Apparent Optical Properties DOORS cruise 2, leg 1, 01-10 September, 2023

Apparent Optical Properties of seawater were determined from multispectral free-fall system (MicroPro, Satalantic Inc)  during /V Mare Nigrum cruise #2, leg 1 at  15 stations located in the Romanian Black Sea waters . The MicroPro simultaneously measure the upwelling radiance Lu (z, λ), the downward irradiance Ed (z, λ) and the upward irradiance Eu (z, λ) as a function of depth z and wavelength λ, in addition to the above–water downward irradiance Ed (0+λ). All applied sensors (i.e., radiometers of the OCR-507) have equivalent spectral channels with 10 nm bandwidth centered at the nominal wavelengths 412, 443, 490, 510, 555, 665, and 683 nm. Data products from the free-fall optical profilers include spectral values of: remote sensing reflectance, normalized water–leaving radiance, diffuse attenuation coefficient.