This data set includes original data andmodelled outputs used in publication entitled: Optical constituent concentrations and uncertainties obtained for Case 1 and 2 waters from a spectral deconvolution model applied to in situ IOPs and radiometry, submitted to Journal of Geophysical Research: Oceans. It includes abosrption and backscattering data, in situ radiometry and associated biogeochemical properties (CHL, MSS and CDOM) collected on the BP09 cruise in the Ligurian Sea, March 2009. It also includes results of a new spectral deconvolution model applied to in situ measurements ofbb/a and estimates of bb/a derived from in situ radiometry. These results include both estimates of biogeochmical concentrations and propagated uncertainties.