An interdisciplinary survey was carried out off the Changjiang (Yangtze River) Estuary from August 27 to September 2, 2009. Salinity, temperature, dissolved oxygen (DO), and chlorophyll-a were measured with a CTD (SBE 19 plus) multi-sensor system. The characteristics of DO distribution was affected by the Chlorophyll-a in the surface, and was affected mainly by stratification in the water 10m beneath the surface. The minimum DO recorded in this survey was down to 1.02 mg/L. The area, water thickness and AOU (Apparent Oxygen Utilization) of hypoxia zone was 3735 km~2, 23.6m and 0.49×10~6t respectively. Strong relationship between stratification variable (PEAP) and hypoxia is demonstrated.
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