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Widespread Ancient Ocean “Dead Zones” Challenged Early Life

Persistent lack of oxygen in Earth’s oceans affected animal evolution

The oceans became oxygen-rich as they are today about 600 million years ago, during Earth’s Late Ediacaran Period. Before that, most scientists believed until recently, the ancient oceans were relatively oxygen-poor for the preceding four billion years. (more…)

Deep Plumes of Oil Could Cause Dead Zones in the Gulf

By Guest PostAugust 21, 20101 commentEnvironmentalistair adcroft, dead zones, deepwater horizon spill, dissolved oil, gulf of mexico, hypoxic zones, methane, methane plumes, national oceanic and atmospheric administration, noaa, ocean hypoxia, oil, oxygen, pollution, princeton university, robert hallberg, simulation, toxic concentrations

WASHINGTON — A new simulation of oil and methane leaked into the Gulf of Mexico suggests that deep hypoxic zones or “dead zones” could form near the source of the pollution.

The research investigates five scenarios of oil and methane plumes at different depths and incorporates an estimated rate of flow from the Deepwater Horizon spill, which released oil and methane gas into the Gulf from April to mid July of this year.

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Tag Archives: dead zones

Widespread Ancient Ocean “Dead Zones” Challenged Early Life

Deep Plumes of Oil Could Cause Dead Zones in the Gulf