Dead zone scientists use models (numerical representations of real ecosystems) to predict and explore the causes of dead zones. Scientists first draw a diagram of the ecosystem parts they want to model and then embed this ecosystem model in each cell of a large grid for the ecosystem. The example below shows the Chesapeake Bay ecosystem.
Scientists also conduct field experiments to learn about the effects of dead zones on an ecosystem. They collect sediment samples to examine the organisms living inside it and to understand how changes in oxygen affect the release of nutrients and other chemicals from the sediment.
Scientists also conduct laboratory experiments to learn about the effects of hypoxia. We use many different instruments to conduct our research and each instrument has a specific purpose.
Scientists monitor an ecosystem in order to assess how the size of dead zones changes each year. Monitoring also allows scientists to collect data on the causes and effects of dead zones. In the Chesapeake Bay, monitoring stations in Maryland and Virginia waters are visited once or twice each month, and data on oxygen, algae, salinity, and nutrients are collected. In some cases, buoys are deployed to capture short-term changes in oxygen and algae. Using these data, researchers can make plots of oxygen conditions over time to examine how dead zones change over short and long periods.