Les glaces hivernales de l'Arctique au plus bas depuis 38 ans - Le Parisien. Les glaces recouvrant l'océan arctique ont atteint cet hiver leur plus faible étendue en 38 ans, un nouveau signe de l'accélération du réchauffement climatique, selon les scientifiques.La banquise arctique est à sa surface la plus réduite, au plus fort de la saison hivernale, pour la troisième année consécutive depuis le début des mesures effectuées par satellites en 1979, ont indiqué mercredi la Nasa et le Centre américain de la neige et des glaces (NSIDC).Ce n'est pas une surprise puisque 2016 a été l'année la plus chaude jamais enregistrée sur la planète, marquant le troisième record annuel consécutif de chaleur.
Arctic sea ice shrinks to fourth lowest extent on record. Ice coverage in the Arctic this year shrunk to its fourth lowest extent on record, US scientists have announced.
The National Snow and Ice Data Centre (NSIDC) in Boulder, Colorado, said the ice reached a low of 4.41m sq km (1.70m sq miles) on 11 September in what experts said was a clear indicator of climate change. Sea ice melt is closely tied to warmer weather over the region, which can be affected by climate change and short-term weather variability. Arctic sea ice hits another record low. The National Snow and Ice Data Center (NSIDC) reports that a record amount of the Arctic sea never froze this winter.
Ice extent, which usually hits a wintertime maximum around mid-March, was at a record-low for the second year in a row, 5,000 square miles below 2015’s record-low maximum extent. This year’s maximum extent is 431,000 square miles below averages from 1981 to 2010. It’s a pattern that will likely continue, according to NASA Arctic sea scientist Walter Meier. “It is likely that we’re going to keep seeing smaller wintertime maximums in the future because in addition to a warmer atmosphere, the ocean has also warmed up,” Meier said. The amount of sea ice can vary a lot from year to year, but we’re seeing “significant downward trend” from warming conditions, Meier added.
Arctic ice melt sets yet another record. This story was originally published by Slate and is reproduced here as part of the Climate Desk collaboration.
Every year around the end of February, after a long winter, Arctic ice reaches its maximum extent. This year that happened around Feb. 25, when it encompassed 14.54 million square kilometers (5.61 million square miles) of ice around the North Pole. Sound like a lot? It’s not. Really, really not. The plot above shows the situation. The dashed line was the extent in 2012, when unusual conditions created the lowest minimum extent in recorded history.
We have to be careful here, because individual records can be misleading. 35 years of shrinking arctic ice, all in one graphic. The melting of the Arctic has been so gradual and far-off it’s hard to comprehend the huge amount of ice that has vanished.
But with this NASA visualization, seeing the disintegration of the polar region is as easy as reading an eye chart with 20/20 vision. The graphic shows Arctic sea-ice extent for most months dating back to the late 1970s, based on images from the National Snow and Ice Data Center. Years run across the top, months are plotted downward. Arctic Ice Melt Could Mean More Extreme Winters For U.S. And Europe. From Climate Central: The record loss of Arctic sea ice this summer will echo throughout the weather patterns affecting the U.S. and Europe this winter, climate scientists said on Wednesday, since added heat in the Arctic influences the jet stream and may make extreme weather and climate events more likely.
The “astounding” loss of sea ice this year is adding a huge amount of heat to the Arctic Ocean and the atmosphere, said Jennifer Francis, an atmospheric scientist at Rutgers University in New Jersey. Arctic Sea Ice Shrinks to Smallest Extent Ever Recorded. This story first appeared on the Guardian website and is reproduced here as part of the Climate Desk collaboration.
Sea ice in the Arctic has shrunk to its smallest extent ever recorded, smashing the previous record minimum and prompting warnings of accelerated climate change. Satellite images show that the rapid summer melt has reduced the area of frozen sea to less than 3.5 million square kilometers this week—less than half the area typically occupied four decades ago. Arctic sea ice cover has been shrinking since the 1970s when it averaged around 8 million square kilometers a year, but such a dramatic collapse in ice cover in one year is highly unusual. A record low in 2007 of 4.17 million square kilometers was broken on August 27, 2012; further melting has since amounted to more than 500,000 square kilometers. Sea ice in the Arctic has shrunk to its smallest area ever, and shrinking is continuing. The area of floating sea ice in the Arctic has fallen to its lowest size ever observed, researchers said Monday.
Moreover, the ice is still shrinking and is not expected to reach its minimum until sometime in September. The average shrinkage of the ice has been increasing steadily since 2007, and researchers attribute the loss to global warming, which is causing warmer temperatures in the region. On Monday, the extent of the Arctic sea ice was 1.58 million miles, which is 27,000 square miles below the previous record set on Sept. 18, 2007, according to researchers from the University of Colorado's National Snow and Ice Data Center. That is about 1 million square miles lower than the average minimum extent observed between 1979 and 2000 -- an area about the size of Alaska and Texas combined. La banquise révélée par le satellite Cryosat. La sonde européenne donne une estimation précise du recul de la glace près des pôles.
Lancée le 8 avril 2010 depuis la base de Baïkonour (Kazakhstan), cette petite sonde de 720 kilogrammes est capable de mesurer l'épaisseur de la glace de mer avec une précision inégalée comprise entre 1 et 3 centimètres grâce à l'altimètre radar Siral, conçu et fabriqué par le groupe franco-italien Thales Alenia Space. Cryosat révèle une fonte massive de la banquise. Selon les mesures effectuées par le satellite européen Cryosat, le volume de la banquise arctique a chuté de 36 % en automne au cours des neuf dernières années.
Arctic Sea Ice Levels Hit Record Low, Scientists Say We're 'Running Out Of Time' La banquise arctique pourrait complètement disparaître d'ici à quatre ans. La fonte des glaces de mer du pôle Nord s'accélère au point qu'elles pourraient avoir totalement disparu, en été, entre 2015 et 2016, selon Peter Wadhams, de l'université de Cambridge. Humans Cause 70 Percent of Loss of Arctic Sea Ice (Video) A just-published study in the journal Environmental Research Letters has found that, based on computer modeling, at least 70 percent of “radical decline” in sea ice around the Arctic is caused by “human-induced climate change.”
In fact, as much as 95 percent of the loss of arctic sea ice could be due to human factors. The decline in the sea ice could be cataclysmic for wildlife. It could further endanger arctic ecosystems as, with far less sea ice, new northern sea routes could be open and greater areas of the sea bed made accessible for drilling for oil and gas. The sea ice has been shrinking at a faster rate since the 1990s. La banquise prend l'eau. Fonte record de la banquise arctique en 2012. La banquise arctique a fondu à une vitesse record en 2012, « un signe inquiétant du changement climatique », selon l'Organisation météorologique mondiale.
L'année 2012 se classe parmi les dix années les plus chaudes jamais observées depuis les premiers relevés de températures effectués en 1850, a confirmé jeudi l'OMM (Organisation météorologique mondiale). Mais, pour l'agence de l'ONU, le fait climatique le plus significatif de l'année écoulée est sans conteste la «fonte record» de la banquise arctique. À la mi-septembre, elle a atteint «le niveau le plus bas de son cycle annuel, avec 3,41 millions de kilomètres carrés», précise-t-elle. Soit une superficie inférieure de 18 % au précédent minimum, en 2007, qui, à l'époque, était également un record. Conséquences de la fonte des glaces - CLIMAT, Une enquête aux pôles - CNRS - sagascience : L’Arctique fond, fond, fond et bouleverse le climat. La banque Arctique se forme sur l’océan. En fondant, elle laisse à place à la surface de l’océan qui absorbe davantage les rayons solaires et amplifie le réchauffement © NASA La banquise a une influence climatique.
En cause ? Principalement son fort albédo, pourcentage de lumière qu’elle réfléchit par rapport à celle qu’elle reçoit, comparé à celui d’une couche fine de glace et celui d’un océan libre de glace. Hiver froid : la faute à la banquise arctique. These are dark days for the Arctic — literally. Things are getting gloomy up north, where the Arctic region is losing its albedo. No, not libido — this isn’t a problem that can be fixed with ice-blue pills and adventurous nature videos. Albedo. It’s a scientific term that refers to the amount of light that the surface of the planet reflects back into space. Reflecting light away from the Earth helps keep things cool, so the loss of Arctic albedo is a major problem.
Arctic ice grows darker and less reflective - environment - 05 August 2013. Arctic ice is losing its reflective sheen. Charctic Interactive Sea Ice Graph. Ice going, humanity: Arctic melting at alarming rates. It’s no surprise to regular readers I am quite concerned about climate change. My concern on this issue is twofold: One consists of the actual global consequences of the reality of global warming, and the other is the blatant manipulation of that reality by those who would deny it. Under Arctic Ice, Photographer Captures Climate Shifts In Earth's Most Rapidly Changing Place. What does the future hold for the parts of the world that will be most affected by Earth's warming climate? This spring and summer, St. Louis-based photojournalist Randall Hyman spent four months getting a preview in Arctic Norway, a place he's visited again and again since the mid-1970s.
What struck him most on this trip, a Fulbright Scholarship project between April and August, was a pace of change that "has really picked up in the last decade," Hyman said, since trips he made there in 2006 and 2007. "In that short space, less than a decade, right away I'm seeing differences like where the fisheries are richest, which ones are thriving and which ones are dying off," he added. Help! An Iceberg the Size of Singapore Just Broke Off in Antarctica. As yet more proof of the disturbing effects of global warming, a massive chunk of ice, estimated at 22 miles by 12 miles, has broken off of the continent of Antarctica. We already know that during 2012, the Arctic broke several climate records, including a level of unprecedented warmth that created rapid ice loss.
The National Oceanic and Atmospheric Administration (NOAA) warned in its “The State of the Climate in 2012“ report that last year was one of the 10 hottest years since the beginning of recording global average temperatures. As a result, it seems that the North Pole is turning into the North Pool.Now it seems that the South Pole is just as much at risk thanks to climate change. The Singapore-sized chunk of ice broke off from Pine Island Glacier in Western Antarctica. Scientists originally noticed a crack forming in October 2011, so it has taken two years for the iceberg, known as B-31, to finally move away from the coast. Looks like the Arctic has been heating up even faster than we thought. Exhaustive efforts to calculate temperatures around the world based on satellite and weather station data may have missed a spot: the Arctic. The area around the North Pole is warming faster than anywhere else in the world, but there’s been a shortage of temperature data from the region.
New research suggests that efforts to fill in those data gaps over the last 16 years using calculations and assumptions have underestimated the rate at which temperatures are rising. That could help to explain why the apparent increases in global temperatures have been slightly lower than forecast by climate models — and slightly lower than had been the case before 1997. One problem is that satellites orbiting the Earth can’t get a good view on the poles, so temperatures at the surface of the ice and snow must be estimated based on air temperatures. Another is that it’s not so easy to maintain or monitor weather gauges in the remote and frigid part of the world. What’s really going on with Arctic sea ice? Scientists announced Friday that Arctic sea ice has officially reached its minimum extent for the summer, shrinking to 5.1 million square kilometers.
That’s significantly higher than last year’s record low of just over 3.4 million square kilometers, a fact that has led conservative news outlets and even members of Congress to suggest that worries about global warming and melting ice are overstated. But as astronomer and Slate writer Phil Plait explains in this video, these claims are “incredibly misleading.” “You can’t look year-to-year, that’s not the right way to do this,” says Plait. “The right way to do this is to look over a long period of time. Sorry, skeptics: Arctic ice is still melting quickly this summer.