Effects of Vertical Chlorophyll Structure and Solar Irradiance on Remote SensingOcean Color Spectrum

摘要

A model has been developed to investigate the influence of the subsurfacechlorophyll profile on the complete spectral water-leaving radiance (ocean color) from 400-700 nm. The spectral reflectivity of vertical chlorophyll layers is modeled and coupled with the spectral incident irradiance at the sea surface. Model results indicate similar water-leaving radiance signatures can be obtained from different subsurface chlorophyll profiles. This model provides an interpretation of remote sensing ocean color signatures and possible subsurface structure. The inherent optical properties of the backscatter and absorption coefficient which are determined from the vertical chlorophyll profile for Case 1 water are used to calculate the subsurface spectral reflectivity at layer depths. Subsurface reflectivity models are coupled with an atmospheric model of the incident solar irradiance spectrum. The atmospheric irradiance model was run for different cloud cover and different optical depths (ozone, aerosol). The coupled model results compute the remote sensing color spectrum (upwelling radiance) at the sea surface. The study shows the effect of a varying chlorophyll maximum depth and intensity on the upwelling radiance distribution and the ocean color signatures.