Base-extracted particulate organic matter Biogeochemistry 1 Changjiang Estuary 1 China 1 Estuaries 1 Fluorescence 1 Fluorescence spectroscopy 1 Large amounts 1 Nearshores 1 Offshore oil well production 1 Offshores 1 Optical analysis 1 Organic carbon 1 Particulate organic matters 1 Pollution 1 Pollution tracing 1 Regression analysis 1 Runoff 1 Turbidity 1 Turbidity maxima 1 Turbidity maximum zone 1 Yangtze Basin 1 Yangtze Estuary 1 anthropogenic effect 1 nearshore environment 1 particulate organic matter 1 river discharge 1 runoff 1 seasonal variation 1 shelf sea 1