#larsen c

[uel2019s1]

Le changement du climat vu par le numérique.

Larsen C, est une oeuvre de BARTHÉLEMY ANTOINE-LŒFF, un jeune artiste, plasticien qui allie des créations d’œuvres d’art optique qui sont souvent interactives et immersives.

 Larsen C installation, 2017 Juillet 2017 https://ibal.tv/larsen-C

Larsen C, est une création inspirée par le changement climatique vaste de 5 800 km2 similaire à la surface d’un département, il symbolise l’impact des hommes sur notre planète La maquette est posée sur un écran d’ordinateur.

“Cet événement est le symbole d’une évolution irréversible du climat vers un réchauffement global de plus en plus incontrôlable.” (Barthélemy ANTOINE-LOEFF)

Plus qu’une œuvre numérique Larsen C, est un engagement écologique qui nous aide a nous rendre compte de la fragilité de notre environnement, en effet, la barrière de Larsen est une barrière de glace du nord-ouest de la mer de Weddell, elle est constituée d’une série en comptant trois qui occupent des baies distinctes le long de la côte, appelés Larsen A, B et C, la C étant la plus grande et qui disparaît de jour en jour. En 2017 Larsen C a relâché un iceberg 5 800 kilomètres carrés. On peut supposer que la position de la maquette sur un écran, connote le fait que le numérique en général est responsable des changements climatiques, en effet « le web pollue » quand on sait que chaque recherche que nous effectuons produit 0.01 kg et que en moyenne le moteur de recherche « Google » répond à 47.000 demandes par seconde, ce qui représente une quantité estimée à 500 kg de CO2 par seconde, ces chiffres prête aux réflexions.

https://www.climato-realistes.fr/larsen-c-a-relache-un-iceberg-5-800-kilometres-carres/

Fissure de la banquise Larsen C, continue d’augmenter.

https://www.sciencenews.org/blog/science-ticker/antarctica-larsen-c-ice-shelf-cracking

L’artiste nous démontre la transformation de notre planète dont l’homme est la principale cause. Afin de montrer l’intensité du réchauffement climatique, l’artiste décide de laisser la lumière de l’écran partiellement éteinte de sorte à crée un espace vide de pixels morts, et « marquer » cette disparition (fonte des glace).

“En s’inspirant de cet épisode géo-climatique sans précédent, Larsen donne à voir la fragilité de notre environnement (et la nôtre) dans une création artistique originale, une fissure ironique dans le tissu de la réalité, réalisée avec du papier et un écran détourné. (Maxence GRUGIER)“

Le papier calque, principale matériel aidant à représenter la texture de la glace et a laisser passer la lumière à travers.

Nos sources:

https://fr.metrotime.be/2018/05/08/actualite/decouvrez-la-consommation-de-co2-de-google-en-temps-reel/

https://ibal.tv/larsen-C

http://www.siana.eu/wp-content/uploads/2014/12/Barthe%CC%81le%CC%81my-Antoine-Loeff.pdf

https://ibal.tv/

https://fr.wikipedia.org/wiki/Barri%C3%A8re_de_Larsen

FURIA Sonia

RANDRIA Laurène

[ultimavoce]

Antartide: la strana e bellissima vita che si nasconde nelle sue gelide profondità

Il viaggio in questo mondo antartico sommerso potrà aiutare a capire come si è sviluppata ed evoluta la vita in un ambiente rimasto nell’oscurità. Per migliaia di anni. E come questo ecosistema si sia adattato ai cambiamenti climatici.

Esplorare la vita sottomarina in Antartide rimasta incontaminata per 100.000 anni, fino al crollo della piattaforma di ghiaccio Larsen C avvenuto nel 2017. Il viaggio in questo mondo antartico sommerso potrà aiutare a capire come si è sviluppata ed evoluta la vita in un ambiente rimasto nell’oscurità. Per migliaia di anni. E come questo ecosistema si sia adattato ai cambiamenti climatici.

Nel…

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[sciencenewsforstudents]

Warm, dry winds may be straining Antarctica’s Larsen C ice shelf

Wind-induced melting that occurred during the Antarctic autumn may be accelerating the Larsen C ice shelf’s collapse, which could raise sea levels.

Turquoise pools of snowmelt on the Antarctic Peninsula, including on the Larsen C ice shelf, have recently been forming months after the continent’s peak summer melt. Bursts of warm, dry wind cascading over mountains that run along the peninsula are largely to blame, researchers report April 11 in Geophysical Research Letters. In this March 2016 satellite image, meltwater on part of Larsen C can be seen at the foothills of these mountains, just one case of this type of wind-induced melting.

Eastward-flowing winds sweeping across the Antarctic Peninsula sometimes pick up enough speed to surmount its mountain peaks. As the air rises and chills, its moisture condenses and, in the process, reheats the air. So when the now-dry air comes coursing down the leeway mountainside, it can be a balmy 20° Celsius.

Researchers “have told me they’ve been in a T-shirt” while standing in these winds, says cryospheric scientist Tri Datta of NASA Goddard Space Flight Center in Greenbelt, Md.

LOSING ICE: A map of Antarctica shows where warm winds caused unusually late snowmelt on Antarctica’s Larsen C ice shelf from 2015 to 2017. CREDIT: RIDVAN EFE/SHUTTERSTOCK, ADAPTED BY E. OTWELL

Datta and her team compared satellite data collected from 1982 to 2017 with simulations of the peninsula’s ice sheet and atmospheric conditions during the same period. The team found that, since 2015, these winds called foehns have caused a lot of melting on the peninsula, including on Larsen C, as late as May, well into Antarctica’s autumn. Foehns likely cause 60 percent of the total snowmelt on the northeastern part of the peninsula at that time of year, Datta says.

That’s a problem because meltwater can trickle into crevasses on Larsen C. The water’s own weight wedges the cracks open and may help cause the ice shelf to break off. Late melting can also prevent new snow from replenishing the ice shelf. In 2017, a giant iceberg broke from Larsen C, raising questions about the shelf’s stability and how it may contribute to rising seas (SN: 8/5/17, p. 6).

It’s still unclear what’s driving these foehns and if they’re linked to climate change. And Datta emphasizes that three years is too short to constitute a trend. But without Larsen C, which buttresses multiple glaciers, glacial ice flow to the ocean could accelerate and contribute to rising global sea levels.

[sciencenewsforstudents]

An Antarctic expedition will search for what lived under the Larsen C ice shelf

The fourth attempt to investigate the seafloor once hidden by the Larsen C iceberg may have the best chance yet of success.

Maybe the fourth time’s the charm. On February 9, an international team of scientists is embarking on yet another mission to hunt for ocean life that may have once dwelled in the shadow of a giant iceberg (SN Online: 10/13/17).  The scientists, led by researchers at the Alfred Wegener Institute in Bremerhaven, Germany, are headed to the Larsen C ice shelf on the Antarctic Peninsula, where a Delaware-sized iceberg broke off a year and a half ago.

Three previous expeditions have set a course for the ice shelf since the big break in July 2017 (SN: 8/5/17, p. 6). To reach the site, ships must navigate through sea ice drifting in the Weddell Sea, which lies between the Antarctic Peninsula and the main continent. There’s a narrow time window when the sea ice is at its sparsest: just after the Southern Hemisphere’s midsummer, from February into March.

But good timing isn’t a guarantee of success. Two previous missions, a British Antarctic Survey–led expedition in February 2018 and a Korea Polar Research Institute mission in March 2018, were stymied by thick sea ice blocking their way through the Weddell Sea (SN Online: 3/3/18). A third, led by scientists at the Scott Polar Research Institute in Cambridge, England, reached the shelf in late January 2019, but strong winds and dangerous ice floes ultimately forced the team to move on to focus on its primary (and still ongoing) mission — to find polar explorer Ernest Shackleton’s ship Endurance, which sank in the Weddell Sea in 1915.

This latest team will be traveling aboard the Alfred Wegener Institute’s icebreaker Polarstern, the most powerful ship yet to make the attempt. Polarstern’s reinforced hull means that the ship can withstand greater battering from sea ice, and can linger longer in the area until the waters begin to freeze — roughly at the end of March.

ICY HAZARD

Moreover, the berg that broke off from Larsen C, now dubbed A68, also has finally moved out of the way, fully exposing the seafloor that it once shadowed. That also reduces the risks: With the iceberg still looming nearby, last year’s expeditions were in danger of being crushed by it, or rocked by large waves generated by falling ice chunks.

“I’m confident that if anyone’s going to get there, it’ll be this mission,” says Huw Griffiths, a marine biologist with the British Antarctic Survey in Cambridge, England, who will lead the marine biology portion of the expedition.

Science News talked with Griffiths about what he hopes to find lurking on the seafloor. His responses have been edited for length and clarity.

[earthstory]

Strange icebergs

NASA’s annual endeavour called Operation Icebridge that keeps tabs on the changing cryosphere in our fast warming world often brings sightings of odd and interesting features in the world’s frozen regions (see https://bit.ly/2qQefLx). The latest crop features a couple of interesting rectangular tablets of ice spotted in mid October in the sea washing the northern Antarctic Peninsula (the bit that juts out towards the tip of South America), just off the Larsen C ice shelf that the flight from Punta Arenas in Chile had set out to monitor (see https://bit.ly/2Q6TNV2). The operation’s deployment for this year ends tomorrow. Another interesting iceberg makes a telling point about the fate of the world’s ice (when there last was this much CO2 in our atmosphere there was no frozen water to be found anywhere on the planet’s surface). Part of the remnants of a huge calving event 18 years ago in the Ross ice shelf (also in Antarctica) it is shaped like a coffin, describing metaphorically the now near inevitable fate of the world’s cryosphere. Having spent years refining its shape as it circled the White Continent in the Circumpolar Current, B-15T as it is known has now shifted north into warmer waters, where it will melt away. The photo with the layer of cloud above it was taken from the International Space Station.

Loz

Image credit: NASA 2: NASA/Jeremy Harbeck

https://bit.ly/2TeqtL2 https://go.nasa.gov/2DjuGrr

[fishstickmonkey]

(via A Birdseye View of Iceberg A-68A : Image of the Day)

[elvestuarioadecuado]

<strong>Operation IceBridge View of Larcen C <a href="https://www.flickr.com/photos/gsfc/">por NASA Goddard Space Flight Center</a></strong> <br /><i>Por Flickr:</i> <br />This is an photograph from the Oct. 31, 2017 Operation IceBridge flight over the Larsen C.

For the last nine years, NASA’s Operation IceBridge has been flying over Antarctica to measure changes in land and sea ice at the bottom of the world. Soon after beginning this year’s campaign, the mission flew over one of the most obvious signs of change in 2017: a giant iceberg the size of Delaware that recently calved off of the Larsen C ice shelf. This iceberg is more than 600 feet thick and has a total volume twice the size of Lake Erie. Even so, it won’t contribute any more to sea level rise, as it’s been floating as part of an ice shelf for a long time. Scientists are still researching whether the removal off all that ice will have any effect on the flow rates of glaciers upstream from the Larsen C.

Caption: Mountains bordering Crane Glacier. Credit NASA/Nathan Kurtz

More about NASA’s Operation IceBridge: www.nasa.gov/mission_pages/icebridge/index.html

NASA image use policy.

NASA Goddard Space Flight Center enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission.

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THE ALLURE OF ANTARCTICA

THE ALLURE OF ANTARCTICA

WIKILEAKS EMAIL CONTAINS ANTARCTICA PICTURE

James Munder

  References for your convenience:

WikiLeaks:  https://wikileaks.org/podesta-emails/emailid/15503

Antarctica Cruise National Geographic’s Orion

Delaware sized ice breaks of Antarctica Larsen C

Project Midas Larsen C

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