A Dual-Band Model for the Vertical Distribution of Photosynthetically Available Radiation (PAR) in Stratified Waters

Based on the optical properties of water constituents, vertical variation photosynthetically available radiation (PAR) can be well modeled with hyperspectral resolution; intensive computing load, however, demands simplified modeling that easily embedded in marine physical and biogeochemical models. While PAR profile homogeneous waters now accurately simple parameterization, it is still a big challenge to model stratified limited variables. In this study, based empirical equations simulations, we propose dual-band characterize distribution using chlorophyll concentration (Chl). With an inclusive dataset including cruise data collected Southeast Pacific BGC-Argo global ocean, was thoroughly evaluated for its general applicability three aspects: 1) estimating entire from sea-surface Chl profile, 2) euphotic layer depth 3) just below sea surface situ radiometry measurements. It demonstrated proposed capable generating similar estimates as model, thus offering effective module incorporated large-scale ecosystem and/or circulation models efficient calculations.