Optical Characterization Of The Eastern Adriatic Waters

摘要

This paper aims to demonstrate the water optical properties in the middle and southern Adriatic. Particular locations are investigated in the channel and bay areas as well as the open sea. The research is based on the spectral measurements of daylight intensity, performed with the profiling radiometer PRR800 (Biospherical Instruments Inc.). High resolution measurements of downward irradiance and upward radiance were carried out at 14 wavelengths from UV to visible light (340; 380; 412; 443; 465; 490; 510; 532; 555; 589; 625; 665; 683 and 710 nm) together with the PAR (400-700 nm) measurements. Among the measurements performed mainly in 2003, those were selected that demonstrate high spatial variability of optical characteristics, pointing to the different exposure of the areas to the coastal influences or to the influence of clear open sea waters. Optical water types determined for the selected stations demonstrate large variability. The comparison is performed with the optical water types established by Jerlov, from PAR attenuation and from the irradiance transmittance spectra at 10m depth. The open sea stations and some channel stations show characteristics like clear oceanic waters of optical types I or II. Stations located in channel areas, semi-enclosed bays and the stations exposed to the river runoffs have characteristics of coastal optical water types, spanning over a wide range of types.