Optical remote sensing using satellites holds the promise of determining biological and optical properties globally. Much research has been carried out on the inversion of the spectral radiance signals detected by satellite. However, almost all inversion algorithms are based on the assumption of a homogeneous ocean. How do thin layers of particulate matter affect the reflectance of the ocean? A thin layer exhibits increases in absorption and scattering parameters (inherent optical properties, IOPs) (Preisendorfer, 1961) compared with surrounding waters. These increases are due primarily to phytoplankton and in a lesser degree to dissolved organic matter.