Study On The Colored Dissolved Organic Matter In Water And Sediment Of The Yellow-East Sea

EEMs-PARAFAC is currently one of the most effective research means to study marine CDOM. This study used this method to research CDOM of water and the sediment of the Yellow-East Sea, combined with integrated seasonal characteristics and the condition of the temperature and salinity of that area, its component constituting, source, seasonal feature and distribution pattern were analyzed.(1) Four components were obtained by analysis of spring North Yellow Sea: Humic-like components C1(260,315/425)and C2(295,355/490); protein-like components C3(275/310)and C4(230,290/345), which showed that they shared some similarities in origin and structure, and the same type components had more similar origins. Four fluorescent components and the total fluorescence intensity distributing features at both horizontal and vertical directions indicate that CDOM at the near shore side had a noticeable and combined impact by terrestrial input, coastal currents and ocean water masses. HIX and BIX also showed that CDOM were more impacted by terrigenous sources, while the sea side were more impacts by biological activity.(2) Using PARAFAC model to analyses samples of the Yellow-East Sea and 4 components were found: the humic-like C1(260,310/415nm) and C3(295,360/500), the protein-like C1(280,335)and C4(270/310). The horizontal and vertical distribution of total florescent intensity showed a high similarity between the source of humic-like and protein-like components and at the same time showed the source of CDOM could be impacted by terrigenous input, also collective effected by coastal currents and water mass movements. HIX and BIX showed inversed distribution, which meant CDOM had higher degree of humification at coastal area, while had higher level of autogenous production at sea side.(3) The PDOM, WEOM and AEOM of Yellow Sea sediment samples and the bottom water samples were respectively established for 4 PARAFAC models. The characterizing of CDOM in bottom water and the PDOM, WEOM and AEOM of sediments showed the wavelengths of components had the trend of red shift and the humus feature were gradually enhanced. The same property components which came from the same model had the similar sources, while there was no significant correlation between the tryptophan components from the different models, which showed the non-coupling between the CDOM of bottom water and PDOM. SOM and WEOM showed a certain degree of correlation. The differences of HIX and BIX between the bottom water, PDOM, WEOM and AEOM reflected the difference level of humification degree and their “freshness”.