Modern Record of Ocean Oxygen Depletion Tracking Ancient Lau/Kozlowskii Extinction Event

Alex Wierbinski's picture

By Alex Wierbinski - Posted on 28 September 2019



Modern Record Tracking Lau/Kozlowskii Extinction Event

Oxygen Depletion in Ancient Oceans Caused Major Mass Extinction,
Florida State University, September 1, 2019.


Lau/Kozlowskii Extinction Event

"...Late in the prehistoric Silurian Period, around 420 million years ago...a devastating mass extinction event wiped 23 percent of all marine animals from the face of the planet."

"...triggered by an all-too-familiar culprit: rapid and widespread depletion of oxygen in the global oceans."

Unknown Cause
"...there was no known, spectacularly destructive event responsible for the Lau/Kozlowskii extinction." No major meteors or volcanoes as the extinction trigger.

Why Important
"This makes it one of the few extinction events that is comparable to the large-scale declines in biodiversity currently happening today, and a valuable window into future climate scenarios,"

Extinction Linked to Declining Ocean O2
"Their multiproxy measurements established a clear connection between the steady creep of deoxygenated waters and the step-wise nature of the extinction event -- its start in communities of deep-water organisms and eventual spread to shallow-water organisms."

Extinction 2-Step
"For the first time, this research provides a mechanism to drive the observed step-wise extinction event, which first coincided with ocean deoxygenation and was followed by more severe and toxic ocean conditions with sulfide in the water column."

Just Like Modern Times
"This is important as our observations of the modern ocean suggest there is significant widespread deoxygenation which may cause greater stresses on organisms that require oxygen, and may be the initial steps towards another marine mass extinction."


Archaeological Climatology
The PETM, Chicxulub, Toarcian Oceanic Anoxic Event (T-OAE)


Bottom Line


Geological Time Scales, US Geo Society.

Geo Time Scales, Wiki.


Related Research
Sea Surface Temperatures and Ocean Oxygen


Sept 2019
Undersea Gases Could Superheat the Planet


June 2019
2019 Dead Zones at Record Size & Expanding


Jan 2019
2018 Sea Surface Temperatures Hottest Ever


Jan 2019
Oceans Warming Even Faster than Previously Thought


Jan 2019
Where Has All the Heat Gone? Into Changing the Circulation of the Deep Blue Sea...


Dec 2018
2018 Ocean Research: O2 Distribution Changing in World’s Oceans


Dec 2018
Arctic Report Card Documents 'Cascading Effects' Of Warming Ocean Temperatures


Aug 2018
Scripps Pier Records Highest Ocean Temperature in its 102-year History


Aug 2018
OCEANS, CHEMISTRY, & CLIMATE: Cooking Up a Toxic Brew


Jan 2018
Climate Change News, 2018, Ocean Effects of Warming Times: Ocean Oxygen Disappearing





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oxygen, depletion, ancient, oceans, ancient oceans, declining, oxygen, depletion, oxygen depletion, mass extinction, Silurian, Lau/Kozlowskii, extinction event


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