Estimates of Hyperspectral Surface and Underwater UV Planar and Scalar Irradiances from OMI Measurements and Radiative Transfer Computations

Quantitative assessment of the UV effects on aquatic ecosystems requires an estimate in-water hyperspectral radiation field. Solar in ocean waters is estimated a global scale by combining extraterrestrial solar irradiance from Total and Spectral Irradiance Sensor (TSIS-1), satellite estimates cloud/surface reflectivity, ozone Ozone Monitoring Instrument (OMI) chlorophyll concentration Moderate Resolution Imaging Spectroradiometer (MODIS) with radiative transfer computations ocean-atmosphere system. A comparison collocated OMI-derived surface Marine Optical Buoy (MOBY) measurements shows good agreement within 5% for different seasons. To scalar at water, we propose scaling planar irradiance, calculated observation, basis Hydrolight computations. calculations show that diffuse attenuation coefficients depth are quite close to each other. That why differences between penetration depths small do not exceed couple meters. dominant factor defining concentration. There other constituents water absorb addition chlorophyll; absorption these can be related Case I using inherent optical properties (IOP) model. Other input parameters less significant. The DNA damage vary few meters areas productive about 30–35 m clearest waters. machine learning approach (an artificial neural network, NN) was developed based full physical algorithm computational efficiency. NN very performance predicting (within 2%).