Permian Extinction Was Beginning Of...

Oct 20, 2012 | Posted by: roboblogger | Full story: RedOrbit

Paleogeographic reconstruction of the Earth before the end-Permian extinction event 252-247 million years ago.

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1 - 6 of 6 Comments Last updated Oct 31, 2012

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

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#1
Oct 22, 2012
 
Nice to see the End permian heat death scenario gaining credence.

Have a nice day: Ag
PHD

Houston, TX

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#2
Oct 22, 2012
 

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It started to be a nice day. No postings of useless babble tainted with ahte covered with spam cut and paste hot air from the dirtling. Yes the day was spoiled from the Less than a Box of Rocks AKA "tina"
Northie

Spokane, WA

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#3
Oct 24, 2012
 

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Previous greenhouse warming nearly extinguished all life for millions of years? That couldn't possibly be relevant to any issues we face today, could it?

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

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#4
Oct 29, 2012
 

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Northie wrote:
Previous greenhouse warming nearly extinguished all life for millions of years? That couldn't possibly be relevant to any issues we face today, could it?
Climate of end Permian time was locked into climate mode#2 by the shape of the supercontinent of Pangaea. The result is that the Earth was unable to circulate its atmosphere in the more efficient and oceanically domminated mode#3 whch was the dominant mode from Triassic to early Tertiary and cooled the earth to below "Heat death" levels.

We currently have a climate model of mode#2 from Jason (last name unknown), as a result of recovery from the last glaciation. We now as a result of continued recovery from the last glaciation are changing to climate mode#3 which is much more dynamic and efficient at cooling the planet than mode#2.

Climate mode#3 will continue until the gulf stream shuts down as a result of major floods in N. Asia debouching fresh water en masse into the Arctic ocean preventing thermohaline descent of cold brine formed from freezing saltwater due to the freezing of a brackish floodwater cap on top.

Climate mode#4 will set in immediately after gulf stream shutdown which is far more efficient and continentally localised than climate mode#3. the result of climate mode4 will be the regrowth of the Laurentide icecap fed from the El Nino hot pool backed up against the pan american land barrier. This will cool thre planet relatively (a few millennia) quiclky. This cooling and icecap formation will result in either the 24th or 26th (not certain which) glacial interval since the start of the Pleistocene geological period about 2.2 million years ago.

The heat death scenario is not a problem @ present, addition of extra heat makes the gulf stream shutdown and next glacial period earlier than it would otherwise be.

I have been unable to contact Jason (last name unknown) whom appears to heve been retired without pension during the regime of George HW Bush and is probably deceased. It appears that his successors have 3 more climate mode models to characterise.
The last being the extremely inefficient climate mode#1 which will kick in once climate mode#4 has drained the oceanic heat out of the El Nino hot pool. At that point the cold equatorial ocean will warm up and the poles under a thich icecap will refrigerate until the equatorial heat builds up enough to trigger another El Nino and outbreak of mode#4 which will plate over the ablating ice caps with fresh snow.

The gulf stream swith on which causes the interglacials only occurs once the polar oceans have cleared out the snowbergs from the Laurentide icecap aloowing thermohaline descent in the N. Atlantic during refrigeration under a spell of climate mode#1. This will take a long time, interglacials are generally around 50,000 to 70,000 years apart, and start off cold so the result is initially a gulf stream fed Fennoscandian icecap which forms as the Laurentide icecap starves and ablates. The last interglacial started 30,000 years ago and it was only counted as an interglacial when the Fennoscandian & Laurentide icecaps finally melted under global warming 10,000 years ago.

Have a nice day: Ag
Northie

Spokane, WA

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#5
Oct 29, 2012
 

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Adrian Godsafe MSc wrote:
<quoted text>
Climate of end Permian time was locked into climate mode#2 by the shape of the supercontinent of Pangaea. The result is that the Earth was unable to circulate its atmosphere in the more efficient and oceanically domminated mode#3 whch was the dominant mode from Triassic to early Tertiary and cooled the earth to below "Heat death" levels.
Currently, the most likely explanation for the End Permian extinction (and at least two other major extinction events) is large-scale flood basalt volcanism, which outgassed enough carbon to cook the climate.

http://siberia.mit.edu/

The difference between then and now is that now we are doing this ourselves.

“Geologist [I'm Climate Change]”

Since: Mar 07

Nuneaton

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#6
Oct 31, 2012
 
Northie wrote:
<quoted text>
Currently, the most likely explanation for the End Permian extinction (and at least two other major extinction events) is large-scale flood basalt volcanism, which outgassed enough carbon to cook the climate.
http://siberia.mit.edu/
The difference between then and now is that now we are doing this ourselves.
Same flood Basalts cooked the planet via CO2 outgassing in the Jurassic & also Cretaceous.

The difference between End Permian and Mid Cretaceous (Ontong Java) and Late Cretaceous (Deccan traps) is that the climate mode change from fixed mode#2 to mobile mode#3 caused by a change in continental configuration allowing the ocean to moderate the climate.

Also note that solar core shrinkage and heating due to stellar evolution as the core runs out of H fuel means that insolation levels were greater in the Jurassic & Cretaceous than end Permian whereas the global temperatures were cooler. Insolation rate NOW is even higher which puts the Pleistocene ice ages into perspective.

There was incidentally significant heating due to outgassing from each basalt plateau event (including the Thulean basalts of early Tertiary) The reason why there was no mass extinction due to heat death in all cases except End Permian is because the climate circulation typically kept the temperatures below the lethal threshold. The Deccan mass extinction had nothing to do with the basalts although (as before) several genera of dinos got cooked. The end Cretaceous mass extinction was due to a bloody great big rock landing on the Chixculub carbonate bank (N. Yucatan) which led to at least 6 months of total darkness which removed 90% of oceanic plankton feeders, and most large animals without a detritivore or "predator of detritivore" lifestyle (such as baby crocodiles)@ the time.

for the record...
mode#1 is very inefficient which heats the equator rapidly and refrigerates the poles. It eventually will become hot enough at the equator to trigger either mode#2 or mode#4 depending on continental configuration @ the time.
mode#2 will heat the planet to above the end Permian heat death levels if it runs continuously without a break. It will eventually trigger mode#3 when the ocean becomes warm enough if it is not fixed by continental configuration.
Mode#3 will run until the global temperature reaches the temperature of the mid Eocene once it becomes warm enough to run. This is the default mode with a global ocean and scattered continents hence it ran continuously from Triassic to early Tertiary, and increases above the norm via global temperature were a result of excess CO2 cro outgassing & volcanism. It is much more efficient at cooling the equator and warming the poles than mode#2
Mode#4 will run in a condition of the correct continental configuration resulting in at least one El Nino hot pool feeding a loop from equator to pole and back. This leads to VERY efficient cooling resulting in a high latitude ice cap developing on a near polar continent. The Gulf stream is the only reason why mode#4 is not running right now. Once all the heat has drained from the El Nino hot pool, mode#4 will switch off and mode#1 will start resulting in a cycle thereafter from mode#4 to mode#1. This has led to 23 or 25 glacial periods since the start Pleistocene with the Gulf stream acting as an on/off switch.

A previous episiode of climate mode#4 ran in the late Proterozoic resulting in 4 global "snowball" epochs of about 50 million years each followed by a CO2 driven meltdown which lasted until weathering removed the CO2 excess and mode#4 removed the heat.

Have a nice day: Ag

ps. Still no sign of Jason.

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