Deja Vu For Earth.

TESLATOM · 11-24-2008, 04:48 AM

tt

Mingus · 11-24-2008, 06:45 AM

In addition to that, it seems that there is a record of great volcanic activity going on as well, further adding to the atmospheric change. If I remember the show I'm referencing as well as I think I am.

mich@el · 11-24-2008, 12:07 PM

Another hypothesis involves ocean venting of hydrogen sulfide gas. Portions of deep ocean will periodically lose all of its dissolved oxygen allowing bacteria that live without oxygen to flourish and produce hydrogen sulfide gas. If enough hydrogen sulfide accumulates in an anoxic zone, the gas can rise into the atmosphere.

Oxidizing gases in the atmosphere would destroy the toxic gas, but the hydrogen sulfide would soon consume all of the atmospheric gas available to change it. Hydrogen sulfide levels would increase dramatically over a few hundred years.

Modeling of such an event indicates that the gas would destroy ozone in the upper atmosphere allowing ultraviolet radiation to kill off species that had survived the toxic gas (Kump, et al, 2005). Of course, there are species that can metabolize hydrogen sulfide.

And still another hypothesis builds on the flood basalt eruption theory. Five degrees Celsius would not be enough increase in world temperatures to explain the death of 95% of life. But such warming could slowly raise ocean temperatures until frozen methane reservoirs below the ocean floor near coastlines (a current target for a new energy source) melted, expelling enough methane, among the most potent greenhouse gases, into the atmosphere to raise world temperatures an additional five degrees Celsius. The frozen methane hypothesis helps explain the increase in carbon-12 levels midway into the Permian-Triassic boundary layer. It also helps explain why the first phase of the layer's extinctions was land-based, the second was marine-based (and starting right after the increase in C-12 levels), and the third land-based again.

An even more speculative hypothesis is that intense radiation from a nearby supernova was responsible for the extinctions.

11-24-2008, 04:48 AM	#1
TESLATOM Junior Investigator Join Date: Oct 2008 Posts: 95	Deja Vu For Earth. tt __________________ "The deist God is a physicist to end all physics, the alpha and omega of mathematicians, the apotheosis of designers; a hyper-engineer who set up the laws and constants of the universe, fine tuned them with exquisite precision and foreknowledge, detonated what we would now call the hot big bang theory, retired and was never heard from again." ==========-- Dawkins "I may disapprove of what you say, but I will defend to the death your right to say it." ==========-- Voltaire? Last edited by TESLATOM; 12-15-2009 at 06:03 PM.

11-24-2008, 12:07 PM	#3
mich@el Junior Investigator Join Date: Nov 2008 Location: http://hellhound.org/simplemachinesforum/index.php Posts: 76	Another hypothesis involves ocean venting of hydrogen sulfide gas. Portions of deep ocean will periodically lose all of its dissolved oxygen allowing bacteria that live without oxygen to flourish and produce hydrogen sulfide gas. If enough hydrogen sulfide accumulates in an anoxic zone, the gas can rise into the atmosphere. Oxidizing gases in the atmosphere would destroy the toxic gas, but the hydrogen sulfide would soon consume all of the atmospheric gas available to change it. Hydrogen sulfide levels would increase dramatically over a few hundred years. Modeling of such an event indicates that the gas would destroy ozone in the upper atmosphere allowing ultraviolet radiation to kill off species that had survived the toxic gas (Kump, et al, 2005). Of course, there are species that can metabolize hydrogen sulfide. And still another hypothesis builds on the flood basalt eruption theory. Five degrees Celsius would not be enough increase in world temperatures to explain the death of 95% of life. But such warming could slowly raise ocean temperatures until frozen methane reservoirs below the ocean floor near coastlines (a current target for a new energy source) melted, expelling enough methane, among the most potent greenhouse gases, into the atmosphere to raise world temperatures an additional five degrees Celsius. The frozen methane hypothesis helps explain the increase in carbon-12 levels midway into the Permian-Triassic boundary layer. It also helps explain why the first phase of the layer's extinctions was land-based, the second was marine-based (and starting right after the increase in C-12 levels), and the third land-based again. An even more speculative hypothesis is that intense radiation from a nearby supernova was responsible for the extinctions. __________________ "Not all who wander are lost"

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11-24-2008, 06:45 AM	#2
Mingus Investigator Join Date: Oct 2008 Posts: 325	In addition to that, it seems that there is a record of great volcanic activity going on as well, further adding to the atmospheric change. If I remember the show I'm referencing as well as I think I am.