Greenland, Antarctica new lands, upheavals

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Re: Greenland, Antarctic new lands, upheavals




by Ahmed » 19/09/18, 21:30

Are we not starting to have "fire in the buttocks" however? It is true, as recently observed Edgar Morin that if many complain about this scorching summer, few see it as a sign of climate change ...
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Re: Greenland, Antarctic new lands, upheavals




by moinsdewatt » 19/09/18, 22:08


NASA sends laser into space to measure ice on Earth

AFP 14 Seven 2018

The US space agency Nasa has planned to launch on Saturday its most advanced laser ever placed in orbit, the ICESat-2, a billion-dollar mission to reveal the extent of melting ice on a land that heats.


The half-ton satellite is to be powered by a Delta II rocket from the US Air Force Vandenberg base in California. The firing window, forty minutes, must open at local 5H46 (12H46 GMT).

This mission is "extraordinarily important for science," Richard Slonaker, head of the ICESat-2 program at NASA, told reporters.

For nearly ten years the agency no longer had an instrument in orbit to measure the thickness of areas covered by ice across the planet.

The previous mission, ICESat, was launched in 2003 and was completed in 2009. Thanks to it, scientists have learned that the pack ice is becoming finer and that the ice-covered surfaces are disappearing from the coastal regions of Greenland and Antarctica.

Since then, surveys have been carried out using an aircraft as part of a mission called Operation IceBridge that flew over the Arctic and Antarctica. "Height measurements and data on the evolution of the ice" have been collected, NASA said.

But an update is urgently needed.

The increasing use of fossil fuels by humanity is resulting in a steady rise in greenhouse gas emissions, which are considered to be the main drivers of climate change.

The average global temperature is increasing year after year, with the hottest four years of modern times being recorded between 2014 and 2017.

The ice sheet is shrinking in the Arctic and Greenland, increasing the phenomenon of rising sea levels threatening hundreds of millions of people in coastal regions around the world

The all-new ICESat-2 is expected to help scientists understand the magnitude of the contribution of ice melt to rising oceans.

- Replacement Laser -

"We will be able to look specifically at how the ice evolves in a single year," noted Tom Wagner, a researcher with the cryosphere (land ice) program at NASA.

Combining these precise records with those collected over the years should give a boost to understanding climate change and improve predictions of sea level rise, he added.

The ICESat-2 is equipped with two lasers --which are a replacement in case - much more advanced than the model on board the previous mission.

Despite its power, the beam will not be hot enough to melt the ice from the orbiting observation post deployed some 500 kilometers above the Earth, noted Nasa.

It will fire 10.000 times per second, as opposed to forty times for its predecessor, which will provide much more detailed data.

Measurements will be taken every 70 centimeters on the trajectory of the satellite.

"The mission will collect enough data to quantify the annual changes in the thickness of the ice cover in Greenland and Antarctica, even if it is only four millimeters," said the US space agency. .

In addition to the thickness and area of ​​the ice cover, the laser will also measure the slope on which it is laid.

"One of the things we're trying to do is figure out the changes that are going on inside the ice, and that's going to improve our understanding of it tremendously, especially in areas where we don't really know. yet how they evolve, ”Wagner explained, citing the great depths of Antarctica as one of those mysterious areas.

The mission is supposed to last three years but the satellite has enough fuel to last for a decade, if its officials decided to extend its life.



https://www.boursorama.com/actualite-ec ... 0c08587b48
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Re: Greenland, Antarctic new lands, upheavals




by moinsdewatt » 03/02/19, 18:48

Canadian Arctic: the summer temperatures of the last century would be the hottest since 115 000 years!

by Damien Altendorf, scientific editor
31 janvier 2019,

New observational data from Baffin Island supports the unusual nature of Arctic warming and retreating glaciers. They make it possible to put the recent evolution in a multi-millennial perspective. It appears that we must go back to the last interglacial to find summer weather conditions comparable to those currently prevailing in the region. This returns about 115 000 years in the past.

......

https://sciencepost.fr/2019/01/arctique ... 5-000-ans/
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Re: Greenland, Antarctic new lands, upheavals




by Grelinette » 04/02/19, 10:57

moinsdewatt wrote:
Canadian Arctic: the summer temperatures of the last century would be the hottest since 115 000 years!

by Damien Altendorf, scientific editor
31 janvier 2019,

New observational data from Baffin Island supports the unusual nature of Arctic warming and retreating glaciers. They make it possible to put the recent evolution in a multi-millennial perspective. It appears that we must go back to the last interglacial to find summer weather conditions comparable to those currently prevailing in the region. This returns about 115 000 years in the past.

......

https://sciencepost.fr/2019/01/arctique ... 5-000-ans/


Greenland, as the name suggests (greenland = green land), will finally return to its original state: more ice but large and beautiful green meadows as far as the eye can see in which will be able to graze many herbivores and ruminants!
It's beautiful when nature finds its rights thanks to the man ... : Cheesy:
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Re: Greenland, Antarctic new lands, upheavals




by sen-no-sen » 04/02/19, 12:03

Grelinette wrote:
Greenland, as the name suggests (greenland = green land), will finally return to its original state: more ice but large and beautiful green meadows as far as the eye can see in which will be able to graze many herbivores and ruminants!
It's beautiful when nature finds its rights thanks to the man ... : Cheesy:


This name of "green earth" actually fits like a pretty publicity stunt.
Indeed to attract settlers (Vikings) the use of the term "green land" was more attractive than the one - already used - ice land (Island).
In fact only a tiny part (south) of Greenland had, in summer, a pretty green color with a boreal type vegetation (lichens, conifers, birches), the rest of the island was covered with a thick cap of ice as it has been since 3 millions of years ago.
The climate-skeptical argument that would make us believe that Greenland was a kind of forest-covered land is a sham.
The formation of the Inlandsis is the result of hundreds of thousands of years of ice accumulation.In addition, the establishment of the Vikings eventually breaks the fragile balance present in the southern areas of the island and ended the colonization.
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Re: Greenland, Antarctic new lands, upheavals




by Ahmed » 04/02/19, 12:52

Absolutely! This advertising coup demonstrates that the manipulation is not a recent invention, even if it has improved dramatically (sic!) ...
The decline of the colony has been particularly studied by Diamond jared in its famous book on the collapse of civilizations: it was kept alive for a time by the external contribution of resources through the export of ivory (walrus), but the appearance of new sources of ivory have ruined this trade and the cultural inability of settlers to adapt their way of life to their environment, the cost of transporting imports, their hostility to the Inuit eventually signified the disappearance of this settlement (while the latter persisted in even more northern).
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Re: Greenland, Antarctic new lands, upheavals




by Grelinette » 04/02/19, 14:09

You are terrible guys!

We are told rather good news of the return of the greenery on this frozen land of Greenland, and in a few lines you show that it is a pipe, and that already in the time of the Vikings, the man had a harmful impact on nature !
It's not nice... : Cry:
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Re: Greenland, Antarctic new lands, upheavals




by Grelinette » 04/02/19, 14:34

As a result of my last comment, I now ask myself the question of whether there is one area for which the intervention of the Man could be beneficial for our planet?

It seems that every time the human hand has set foot somewhere, life has been trampled without scruple!

It's almost philosophical as a question, a sort of universal application of Lavoisier's famous phrase: "Nothing is lost, nothing is created, everything is transformed", and which implies that the ineluctable development of human life since his arrival on earth is inevitably accompanied by the disappearance of another form of life! ...
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Re: Greenland, Antarctic new lands, upheavals




by Ahmed » 04/02/19, 14:58

It is certainly an excessive vision and which would be downright false if it led to putting all societies on an equal footing. A certain number of "primitive" societies, without being perfect (by what criterion?), Could function like other animal species with which these societies interfered and this in a dynamic equilibrium. This is opposed to conclusions that are a little too systematic linking the disappearance of the megafauna and the appearance of man, a vision which suits the point of view of "modern man" who thus clears himself of an alleged predatory human essence. These conclusions derive largely from the small amount of very old data and the imprecision of the dating.

On the other hand, it is clear that our society, like other civilizations *, but in a whole other dimension, is at war with nature and that it has practically won ... But it will be a victory at the Pyrrhus!

PS: I do not believe that the Vikings have impacted their environment so much, simply their way of working was at the limit of the sustainable and it was enough that some parameters evolves unfavorably for the situation to become untenable: in addition to what I have written above, a climate change towards a cooling of temperatures has actually rocked Erik in the red**! : Wink:

* It is necessary to note the distinction that I operate between societies and civilizations, these last ones supposing structures of domination and the spacialization of the power which goes with (opposition between city and campaign).

** Rotten word game on Erik the red who was the initiator of this settlement.
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Re: Greenland, Antarctic new lands, upheavals




by izentrop » 04/02/19, 15:36

Knowledge evolves ...
... during long periods in the Pleistocene (from 2,6 million years to 11 700 years), Greenland was ice-free, according to analyzes carried out on samples of rocks taken from the base of the ice sheet (Lamont-Doherty Earth Observatory, 04 / 2018).
But this was no longer the case in the Middle Ages, even in the middle of the medieval climatic optimum.

... the colony installed by Erik the Red is based on breeding (a social marker) and does not survive the harsh climatic conditions aggravated by the arrival of the Little Ice Age in the 12th century. Sea ice is spreading, preventing ships from docking. Refueling becomes almost impossible. https://www.notre-planete.info/actualit ... erre_verte
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