Colored dissolved organic matter absorption at global scale from ocean color radiometry observation: Spatio-temporal variability and contribution to the absorption budget

A semi-analytical model (CDOM-KD2) based on the light vertical attenuation coefficient (Kd(?)) has been developed for estimating absorption by colored dissolved organic matter, acdom(443), from ocean color remote sensing at global scale. The performance of this new inversion together with that former models Shanmugam (2011) (S2011), Chen et al. (2017) (C2017) and Aurin (2018) (A2018) was evaluated in situ matchup validation data sets gathering worldwide distributed samples. An overall consistency acdom(443) estimated S2011, C2017 CDOM-KD2 a slightly better latter method observed (MAPD 27.42% 30.85% open satellite data, respectively), emphasizing possible specific assessment dynamics over including most oligotrophic waters. At 443 nm average relative contribution to detrital acdm(443) is 61% ± 14%, while non-water absorption, anw(443), 35% 26%. Strong spatial disparities are however both temporal budget. decoupling between particulate (i.e. non-living) matter phytoplankton gyre areas where low variability globally observed. This contrasting water masses influenced terrestrial inputs as well equatorial subtropical impacted main oceanic currents CDOM loads budget more variable.