The aims of this work are to present an analysis quality solar radiation data and develop several hourly models photosynthetically active (PAR) using combinations radiometric variables such as global horizontal irradiance (GHI), diffuse (DHI), direct normal (DNI) from their dimensionless indices atmospheric clearness index (kt), fraction (kd), (kb) together with elevation angle (?). GHI, DHI, D...

The diffuse attenuation coefficient of photosynthetically active radiation is an important inherent optical property the subaquatic light field. This parameter, as a measure transparency medium, good indicator water quality. Degradation properties due to anthropogenic disturbances common phenomenon in freshwater ecosystems. In this study, we used four algorithm-based Landsat 8 OLI and Sentinel-...

Brown band syndrome is a new coral affliction characterized by a local accumulation of yet-unidentified ciliates migrating as a band along the branches of coral colonies. In the current study, morphologically intact zooxanthellae (= Symbiodinium) were observed in great numbers inside the ciliates (>50 dinoflagellates per ciliate). Microscale oxygen measurements and variable chlorophyll a fluore...

The distribution of light in the canopy is a major factor regulating the growth and development of a plant. Consequently, simulation of light environment is an important component of functionalstructural plant modelling. The main variables of interest are the quantity of photosynthetically active radiation (PAR) reaching different elements of the plant canopy, and the quality (spectral composit...

Incident photosynthetically active radiation (PAR) is required by almost all terrestrial ecosystem models and many other applications. The current PAR products that are developed for climate studies have much coarser spatial resolution and higher temporal resolution and are not suitable for land applications. This article reviews stateof-the-art methods for mapping land spatial-resolution incid...