Abstract: The fluorescence spectra and absorption coefficients of chromophoric dissolved organic matter(CDOM)and levels of petroleum－polluted materials were analyzed by navigational style at three depths of 0，5 and 10 meters at 32 stations in Liaodong Bay from April 14， 2015 to May 3， 2015 to understanding of distribution characteristics of CDOM in Liaodong Bay.The results showed that three characteristics of the CDOM fluorescence were observed throughout the Liaodong Bay.Firstly the fluorescent spectra of CDOM in surface sea water(0 m)were divided into three types of curves， monopeak， dual peak and tripeak； fluorescence spectra of CDOM in the 5 m and 10 m water in the east coast were mainly monopeak，and dual peak； all fluorescence spectra had a fluorescence peak at excitation wavelength/emission wavelength of 225－235 nm/325－350 nm due to the release of tryptophan produced by the degradation of marine phytoplankton.Secondly the fluorescence intensity of surface sea water was obviously increased，and the scope of the fluorescence peak was also expanded in Shuangtaizihe Estuary and close to the offshore oil platform with combined effects of oil substances and CDOM.Thirdly distribution trends of the maximum and minimum values of fluorescence intensity were basically the same at 0 m and 10 m water layer，but the fluorescence intensity change was relatively complicated at 5 m water layer.There was no significant relationship between fluorescence intensity and water depth，without changes in position of all types of fluorescence peaks with depth.Finally a model was established for solving the spectral slope S from the fluorescence peak intensity Afand CDOM absorption coefficient at 440 nm ag(440)，which provides a new method for the inversion of spectral slope S by using fluorescence and visible light remote sensing.
2018, Vol. 33 
