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Seasonal Hypoxia in the Bottom Water off the Mississippi River Delta

Department of Oceanography, Texas A&M University, College Station, TX 77843

View larger version (38K): [in a new window]   Fig. 1. Station locations in the hypoxic zone off the Mississippi River

View larger version (21K): [in a new window]   Fig. 2. Conceptual model of sources (arrows into box) and sinks (arrows out of box) of oxygen in the bottom water of the continental shelf off the Mississippi River

View larger version (15K): [in a new window]   Fig. 3. Bottom sediment community total oxygen consumption (SOC) as a function of bottom water temperature (excluding stations with bottom water oxygen less than 50 mmol m-3)

View larger version (16K): [in a new window]   Fig. 4. Bottom sediment community total oxygen consumption (SOC) as a function of bottom water oxygen concentrations (excluding stations with bottom temperature less than 24°C)

View larger version (18K): [in a new window]   Fig. 5. Oxygen concentrations (top, mg O2 L-1) and density (bottom, t) as a function of depth (m) in the water column at (Fig. 1) in May, July, and October, 1991 (modified from Dortch et al., 1994)

View larger version (10K): [in a new window]   Fig. 6. Continuous oxygen probe records made in situ 1 m above bottom at C6A. Data modified from Rabalais et al. (1994). The original data were in mg O2 L-1

View larger version (18K): [in a new window]   Fig. 7. Results of a numerical simulation of sediment oxygen consumption (mmol O2 m-2 h-1) and oxygen concentration for summer conditions with a vertical eddy mixing coefficient of 0.01 cm2 s-1

View larger version (10K): [in a new window]   Fig. 8. Continuous oxygen probe records made in situ 1 m above bottom at C6A. Data modified from Rabalais et al. (1994). The original data were in mg O2 L-1