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Did an Ancient Volcano Freeze Earth?[74K Years Ago]
ScienceNow ^ | 07 July 2009 | Phil Berardelli

Posted on 07/09/2009 11:19:06 AM PDT by BGHater

One fine day about 74,000 years ago, a giant volcano on Sumatra blew its top. The volcano, named Toba, may have ejected 1000 times more rock and other material than Mount St. Helens in Washington state did in 1980. In the process, it cooled the climate by at least 10°C, causing a global famine. But could the aftermath have been even worse? A new study puts to rest questions about whether Toba plunged Earth into a 1000-year deep freeze and whether an equivalent event today could jump-start a new, millennia-long ice age.

Giant volcanic eruptions such as Toba briefly cause the opposite of global warming. Although eruptions do emit greenhouse gases such as carbon dioxide, volcanoes also spew sulfur dioxide. Combined with water vapor, sulfur dioxide forms sulfate aerosols, which can spread around the globe, blocking solar radiation and chilling the air before becoming acid rain and snow.

Paleoclimate evidence suggests that the Toba eruption, which occurred during the last ice age, emitted lots of sulfur dioxide--vastly more than Mount St. Helens did. The eruption also seems to have coincided with the start of a 1000-year period of even colder temperatures. Some scientists have suggested that Toba caused the deep freeze and that perhaps such an event happening today could bring on a new ice age. But models developed by NASA and the National Center for Atmospheric Research in Boulder, Colorado, argue otherwise.

Researchers led by climatologist Alan Robock of Rutgers University in New Brunswick, New Jersey, ran scenarios that featured eruptions producing up to several times more sulfur dioxide than Toba. The result, published 27 May in the Journal of Geophysical Research—Atmospheres, was a cooler climate that lasted only a few decades. So the 1000-year cold spell was probably part of the natural cycle that has produced more than a dozen ice ages over the past couple of million years.

"The results virtually eliminate mega volcanic eruptions as one of the key drivers of global-scale glaciation," says climatologist Ellen Mosley-Thompson of Ohio State University in Columbus, who was not involved in the study. So, paleoclimatologists should focus on more likely climate coolers, she says, such as changes in ocean circulation or cyclical variations in Earth's orbit around the sun.

Still, if Toba erupted today like it did in the past, the results would be catastrophic. Although the volcano isn't expected to blow its top for thousands of years, Robock and colleagues estimate a megaeruption could lower global temperatures by as much as 17°C for several years, followed by a recovery to normal conditions that could take decades. That would hit the human population with the double whammy of dramatically reduced agricultural production and widespread loss of vegetation, leading to widespread food shortages and starvation.


TOPICS: History
KEYWORDS: catastrophism; creation; evolution; globalcooling; iceage; indonesia; toba; tobabottleneck; volcano; volcanology
A recent, blast from the past. Sorry.

Year Without a Summer

Mount Tambora

1 posted on 07/09/2009 11:19:09 AM PDT by BGHater
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To: SunkenCiv

Catastrophe, not our fault ping


2 posted on 07/09/2009 11:19:42 AM PDT by BGHater (Insanity is voting for Republicans and expecting Conservatism.)
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To: BGHater

Too bad Al Gore and Michael Moore weren’t around 74K years ago!


3 posted on 07/09/2009 11:21:34 AM PDT by BeerLover NYC (ABC, baby now, 123, face surgery, 123, freaky dee, ABC, glad it's you not me!)
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To: BGHater

You know... Indonesia is really beginning to P*ss me Off!!

What is with all their volcanoes being so savagely destructive????

Krakatoa and now Toba and who knows what else!!!!

They need to come to the Big Island on Hawaii to see how nice well raised well behaved volcanoes behave!


4 posted on 07/09/2009 11:25:22 AM PDT by SoftwareEngineer
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To: BGHater
"The results virtually eliminate mega volcanic eruptions as one of the key drivers of global-scale glaciation," says climatologist Ellen Mosley-Thompson of Ohio State University in Columbus, who was not involved in the study. So, paleoclimatologists should focus on more likely climate coolers, she says, such as changes in ocean circulation or cyclical variations in Earth's orbit around the sun.

Still, if Toba erupted today like it did in the past, the results would be catastrophic. Although the volcano isn't expected to blow its top for thousands of years, Robock and colleagues estimate a megaeruption could lower global temperatures by as much as 17°C for several years, followed by a recovery to normal conditions that could take decades. That would hit the human population with the double whammy of dramatically reduced agricultural production and widespread loss of vegetation, leading to widespread food shortages and starvation.

What you won't hear from the media or politicians today is that we're still in an Ice Age and warming should be the least of our concerns.

5 posted on 07/09/2009 11:28:16 AM PDT by Moonman62 (The issue of whether cheap labor makes America great should have been settled by the Civil War.)
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To: BGHater

Can’t be true since the earth is much less than 74,000 years old. /sarcasm


6 posted on 07/09/2009 11:29:31 AM PDT by trumandogz (The Democrats are driving us to Socialism at 100 MPH -The GOP is driving us to Socialism at 97.5 MPH)
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To: BGHater

One of the effects of this volcanic event was the elimination of all but a few thousand humans.


7 posted on 07/09/2009 11:31:37 AM PDT by reg45 (Be calm everyone. The idiot children are in charge!)
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To: SunkenCiv

ping


8 posted on 07/09/2009 11:33:15 AM PDT by Little Bill (NH the Sixth Gay State.)
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To: BGHater

Maybe Al Gore and Obama can build us one of these mo-fos to solve our overheatin’ issues. Yo.


9 posted on 07/09/2009 11:40:17 AM PDT by AbeKrieger (If global warming didn't exist, Al Gore would have had to invent it.)
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To: SunkenCiv
Dam, nevermind, already posted. I hate keyword search.
10 posted on 07/09/2009 11:42:50 AM PDT by BGHater (Insanity is voting for Republicans and expecting Conservatism.)
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To: BGHater

:’) but alas...

Ancient Supervolcano’s Eruption Caused Decade Of Severe Winters
ScienceDaily | July 2, 2009 | Unknown
Posted on 07/03/2009 5:39:20 AM PDT by decimon
http://www.freerepublic.com/focus/chat/2284760/posts


11 posted on 07/09/2009 1:50:34 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/__Since Jan 3, 2004__Profile updated Monday, January 12, 2009)
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To: 75thOVI; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; Avoiding_Sulla; BBell; ...
Thanks BGHater!
 
Catastrophism
 
· join · view topics · view or post blog · bookmark · post new topic ·
 

12 posted on 07/09/2009 1:51:21 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/__Since Jan 3, 2004__Profile updated Monday, January 12, 2009)
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To: BGHater; blam

A thousand times as much as St. Helens?
Try TEN THOUSAND!!

Global temps crashed like 7-10 degrees Celsius for a thousand years, worldwide, human population is estimated to have fallen to about 5,000 individuals.

Unless I’m mistaken, this was the largest supervolcano event in like the last 500,000 years or so.

This is one of Blam’s faves, ask him about it.


13 posted on 07/09/2009 1:55:43 PM PDT by djf (Go tell everybody its calm before the storm Can you hear the distant thunder baby....)
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To: djf; BGHater
Late Pleostocene Human Population Bottlenecks. . . (Toba)

Amazingly, the Hobbits on nearby Flores Island survived this catastrophe.

14 posted on 07/09/2009 2:07:00 PM PDT by blam
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To: BGHater
The Toba caldera.


15 posted on 07/09/2009 2:07:38 PM PDT by djf (Go tell everybody its calm before the storm Can you hear the distant thunder baby....)
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To: SunkenCiv; blam

So why don’t you guys fight it out about the truth of the ‘Toba bottleneck’, and get back to the rest of us.


16 posted on 07/09/2009 4:55:37 PM PDT by Lucius Cornelius Sulla ("men of intemperate minds cannot be free. Their passions forge their fetters." -- Edmund Burke)
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To: Lucius Cornelius Sulla
"So why don’t you guys fight it out about the truth of the ‘Toba bottleneck’, and get back to the rest of us."

We were hoping you'd contribute something.

17 posted on 07/09/2009 5:37:12 PM PDT by blam
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To: Lucius Cornelius Sulla; blam; SunkenCiv
So why don’t you guys fight it out about the truth of the ‘Toba bottleneck’, and get back to the rest of us.

I don't mean to butt in here, but I will.

As one who has become increasingly suspicious, even cynical of output from the Scientific Community™, I suspect much of the snipe hunting by the Scientific Community™ is nothing more than an effort to keep the grant moneys flowing, primarily from Uncle Sugar. Consider there apparently has not been a concensus reached on something that happened in our own back yard ~12,000 years ago, that is, the extinction of the Northern Hemisphere's megafauna, along with a goodly number of humans probably, at least in North America. And this happened like, yesterday! The upshot I suppose is once concensus is reached the research dollars likely fall off to a trickle. Of course the proper concensus must be reached or the funds will flow until it happens. Again, call me cynical...

18 posted on 07/09/2009 6:03:34 PM PDT by ForGod'sSake (You have two choices and two choices only: SUBMIT or RESIST. Have I missed anything?)
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To: blam

Not an expert, but what I’ve heard about genetic drift, implying that there was a real shortage of Homo sap. back in those years to be rather convincing, so would be interested in hearing it explained in some other way. Don’t really have an apeman in this fight!


19 posted on 07/09/2009 6:23:35 PM PDT by Lucius Cornelius Sulla ("men of intemperate minds cannot be free. Their passions forge their fetters." -- Edmund Burke)
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To: Lucius Cornelius Sulla
Here is a link to a number of articles that my provide what you're seeking.
20 posted on 07/09/2009 6:30:14 PM PDT by blam
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To: blam

My vague conclusion is that we have too big a theory based on too little evidence. Thay’s OK, I still don’t accept the total extinction of Neanderthal Man, I need lot’s of convincing in these areas.


21 posted on 07/09/2009 6:45:38 PM PDT by Lucius Cornelius Sulla ("men of intemperate minds cannot be free. Their passions forge their fetters." -- Edmund Burke)
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To: Lucius Cornelius Sulla
"That’s OK, I still don’t accept the total extinction of Neanderthal Man..."

Me either...we are Neanderthal.

22 posted on 07/09/2009 8:10:44 PM PDT by blam
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To: Lucius Cornelius Sulla; blam; ForGod'sSake

I’m still hiding up here in this tree, while blam’s dogs are circling down below and barking. ;’)

http://www.freerepublic.com/focus/chat/2284760/posts?page=18#18


23 posted on 07/09/2009 9:01:14 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/__Since Jan 3, 2004__Profile updated Monday, January 12, 2009)
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To: SunkenCiv; blam
I’m still hiding up here in this tree, while blam’s dogs are circling down below and barking.

Har! Aw heck, come on down. You know blam would call his dogs off, right? Right??? Anywah, I'll just back up a little now to give you room to, uh, get down... BTW, did I ever tell you the story about a neighbor of mine years ago got taken down by a boxer. He was probably around 200lb; the boxer I'd guess around 60-70 lbs. Didn't take but a second and that dog was stiff-legged over my neighbor who was flat of his back. Amazing.

24 posted on 07/09/2009 10:13:09 PM PDT by ForGod'sSake (You have two choices and two choices only: SUBMIT or RESIST. Have I missed anything?)
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To: ForGod'sSake
a neighbor of mine years ago got taken down by a boxer
Same here. But we both lived across the street from Joe Frazier, and my neighbor wouldn't turn down his boom box.
25 posted on 07/10/2009 4:59:11 AM PDT by SunkenCiv (https://secure.freerepublic.com/donate/__Since Jan 3, 2004__Profile updated Monday, January 12, 2009)
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To: SunkenCiv
But we both lived across the street from Joe Frazier, and my neighbor wouldn't turn down his boom box.

Har! Our neighbors must have come from the same gene pool. Darwin Award contenders...

26 posted on 07/10/2009 12:25:44 PM PDT by ForGod'sSake (You have two choices and two choices only: SUBMIT or RESIST. Have I missed anything?)
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