9:15 AM - 9:30 AM
[MIS06-02] Quantitative and qualitative distribution of fluorescent dissolved organic matter in surface waters throughout the Pacific
Keywords:Marine Dissolved Organic Matter, Fluorescent Dissolved Organic Matter, Oceanic Provinces
In this study, we determined quantity and quality of fluorescent DOM (FDOM) in surface waters throughout the Pacific using excitation and emission matrix (EEM) fluorescence spectroscopy combined with parallel factor analysis (PARAFAC). Surface water samples were collected from the North and South Pacific during four Hakuho-Maru cruises (KH-11-10, KH-12-3, KH-13-7, and KH-14-3 cruises). EEM analysis was performed using FluoroMax-4 (Horiba), and PARAFAC was conducted by the drEEM toolbox on MATLAB (MathWorks). EEM-PARAFAC identified two protein-like components and two humic-like components. We clarified spatial distributions regarding with abundance and composition (i.e., ratio of two components) of humic-like as well as protein-like components. In addition, we used cluster analysis for establishing oceanic provinces from FDOM composition. In the presentation, we will present (1) the meridional differences in FDOM abundance and composition throughout the Pacific, and (2) the similarity/difference between Longhurst’s oceanic provinces and oceanic provinces determined by FDOM composition.