Greenland, Antarctica new lands, upheavals
Re: Greenland, Antarctic new lands, upheavals
Please provide the factual details that I was too lazy to look for ...
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Re: Greenland, Antarctic new lands, upheavals
There must be a blunder in asserting the "ice-free" period.
In fact, the oldest ice extracted dates back over 100 years, the hypothesis of a Greenland without ice between 000 million years and 2,6 years seems highly doubtful (typo?).
http://www.insu.cnrs.fr/environnement/climats-du-passe/une-carotte-de-glace-du-groenland-revele-l-histoire-climatique-detail
In fact, the oldest ice extracted dates back over 100 years, the hypothesis of a Greenland without ice between 000 million years and 2,6 years seems highly doubtful (typo?).
This is why a new international coring coordinated by Denmark was carried out at the North GRIP site, between 1996 and July 2003, also located on the central plateau of Greenland. First performance: it is the deepest (3085m) and the “oldest” Greenlandic borehole: the recording covers approximately the last 125 years. It reveals that before the last ice age, which began 115 years ago, the Greenlandic climate was warm (interglacial period) and stable, without abrupt variations, thus confirming that the rapid variations observed in the core of GRIP n ' were not climatic in nature but due to an artifact from the flow of ice. The NGRIP carrot provides a very detailed climate record. Thus each centimeter of carrot represents a year for the deep ice which recorded the entry into glaciation. Important, because we learn that the transition to ice conditions was first done gradually over 000 years. And then a first abrupt climatic event occurred around 7 years ago, marking the beginning of the ice age.
http://www.insu.cnrs.fr/environnement/climats-du-passe/une-carotte-de-glace-du-groenland-revele-l-histoire-climatique-detail
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Re: Greenland, Antarctic new lands, upheavals
You're right, the Greenland ice cap started 2.9 Ma ago and accelerated 2.6 My ago and only extended until recently.
, according to this study https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6232173/
, according to this study https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6232173/
An international team (1) has just succeeded in establishing in which way the very close relations existing between the evolutions of the climate and those of atmospheric CO2 led to the freezing of Greenland at the limit of the Tertiary and the Quaternary between 3 and 2,5, 30 million years. In particular, it demonstrated how, XNUMX million years after the development of the Antarctic ice cap, favorable climatic conditions in the northern hemisphere led to the establishment of a perennial ice cap in Greenland. http://www.insu.cnrs.fr/node/9690
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Re: Greenland, Antarctic new lands, upheavals
Hunting, Fishing and Climate Change: The Everyday Life of Alaska Natives
AFP • 03 / 05 / 2019
A few years ago, Willard Church Jr. sometimes had to dig more than a meter into the ice until the end of April to be able to fish in the Kanektok River, which flows near his home in Quinhagak, Alaska.
But for some time now, the river has barely been frozen in the spring, a very tangible sign of global warming which is affecting the American state and forcing its inhabitants, for many native people living on the resources of nature, to change their way of traditional life.
"I spent my whole life following this mode of subsistence (...), with ten-day hunting and fishing expeditions in the mountains", explained Mr. Church, a 55-year-old Eskimo Yupik, in recently visited AFP his small village of 700 inhabitants, lost between the Bering Sea and Kuskokwim Bay.
"We grew up at a time when winter was a real winter, when our elders remembered snowdrifts as high as the roofs of houses. Today, we feel happy if we even have 1,5 cm of snow. on the ground, "he laments.
Alaska Natives - around 120.000 people in 230 rural communities and a few small regional cities - find themselves at the heart of a climate crisis that is shaking up their ancestral habits.
Alaska, like the rest of the Arctic, is warming twice as fast as the global average, scientists say, and temperatures in February and March again beat records for mild weather this year.
- Breakup -
For Mr. Church and his community, the disappearance of ice and snow has serious consequences, with a direct impact on food sources and daily life.
The Kuskokwim River in full ice on April 12, 2019, near the village of Quinhagak, Alaska (AFP / Mark RALSTON)
The frozen watercourses which ordinarily serve as roads in winter and in spring, linking the villages together and allowing the movement of goods, are now experiencing an early debacle.
In this year alone, at least five people, including a villager from Quinhagak, died when their snowmobile or all-terrain vehicle passed through too thin a layer of ice.
"Right now, it should be covered in snow, and we should move around using tracked vehicles," said Warren Jones, manager of Quinhagak, observing the wet and spongy tundra surrounding the village.
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https://www.boursorama.com/actualite-ec ... ccec6e3ec2
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Re: Greenland, Antarctic new lands, upheavals
http://nsidc.org/data/seaice_index/imag ... series.png
beginning of August I feared the worst for the minimun of arctic extension, but ultimately not.
beginning of August I feared the worst for the minimun of arctic extension, but ultimately not.
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Re: Greenland, Antarctic new lands, upheavals
It's fun: Science deepens its work of studies and research on the past so much that we are refining our knowledge of millions of years past ... and we are unable to say what will happen in the past. next few decades!
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Re: Greenland, Antarctic new lands, upheavals
Grelinette wrote:It's fun: Science deepens its work of studies and research on the past so much that we are refining our knowledge of millions of years past ... and we are unable to say what will happen in the past. next few decades!
The past has already happened so it is easier, the future remains uncertain, but the deepening of our past knowledge allows us to better understand it.
Global warming and the various models that are on offer give us already a very unpleasant topo of the future: shortages, disasters of all kinds, political unrest, famine, epidemic etc ...
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Re: Greenland, Antarctic new lands, upheavals
Global warming as we perceive it is indeed a memetic complex.
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"By definition the cause is the product of the effect". (Tryphion)
"360 / 000 / 0,5 is 100 million and not 72 million" (AVC)
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Re: Greenland, Antarctic new lands, upheavals
GuyGadebois wrote:Global warming as we perceive it is indeed a memetic complex.
A beginning of Alzheimer's Guy?
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"Engineering is sometimes about knowing when to stop" Charles De Gaulle.
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