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Thu, 24 Sep 2020
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Study: Climate change during ice age did not happen at once

Major climatic events during past global ice ages did not occur at once or with the same intensity everywhere, according to new data.

The research by Australian Nuclear Science and Technology Organisation's (ANSTO), which used sophisticated nuclear dating techniques on rocks from Mongolian glaciers, could impact future climate change forecasts.

The research shows that Mongolian glacier advances during the last ice age were not synchronised with alpine glaciers in Europe and North America, suggesting that climate varied significantly between continents.

Hourglass

Danish Arctic research dates Ice Age

The result of a Danish ice drilling project has become the international standard for the termination of the last glacial period. It ended precisely 11,711 years ago.

A Danish ice drilling project has conclusively ended the discussion on the exact date of the end of the last ice age.

The extensive scientific study shows that it was precisely 11,711 years ago - and not the indeterminate figure of 'some' 11,000 years ago - that the ice withdrew, allowing humans and animals free reign.

According to the Niels Bohr Institute (NBI) in Copenhagen, the very precise dating of the end of the last Ice Age has made Denmark the owner of the "Greenwich Mean Time" of the end of the last glacial period and beginning of the present climate - the so-called International Standard Reference.

Target

Cave bears killed by Ice Age, not hunters: study

Giant cave bears froze to death during the last Ice Age in Europe about 28,000 years ago, according to a study on Wednesday that cleared human hunters of driving them to extinction thousands of years later.

The largely vegetarian bears, weighing up to a ton and bigger than modern polar bears or Kodiak bears, apparently died off as a sharp cooling of the climate led to a freeze that killed off the fruits, nuts and plants they ate.

The bears vanished 27,800 years ago, or about 13,000 years earlier than previously believed, the scientists in Austria and Britain said in a study of bear remains using radiocarbon dating including at hibernation sites in the Alps.

"There is little convincing evidence so far of human involvement in extinction of the cave bear," they wrote in the journal Boreas. Some past reports have suggested that the cave bears' demise was linked to over-hunting.

Comment: But don't mention comets.


Frog

Sudden cold weather endangers sea turtles; many being rescued

Jacksonville - Recent cold weather caught sea turtles off-guard before they could reach warmer Gulf Stream waters, and that has led to nearly 25 rescues along the North Carolina coast in the past week.

Karen Beasley Sea Turtle Rescue and Rehabilitation Center on Topsail Island has rescued numerous cold-stunned sea turtles since Thursday, said Jean Beasley, the hospital's executive director.

"We're overwhelmed, this has never happened before -- at least not since the turtle hospital has been in existence," Beasley said. "We had 11 turtles come in last Thursday, 12 on Saturday and six (Sunday). We're frantically trying to make more space."

Igloo

Global warning: We are actually heading towards a new Ice Age, claim scientists

iceage
© The Daily Mail
A taste of the future: Plunging temperatures around Britain created dramatic 2-ft icicles over Sleightholme River in County Durham
It has plagued scientists and politicians for decades, but scientists now say global warming is not the problem.

We are actually heading for the next Ice Age, they claim.

British and Canadian experts warned the big freeze could bury the east of Britain in 6,000ft of ice.

A taste of the future: Plunging temperatures around Britain created dramatic 2-ft icicles over Sleightholme River in County Durham

Most of Scotland, Northern Ireland and England could be covered in 3,000ft-thick ice fields.

The expanses could reach 6,000ft from Aberdeen to Kent - towering above Ben Nevis, Britain's tallest mountain.

And what's more, the experts blame the global change on falling - rather than climbing - levels of greenhouse gases.

Palette

Revealed: The cave paintings which could show how humans survived dramatic climate change during the Ice Age

prehistoric art

Prehistoric find: The caves in northern Spain contain more than 300 images of animals - the largest ever found on the Iberian peninsula
British scientists are set to unlock the secrets of hidden cave paintings which could reveal how humans survived during the changing climate of the Ice Age more than 15,000 years ago.

The paintings, concealed in the caves of northern Spain, will be dated accurately for the first time by experts from the University of Bristol using a new technique based on the radioactive decay of uranium.

A team from the Department of Archaeology and Anthropology has just returned from an expedition to the Cantabria and Asturias regions of Spain, where they removed samples from more than 20 prehistoric painted caves.

Snowman

Ice Age Ivory Carving Discovered in Germany



Ivory Mastodon
©Joself Jelkic/The Epoch Times
The mastodon was found immediately outside the cave during a 2006 dig. The dig continues into 2009; who knows what other treasures might be unearthed.

It was a cool afternoon. A small gathering of people assembled at the Swabian village Stetten ob Lontal, in Germany. They waited for a guided trip to Vogelherd Cave.

It cannot be called a real cave, like one that allows you to descend deeply into the earth and that might feature artfully dripping stalactite and stalagmite sculptures, perhaps like the Charlotte Cave and other natural caves found in the Swabian Alps.

Excursion leader Brigitta Roeck led the group in stages up a soft, rain-soaked footpath. Ms. Roeck gave out snippets of information about climate and vegetation in the Aurignacia of 30,000 years ago.

What were people's days like back then? What did they eat? What thoughts did they have? We have only partial answers to our questions. Our limited knowledge is based on archeological discoveries. Aided by modern carbon-dating techniques, we may arrive at new interpretations.

Bizarro Earth

Upstart Ice Age Theory Gets Attentive But Chilly Hearing

Selling a new gizmo to replace a longtime favorite is always a tough job--especially if few are convinced that the original is broken. Physicist Richard Muller of the University of California, Berkeley, knows what it's like: For several years, he has been pitching a new way to drive the comings and goings of the ice ages. He's trying to displace the cherished Milankovitch mechanism in which cyclical changes in the elliptical shape of Earth's orbit shift the pattern of solar heating, triggering the buildup or melting of ice sheets.

Image
©R. MULLER AND G. MACDONALD
Battling curves. The single cycle of Earth's changing orbital inclination (green) seems a better match to climate (red) than the multiple cycles of orbital eccentricity (blue).

Info

Hot And Cold: Circulation Of Atmosphere Affected Mediterranean Climate During Last Ice Age

A new study published in the scientific journal Science reveals the circulation of the atmosphere over the Mediterranean during the last ice age, 23,000 to 19,000 years ago, and how this affected the local climate.

ice age
©National Oceanography Centre, Southampton
Cold polar air often invaded the Mediterranean region during the last ice age, causing more rain and snow to fall on Mediterranean mountains.

This innovative study paves the way for future interdisciplinary efforts to understand and predict regional climate change, and is co-authored by Professor Eelco Rohling of the University of Southampton School of Ocean and Earth Science, based at the National Oceanography Centre, Southampton.

The Intergovernmental Panel on Climate Change has identified the Mediterranean as a "future climate hot spot" likely to suffer increasingly from severe droughts, heat waves and wildfires, due to global climate change. This is potentially bad news for the many people who now live in the region.

The new work gives important clues about regional rainfall patterns in the past. This will help scientists check computer simulations of the Mediterranean climate, which is essential for predicting and planning for future climate in the region.

Snowman

60 - 80 year "little ice age" coming

An expert from the National Autonomous University of Mexico predicted that in about ten years the Earth will enter a "little ice age" which will last from 60 to 80 years and may be caused by the decrease in solar activity.

Victor Manuel Velasco Herrera, a researcher at the Institute of Geophysics of the UNAM, presented his argument during a conference that teaches at the Centre for Applied Sciences and Technological Development.