Super volcanoes nuclear winter or fight against global warming?

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moinsdewatt
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Super volcanoes nuclear winter or fight against global warming?




by moinsdewatt » 05/05/16, 12:53

Small list of disasters that you have for the moment escaped

The World 4 May 2016 by Pierre Barthélémy

...........
Other "classics" of this type of catalog: the eruption of a supervolcano (the last, in New Zealand, dates back 26 years) which would project a considerable quantity of particles into the atmosphere - causing the equivalent of a nuclear winter with serious consequences for world cultures -, and .................


http://passeurdesciences.blog.lemonde.f ... t-echappe/

Who in infos on this supervolcan in New Zealand 26 000 years ago?
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Re: Super volcanoes




by Christophe » 05/05/16, 18:12

Owl ! What to fight against global warming: geoengineering climate-change-co2 / geoengineering-cool-the-earth-against-the-warming-t2770.html plans to reject massive doses of sulfur oxide (SO2) to deflect solar radiation at the atmosphere: and volcanoes reject quite a lot of SO2 (depending on the nature of the volcano of course ...)

The wiki page confirms that a single eruption can have a global impact on the Earth: https: //en.wikipedia.org/wiki/Volcanic_Hiver (not necessarily sulfur in this case ...)

1991, eruption of Mount Pinatubo in the Philippines

More recently, the 1991 explosion of Mount Pinatubo, another stratovolcano in the Philippines, cooled global temperatures for two to three years, interrupting the trend of global warming since 1970.
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Re: Super volcanoes: nuclear winter or fight against warming?




by moinsdewatt » 07/05/16, 15:00

moinsdewatt wrote:

Who in infos on this supervolcan in New Zealand 26 000 years ago?


Good, after research:

Taupo Volcanic Zone

The volcanic area of ​​Taupo is a fairly active volcanic area of ​​the North Island of New Zealand. Its name comes from Lake Taupo, the caldera flooded with the largest volcano in the area.

Mount Taupo, which can be called a supervolcan, erupted 26 500 years ago, in the most recent eruption on Earth that reached the highest level on the volcanic explosive index: 8. This eruption, which caused the ejection of more than 1 000 km3 material, is at the origin of the huge caldera that now houses the lake.

The last great eruption of Lake Taupo, of a much smaller amplitude, took place between the end of the second century and the beginning of the third century. It would have emptied the lake, after which a fiery cloud would have spread volcanic ash on about 20 000 km2. More than 120 km3 material was ejected, including 30 km3 in the first minutes. After being placed in the 130 years, the date of this explosion has long been related to ancient evidence of particular weather phenomena over Rome and China (the latter documented in the Book of Later Han) to 1851. These phenomena were explained by the fact that the ashes were abundant enough to affect the color of the sky. The 170 and 180 years are also often mentioned due to a portion of the fourteen carbon dates and the 181 year corresponds to an acidic peak in the ice cores. However, the dendrochronological studies conducted in New Zealand suggest a different dating and place the eruption in the 2302, 3,4 years.

The volcanic area of ​​Taupo extends over 350 km long and measures 50 km wide. It is located above an area of ​​subduction of the Earth's crust.
..................

A recent study indicates that the Earth's crust below the volcanic area of ​​Taupo could be only 16 km thick. A layer of magma 50 km wide and 160 km long lies 10 km deep6,7. Historical geological data indicate that some of the volcanoes in the area erupt very rarely, but violently. There is also a possibility that a rift is being formed in the volcanic area of ​​Taupo.


https://fr.wikipedia.org/wiki/Zone_volcanique_de_Taupo


Geological details:
http://www.earth-of-fire.com/article-su ... 17434.html

Image
Volcanologists Wilson and Bellance examine a cut: at the basal level, pyroclastic deposit of the Oruanui eruption (22.600 years - 1 ° caldeira) - the clear pumice deposits, at the top right, date from the eruption Taupo 1800 Years (2 ° caldeira) - intercalated deposits date from intermediate eruptions. - photo B.Houghton / Wairakei research center.
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Re: Super volcanoes: nuclear winter or fight against warming?




by Christophe » 19/01/22, 12:09

We haven't yet talked about the eruption of the Hunga volcano in Tonga on January 15, 2022...a huge eruption that was felt as far away as Europe by the most accurate weather stations!

On January 15, the Pacific archipelago experienced a volcanic eruption like it only happens once every thousand years. Explanations from the British weekly The Economist.

Why the Hunga volcano eruption in Tonga was so powerful

https://www.courrierinternational.com/a ... -puissante

https://www.economist.com/the-economist ... estructive



Will it provide a few years of respite from global warming???
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Re: Super volcanoes: nuclear winter or fight against warming?




by GuyGadeboisTheBack » 19/01/22, 12:48

Christophe wrote:Will it provide a few years of respite from global warming???

Alas not really, according to the article:
The amount of sulfur that escaped from the Hunga Tonga-Hunga Ha'apai is apparently far too small to cool the climate on a large scale, but its influence on the temperature and dynamics of the Southern Hemisphere stratosphere could be sufficiently important to interest scientists.
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Re: Super volcanoes: nuclear winter or fight against warming?




by Christophe » 19/01/22, 13:07

It all depends on what is meant by "cooling the climate on a large scale"... : Mrgreen:

It's not an eruption that will cancel the warming but perhaps slow down its acceleration!
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Re: Super volcanoes: nuclear winter or fight against warming?




by GuyGadeboisTheBack » 19/01/22, 18:01

Christophe wrote:It all depends on what is meant by "cooling the climate on a large scale"... : Mrgreen:

It's not an eruption that will cancel the warming but perhaps slow down its acceleration!

In any case, if it concerns the southern hemisphere, it could have a positive role in Antarctica.
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Re: Super volcanoes: nuclear winter or fight against warming?




by Christophe » 19/01/22, 18:05

The sulfur dioxide ended up being mixed throughout the atmosphere, no reason for it to be limited to the southern hemisphere...depending on the prevailing winds...

See the NASA CO2 animations: science-and-technology / the-eyes-of-nasa-t17028.html
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Re: Super volcanoes: nuclear winter or fight against warming?




by GuyGadeboisTheBack » 19/01/22, 18:10

Christophe wrote:The sulfur dioxide ended up being mixed throughout the atmosphere, no reason for it to be limited to the southern hemisphere...depending on the prevailing winds...

See the NASA CO2 animations: science-and-technology / the-eyes-of-nasa-t17028.html

Uh, look, I'm basing this on what I read in the article you posted. No more, huh. And then, it is mainly the particles (it seems to me) that cool the atmosphere, since they disturb the penetration (ouh!) of the sun's rays.
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Re: Super volcanoes: nuclear winter or fight against warming?




by Christophe » 19/01/22, 18:29

Oh but I'm not subscribed... : Mrgreen:
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