Question Otzi the iceman and Global Warming

Aug 15, 2020
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This live science article indicates that ice and glaciers in the Alps at around 3300BC may have been very much less than they are today.

Maybe they were even only around the mountain tops

What caused the temperature warming and ice to melt and then expand over the last 12,000 years ?


Just a few hundred years before Ötzi was born, nearby mountains may have been ice-free.

Ötzi died in about 3300 B.C.

The findings suggest that during the Holocene, the epoch covering 11,650 years ago to the present, glaciers in the Alps have changed dramatically.


Ötzi the Iceman, a Copper Age wanderer found mummified in the Alps nearly three decades ago, may have lived at a time when the glaciers were advancing down from the highest peaks to the lower slopes of the mountains.

The ice that preserved Ötzi upon his death in about 3300 B.C. has melted since the mummy was discovered in 1991. But a new analysis of ice only 7.4 miles (12 kilometers) from where Ötzi was found suggests that only the very highest peaks were covered in glaciers until slightly before the iceman's lifetime.

Just a few hundred years before Ötzi was born, nearby mountains may have been ice-free.

The findings suggest that during the Holocene, the epoch covering 11,650 years ago to the present, glaciers in the Alps have changed dramatically.

Related: Mummy melodrama: Top 9 secrets of Ötzi the iceman

"Our main finding is that the ice is 5,900 years old, more or less, which is just a bit older than the iceman," said Pascal Bohleber, who studies glacial ice at the Austrian Academy of Sciences. "This suggests that, in this region, we had a time where glaciers started to form in conditions that were ice-free or with glaciers distinctly smaller than today."
 
Aug 15, 2020
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Climate change researchers the media and others say that humans are changing the planet temperatures as never before in human history.

This is evidenced by glaciers melting we are told in ways never seen before in human history.

This new research published by live science from Austrian glaciers claims to show that glacier coverage in the Alps around 3300 BC was much less than today and may even have hardly existed except at the level of the very highest mountain tops

I assume if this is true this lack of glacier coverage was due to warmer temperatures around 3300BC

Humans did not cause the 3300BC warming, so what did ?

Could the same warming be happening now and why is this data not being discussed by climate change researchers even if to disprove it ?

Is there evidence from elsewhere of similar changes




Will Earth’s Temperature Start Decreasing Over The Next 20,000 Years?

Our axial tilt last reached its maximum value nearly 11,000 years ago, corresponding to the end of our last glacial maximum, with our next minimum approaching in a little under 10,000 years. If natural variations were dominant, we’d expect the next ~20,000 years to favor the growth of ice sheets

 
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Aug 15, 2020
63
2
55

Climate change researchers the media and others say that humans are changing the planet temperatures as never before in human history.

This is evidenced by glaciers melting we are told in ways never seen before in human history.

This new research published by live science from Austrian glaciers claims to show that glacier coverage in the Alps around 3300 BC was much less than today and may even have hardly existed except at the level of the very highest mountain tops

I assume if this is true this lack of glacier coverage was due to warmer temperatures around 3300BC

Humans did not cause the 3300BC warming, so what did ?

Could the same warming be happening now and why is this data not being discussed by climate change researchers even if to disprove it ?

Is there evidence from elsewhere of similar changes




Will Earth’s Temperature Start Decreasing Over The Next 20,000 Years?

Our axial tilt last reached its maximum value nearly 11,000 years ago, corresponding to the end of our last glacial maximum, with our next minimum approaching in a little under 10,000 years. If natural variations were dominant, we’d expect the next ~20,000 years to favor the growth of ice sheets

If anyone has info on this interesting livescience article referred to in the link above it would be good to hear. Thank you
 
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Nov 12, 2020
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I remember that NOVA/PBS made several shows about the discovery and analysis of The Iceman. These maybe currently available for free viewing on kanopy.com via one's local library card. I believe that there was a consensus that Otzi was a trader who was the murdered victim of robbery. If so, the current global warming may uncover other Otzi's in the Alps that met a similar fate.
 
Aug 15, 2020
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Many Alpine summits may have been ice-free before about 5,900 years ago.

Ötzi the Iceman may have scaled ice-free Alps : Read more


Thank you - I found this

View: https://m.youtube.com/watch?v=nk261CZaCKg


You were right Otzi was murdered by an arrow and bled to death.

For now the Otzi find and connected research seems to show that Global Warming had happened prior to or around 3,300 BC to a much greater level than today.

The Otzi related study showed there was little or no ice or glacier cover in Otzi's region before the time he died.

It also seems from the video that whatever cold event happened it was very rapid and so permanent it was enough to flash freeze and preserve Otzi.

Given this and the human population at the time of his death there might not be many more Otzis to find !

More climate change studies around where Otzi lived may help us now understand whats happening today or may happen in the future.
 
Aug 15, 2020
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graph-from-scott-wing-620px.png


Preliminary results from a Smithsonian Institution project led by Scott Wing and Brian Huber, showing Earth's average surface temperature over the past 500 million years.

For most of the time, global temperatures appear to have been too warm (red portions of line) for persistent polar ice caps. The most recent 50 million years are an exception.

Image adapted from Smithsonian National Museum of Natural History.

Geologists and paleontologists have found that, in the last 100 million years, global temperatures have peaked twice. One spike was the Cretaceous Hot Greenhouse roughly 92 million years ago, about 25 million years before Earth’s last dinosaurs went extinct.

Widespread volcanic activity may have boosted atmospheric carbon dioxide. Temperatures were so high that champsosaurs (crocodile-like reptiles) lived as far north as the Canadian Arctic, and warm-temperature forests thrived near the South Pole.

Even while ice sheets covered more and more of Earth’s surface, tectonic plates continued to drift and collide, so volcanic activity also continued.

Volcanoes emit the greenhouse gas carbon dioxide. In our current, mostly ice-free world, the natural weathering of silicate rock by rainfall consumes carbon dioxide over geologic time scales.

During the frigid conditions of the Neoproterozoic, rainfall became rare. With volcanoes churning out carbon dioxide and little or no rainfall to weather rocks and consume the greenhouse gas, temperatures climbed.

What evidence do scientists have that all this actually happened some 700 million years ago?

Some of the best evidence is "cap carbonates" lying directly over Neoproterozoic-age glacial deposits. Cap carbonates—layers of calcium-rich rock such as limestone—only form in warm water.

climateqa_hottest_ocean_temp_610.png

During the PETM, the global mean temperature appears to have risen by as much as 5-8°C (9-14°F) to an average temperature as high as 73°F. (Again, today’s global average is shy of 60°F.)

At roughly the same time, paleoclimate data like fossilized phytoplankton and ocean sediments record a massive release of carbon dioxide into the atmosphere, at least doubling or possibly even quadrupling the background concentrations.

https://www.climate.gov/news-features/climate-qa/whats-hottest-earths-ever-been

Finally interesting video by Nobel Prize winner.

View: https://m.youtube.com/watch?v=LyztWNW2HsM


Lets stop polluting this planet and ourselves with all these plastics and chemical toxins
 
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