## Abstract

We evaluated the performance of a recently developed absorption partitioning model [J. Geophys. Res. Oceans **120**, 2601 (2015) [CrossRef] ] that derives the spectral absorption coefficients of non-algal particles, ${a}_{NAP}(\lambda )$, and colored dissolved organic matter, ${a}_{g}(\lambda )$, from the total absorption coefficient of seawater. The model’s performance was found unsatisfactory when the model was tested with a large dataset of absorption measurements from diverse open-ocean and coastal aquatic environments. To address these limitations, we developed a new model based on a different approach for estimating ${a}_{NAP}(\lambda )$ and ${a}_{g}(\lambda )$ from the sum of these two coefficients, ${a}_{dg}(\lambda )$, within the visible spectral region. The very good overall performance of the model is demonstrated, with no tendency for bias and relatively small absolute differences (the median $\le 20\%$) between the model-derived and measured values of ${a}_{NAP}(\lambda )$ and ${a}_{g}(\lambda )$ over a wide range of aquatic environments.

© 2019 Optical Society of America

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