Watch 27 years of old arctic ice melt away in seconds. Arctic sea ice loss the area covered by arctic sea ice at least four years old has decreased from 718,000 sq miles in september 1984 to 42,000 sq. Why are the ice caps melting the dangers of global warming. Arctic ice a historical viewpoint watts up with that. Due to the clear link to their diminishing habitat, polar bears have become the poster children for the direct impact of this lost arctic sea ice. So, the fact that the arctic sea ice extent seems to have been decreasing since then is not an indicator of unusual and dramatic melting of the arctic. In 1988, ice that was at least 4 years old accounted 26 percent of the arctics sea ice. Ice scientists ken golden and chris polashenski drill a plastic tube into the arctic ice cap north of alaska as part of their research into melt ponds that form on the ice every spring. The arctic sea ice melting season usually lasts from march to the middle of september. In april 2018, another book on this subject will be published, written by mark serreze, director of the national snow and ice data center, boulder, usa. Viennaafter this winters extraordinary arctic heat wave, summer sea ice extent is likely to drop nearor even belowthe record low set in 2012, american and european scientists have. Heatwaves amplify near record levels of ice melt in northern hemisphere this article is more than 9 months old greenlands ice sheet shrank more in past month than in average year, experts warn. Arctic melt season lengthening, ocean rapidly warming.
During the 1980s, a substantial portion of the arctic ocean was covered by this old ice around the sea ice maximum figure 6. It has shown a dramatic overall decline over the past 30 years. An illustrated guide to 2012 record arctic sea ice melt. Woods hole scientists investigate arctic ice melt caused. The arctic sea ice minimum volume dropped sharply this year. The sun has set over the central arctic ocean and arctic sea ice extent is now increasing. It was the 11 thlowest maximum in the 42year satellite record. The numbers have been coming in and scientists have been looking at them with a sense of amazement. Arctic sea ice shrinks to lowest extent ever recorded. The arctic ice cap is melting faster than scientists had expected and will shrink 40 percent by 2050 in most.
As of this writing, weve just come off the fifth recordlow sea ice. A distinct feature of this ecosystem, is the disappearance melt every summer and reestablishing in autumn and winter. The bulk of the article was quite good, but at the end succumbed to the standard. The spread of sea ice in the area last winter was the smallest on record and the melt season was 30 to 40 days longer than average in the northern regions of greenland, according to the noaa 2015 arctic report card. Since 1979, the length of the melt season for arctic sea ice has grown by 37 days see figure 3. The peak antarctic value recorded so far of over 20 million square kilometers 7. In the past couple of days, the media have reported grim melting of ice in the arctic while disgracefully ignoring the history of the region prior to 1979 and explorations of the area as far back as 1903. In 1985, 16% of the ice pack relative to the total sea ice areal coverage was four years old and older, but by march 2016 old ice only constituted 1. The arctic shattered heat records in the past year as unusually warm air triggered massive melting of ice and snow and a late fall freeze, us government scientists said on tuesday. As sea ice, as well as land ice on greenland and antarctica, continues to melt, the rise in. In the arctic ocean, some ice stays frozen yearround, lasting for many years before melting.
Since 1988, arctic sea ice is getting younger, and young ice is not a good thing. Arctic sea ice ecology seasonal dynamics in algal and bacterial. On march 24, the national snow and ice data center nsidc reported that the 20192020 growth season had an unexceptional finish. Arctic ice melt already affecting weather patterns where. This record pace of arctic ice melt has scientists concerned about rising sea levels, diminished habitats for polar bears and other animals and an impending rush for fossil fuels in the region. Earlier this year arctic sea ice sank to a record low wintertime extent for the third straight year. Sea ice extent in antarctica appears to have passed its seasonal maximum. Arctic sea ice forms in the ocean, unlike glaciers and icebergs that form from landbased freshwater. Images of a disappearing landscape is a brilliant new monograph by universally acclaimed art and environmental photographer diane tuft. Arctic sea ice extentthe area where ice concentration is at least 15 percentreached its apparent annual maximum on march 5, 2020. This years record arctic melt is a problem for everybody. Noting that its ice sheet had reached a historical low of 3m sq. With arctic sea ice unusually thin, scientists wary of. During christmas week, the north pole soared to about 50 degrees fahrenheit warmer than normal.
Once sea ice begins to melt, a selfreinforcing cycle often begins. This year also marks the first time that there has been less. Arctic sea ice news and analysis sea ice data updated. If so, summer ice extent could hit a plateau and not disappear for many years. Helgesen, leif magne, holmen, kim, misund, ole arve, stoltenberg, jens.
The length of the melt season for arctic sea ice is growing by several days each decade, and an earlier start to the melt season is allowing the arctic ocean to absorb enough additional solar. Hottest arctic on record triggers massive ice melt warming at the top of the world went into overdrive, happening twice as fast as the rest of the globe and extending heat into cooler months. Books on the arctic, antarctic and greenland yale climate. The mainstream press will not report this because they are not interested in facts or real science, says reader martin siebert. Government scientists who keep track of those losses during the warmer.
Ice extent remains below average, in part a result of the persistence of the negative phase of the arctic oscillation that has kept winter temperatures warmer than average. Less old multiyear ice implies that the ice cover is thinning, which makes it more vulnerable to further melting. In the arctic, the old ice is disappearing the new york. Melting of arctic sea ice already setting records in 2016. In the 1990s, researchers in the arctic noticed that floating summer sea ice had begun receding. Record melt will see arctic icefree in summer by 2030. And so a fairly small pretubance will actually melt a lot of the ice because its thin to begin with. Instead, it seems that the satellite monitoring of the arctic sea ice just coincidentally started at the wrong time, i. Hottest arctic on record triggers massive ice melt the report card this year clearly shows a stronger and more pronounced signal of persistent warming than any previous year in our observational. An epic final quest into the melting arctic 9781493022960. But this winter, the region hit a record low for ice older than five years. As more ice melts and exposes more dark water, the water absorbs more sunlight. Rockwell explains why the ice caps are melting, what global warming is, what.
Distracting from the news that arctic seaice extent reached a record low on sept. Extreme arctic melt is raising sea level rise threat. An area of the arctic sea ice pack roughly northeast of the new siberian islands, captured by multiple orbits of the modis instrument on nasas terra satellite on sept. Arctic sea ice dwindles to record low for winter cbs news. The antarctic passed its summer minimum ice extent, reaching the second highest level in the satellite record at this time of year. Jonathan leake of the sunday times recently penned an article on the impending sea ice record.
Researchers look into the future of the far north for clues to save species and maybe even bring back sea ice. The phenomenon is fueled by a feedback loop where rising temperatures melt arctic sea ice, which leaves dark open water that absorbs more warmth from. There is not much left now, its just a matter of time a little time, and governments are not yet prepared for climate change that will lower global temperatures by 1 2. Melting arctic ice is the new normal, nasa says cbs news. Sea ice dominates the lower left half of the image. The decline of arctic sea ice is already setting records in 2016, with the winter peak in march clocking in as the lowest since satellite records began, scientists say a new and fuller summary of this years arctic winter by the u.
The sea ice in the arctic ocean dropped below the previous alltime record set in 2007. Reports of record arctic ice melt disgracefully ignore history. The authors also write that the arctic ocean could be largely icefree in summer as early as the late 2030s, and that an influx of warmer water could alter climate as far south as the tropics. Heatwaves amplify nearrecord levels of ice melt in. Sea ice in the arctic is melting at a record pace this year, suggesting warming at the north pole is speeding up and a largely icefree arctic can be expected in summer months within 30 years. Firstyear ice now dominates the ice cover, comprising about 78% of the march 2016 ice pack, compared to about 55% in the 1980s.
Record arctic sea ice melt to levels unseen in millennia posted on 5 september 2012 by dana1981. The arctic, what weve seen is the ice getting thinner up there. These are 24% and 27% lower than the previous record lows, both reached on 21 september 2005, and 37% and 38. The arctic was around four to five degrees fahrenheit warmer this spring than it has been in the past, accelerating sea ice melt and preventing sea ice from forming at its usual rates. This has been reported by the national snow and ice data center. Eric rignot, a professor of earth system science at the university of california, irvine who has done extensive research on arctic ice melt, told in an email that melting sea ice is.
In 1985, 20 percent of the ice pack was very old ice, but in march 2015 old ice only. In 1985, about 45 percent of arctic sea ice was made up of older and thicker multiyear ice. The ice is not all the same age or thickness, although it has become somewhat more uniform. Sea ice melt is nearly two weeks ahead of past records for early april, while a new study finds that the arctic system is trending away from its 20th century state into an unprecedented state.
And it kept going, and going, and going, smashing record after record, month after month. The record arctic sea ice decline this year has predictably and deservedly received a fair amonut of media attention. As the washington post reported friday emphasis added. The arctic radiation icebridge sea and ice experiment arise campaign will lead research flights from aug. Browse the amazon editors picks for the best books of 2019, featuring our. Record arctic sea ice melt to levels unseen in millennia. Displayed at the national mall in washington dc on earth day, april 22nd, 2017 during the march for science. Now nasa is flying a set of instruments north of greenland to observe the impact of the melt. The record ice melt comes at the end of a season marked by unusually warm temperatures in the arctic. Since the 1980s, the amount of multiyear ice has declined dramatically. Following a season of unstable conditions this summer, the arctic ice cap will have a recordbreaking melt.
For the third straight year, arctic sea ice peaked at a record low level during the winter season, missing a staggering 471,000 square miles of sea ice compared to the 19812010 average winter peak. Arctic sea ice refers to the area of the arctic ocean covered by ice. This year also marks the first time that there has been less than 4 million square kilometers 1. The bare arctic how a melting arctic changes everything. This book is written like a story but has the support of a well researched paper. Arctic sea ice is nearing its winter maximum and will soon begin its seasonal decline. Astonishing arctic ice melt sets new record though summer melting is a yearly occurrence in the arctic sea, this year set a new benchmark. National snow and ice data centre nsidc confirms the preliminary announcement last week that sea ice reached its annual maximum extent on march 24 this year.
I had no idea that melting arctic sea ice has such a significant radiative force. More ice in the arctic now than in 1971 ice age now. Much of the northernmost ice in the arctic is old and thick, he said, and might be more resistant to melt. The arctic sea ice minimum is the day in a given year when arctic sea ice reaches its smallest extent, occurring at the end of the summer melting season, normally during september. The extent and area of the ice cover reached minima on 14 september 2007 at 4. Accelerated decline in the arctic sea ice cover comiso. Andy mahoney, national snow and ice data center during the winter, frozen sea ice covers most of the arctic ocean.
296 652 170 627 790 346 1499 626 1314 1326 986 764 68 1320 298 737 845 1411 458 1045 269 296 1200 495 1131 1101 352 844 1238 554 527 1311 387 68 134 1042 383 1476 1277 1112 1068 1397 274 1215