italy and 1 Laboratoire de Physique et Chimie Marines, CNRS and Université P. et M. Curie, BP 8, 06238 Villefranche-sur-Mer, France

The amplification of light absorption by aquatic particles retained on glass-fiber filters, the so-called ß factor, has been measured for 29 stations located in the varying coastal environment of the northern basin of the Adriatic Sea. The spectral values of the optical density of particles have been determined on glass-fiber filters by the standard transmittance (T) method as well as by the transmittance-reflectance (T-R) method, which performs an accurate correction for light backscattering by the particles, and on glass slides by the modified filter–transfer–freeze (FTF) method, which eliminates the pathlength amplification. It has been shown that the relationships between the optical densities of particles on glass slides (ODsus) and on glass-fiber filters (ODf) have a low dispersion when ODf is measured by the T-R method: in this case, the use of a single expression for all stations adds an error that does not exceed the typical uncertainty of the measurement of the filter-retained particle absorption. On the contrary, the ODsus versus ODf plots obtained by the T method exhibit considerable variability, apparently due to the approximate correction for light backscattering performed by this method, and do not permit the use of a single equation for all stations.


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