The study examined the spatial-temporal distribution of dissolved organic carbon(DOC)in the Daya Bay.The data were collected in four different seasons from December 2010 to November 2011.Seawater samples were collected for DOC determination from 9 sampling stations.DOC concentration was determined by high temperature catalytic oxidation method.The results showed that the surface DOC concentration ranged from 0.953-2.109 mg·L-1,with average concentration 1.369 mg·L-1 higher than that in the open ocean,and it had a typical offshore feature.The horizontal distribution of DOC showed that DOC concentration was high in offshore area(especially the area near Aotou)and low in the north&northwest area of Dalajia.The temporal distribution of DOC showed a trend of summer>autumn>spring>winter.The correlation between DOC and cell density of phytoplankton(or dry weight of zooplankton)was not significant,indicating DOC was not affected by biological activities.It may be related with human activities,hydrodynamics and other factors.
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