News

Massive 8,000-mile 'dead zone' could be one of the gulf's largest

"JUST OFF THE coast of Louisiana and Texas where the Mississippi River empties, the ocean is dying. The cyclical event known as the dead zone occurs every year, but scientists predict that this year's could be one of the largest in recorded history. Annual spring rains wash the nutrients used in fertilizers and sewage into the Mississippi. That fresh water, less dense than ocean water, sits on top of the ocean, preventing oxygen from mixing through the water column. Eventually those freshwater nutrients can spur a burst of algal growth, which consumes oxygen as the plants decompose. [...]"

Source: National Geographic

Read the full article here.


NOAA forecasts very large ‘dead zone’ for Gulf of Mexico

"NOAA scientists are forecasting this summer’s Gulf of Mexico hypoxic zone or ‘dead zone’ – an area of low to no oxygen that can kill fish and other marine life – to be approximately 7,829 square miles, or roughly the size of Massachusetts. The annual prediction is based on U.S. Geological Survey river flow and nutrient data. [...]"

Source: NOAA

Read the full article here.


An assessment of the predictability of column minimum dissolved oxygen concentrations in Chesapeake Bay using a machine learning model

Abstract.

"Subseasonal to seasonal forecasts have the potential to be a useful tool for managing estuarine fisheries and water quality, and with increasing skill at forecasting conditions at these time scales in the atmosphere and open ocean, skillful forecasts of estuarine salinity, temperature, and biogeochemistry may be possible. In this study, we use a machine learning model to assess the predictability of column minimum dissolved oxygen in Chesapeake Bay at a monthly time scale. [...]"

Source: Estuarine, Coastal and Shelf Science
Authors: Andrew C. Ross, Charles A. Stock
DOI: 10.1016/j.ecss.2019.03.007

Read the full article here.