In situ production of chromophoric dissolved organic matter in coastal environments

Physics – Optics

Scientific paper

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Oceanography: Biological And Chemical: Organic Marine Chemistry, Oceanography: Biological And Chemical: Biogeochemical Cycles (1615), Oceanography: Biological And Chemical: Optics

Scientific paper

The horizontal and vertical distribution of marine humic-like fluorophore, namely, chromophoric dissolved organic matter (CDOM) fluorescence, was surveyed in Ise Bay, Japan. The distribution patterns of salinity and marine humic-like fluorescence intensity suggested that riverine humic-like fluorophore conservatively distributed along with fresh-sea water mixing in surface water at Ise Bay. However, analysis of mixing behavior of riverine CDOM implied that the 25.1 +/- 10.6% in average of bulk marine humic-like fluorescence intensity of Ise Bay surface waters was derived not from a terrestrial origin but an in situ production. A degradation experiment using natural plankton demonstrated the rapid production of marine humic-like fluorophore within a day. The results consistently suggested that in situ production of marine humic-like fluorophore plays an important role in the dynamics of CDOM in coastal environments.

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