Evaluating the BRDF correction for a new semi-analytical model using field measurements.

Twardowski and Tonizzo [1], TT18 herein, present a radiative transfer approximation called ZTT (Zaneveld-Twardowski-Tonizzo) based on the theoretical work of Zaneveld [2] that relates inherent optical properties (IOPs) of the ocean to remote sensing reflectance (rrs [rs−1]) and accounts for bidirectional reflectance distribution function (BRDF) effects. The relationships for ZTT do not have spectral resolution limitations and are generic to any natural waters, so the model is thus directly applicable to future hyperspectral satellite ocean color missions such as NASA PACE and Sentinel-10 CHIME. As a BRDF correction algorithm, IOPs are first derived through ZTT inversion at the prevailing solar-viewing geometry; the forward ZTT model is then carried out at the conceptual normalized geometry of zero solar zenith, nadir viewing. One of the few sensors available measuring the full hemispherical upwelling radiance distribution is NuRADS [3]. Herein an assessment of the ZTT BRDF model is carried out with NuRADS data for stations covering 3 field sites: the Ligurian Sea, the S. Pacific gyre, Monterey Bay. Comparisons are made with current state-of-the-art BRDF models and full radiative transfer simulations. [ABSTRACT FROM AUTHOR]

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