Light absorption properties of colored dissolved organic matter (CDOM) in adjacent waters of the Changjiang
Estuary were investigated during the summer of 2013. CDOM absorption showed a substantial portion of the total
absorption and clearly dominant among most investigation stations. It generally decreased from the northwest to the
southeast, which controlled by physical mixing of fresh water and seawater as was indicated by a conservative behaviour
of CDOM. CDOM absorption sharply increased during phytoplankton blooms. Similarly, dissolved organic carbon (DOC)
also peaked during blooms period. However, DOC exhibited a more complex behavior relative to a simple conservative
mixing, possibly attributed to multiple origins of DOC. CDOM absorption and DOC co-varied to some degree, implying
a potential way of DOC estimation from CDOM absorption. However, more detailed information such as CDOM and
DOC composition and more validation data were required to obtain a stable CDOM – DOC pattern. Lastly, empirical
algorithms with limited data were developed to retrieve CDOM absorption. Further validation of the algorithms were
needed when they were to be commonly applied.
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