0.05 °C/decade since 1957. But he was clear about what the ‘warning signs’ would be. It extends from the far north in the winter and retreats to almost the coastline every summer, getting closer and closer to the coastline every year due to sea ice melting. Overall, not much is going on in East Antarctica — yet. Isabella Velicogna of JPL and the University of California, Irvine, uses Grace data to weigh the Antarctic ice sheet from space. Some of the ice at the Antarctic extends as much as 2 kilometers (1.2 miles) deep underwater. Compared to the Arctic, Antarctic sea ice shows less variability in summer, and more variability in winter. Her work shows that the ice sheet is not only losing mass, but it is losing mass at an accelerating rate. In Antarctica, however, it’s the land ice that really counts. Since liquid water is denser than solid ice, enough meltwater on the surface can open the cracks up deeper down into the ice, leading to disintegration of the shelf. Antarctic ice sheets could be at greater risk of melting than previously thought by University of South Australia Credit: CC0 Public Domain This year's report launched a new subject on changes in the Antarctic ice sheet. An international team of researchers led by geoscientist Dr Kim Jakob from Heidelberg University has now examined the dynamics of the East Antarctic Ice Sheet more closely. Their study finds that melting of the West Antarctic ice sheet caused a sea-level rise of more than three metres and it took less than 2C of ⦠Known as East Antarctica, this section has an average altitude of about 2 kilometer (1.2 miles), higher than the American Colorad⦠⦠6 E.J. A major review published in 2009 found that Rignot’s Pine Island Glacier finding hadn’t been a fluke7: a large majority of the marine glaciers of the Antarctic Peninsula were retreating, and their retreat was speeding up. Last summer, a British group revisited the Pine Island Glacier finding and found that its rate of retreat had quadrupled between 1995 and 20068. “It isn’t just one type of measurement. Over the next few years, satellite radar data showed that some of the ice streams flowing behind Larsen B had accelerated significantly, while others, still supported by smaller ice shelves, had not9. The oceans surrounding Antarctica have been warming10, so Schodlok doesn’t doubt that the ice shelves are being undermined by warmer water being brought up from the depths. Known as East Antarctica, this section has an average altitude of about 2 kilometers (1.2 miles), higher than the American Colorado Plateau. It’s a series of independent measurements that are giving the same results, which makes it more robust.”. A new NASA study says that Antarctica is overall accumulating ice. West Antarctica has warmed by more than 0.1 °C/decade in the last 50 years, and this warming is strongest in winter and spring. Res. It is of high scientific value for further research on the stability of the Antarctic ice sheet and global climate change, Wang added. Over the 1999-2019 period, more than 2.63 million square kilometers of the Antarctic ice sheet surface had experienced observable melting, which is nearly one-fifth of the total area, said the MOST 2020 annual report of remote sensing ⦠Credits: NASA's Operation IceBridge Map showing the rates of mass changes from ICESat 2003-2008 over Antarctica. But with only a few years of data, he couldn’t say whether the retreat was a temporary, natural anomaly or a longer-term trend from global warming. Thinning of the ice shelf reduces its buttressing effect on the glacier behind it, allowing glacier flow to speed up. 47, 1-38 (2009). In the summer, meltwater ponds on the surface can drain into the cracks. Antarctic Ice Melt May Be Worse Than Scientists Thought Antarctica, Petermann Island, Icicles hang from melting iceberg near Lemaire Channel Paul Souders_Getty Images Antarctic sea ice is the sea ice of the Southern Ocean. 2 http://arctic.atmos.uiuc.edu/cryosphere/ IMAGES/ current.anom.south.jpg, 3http://www.sciencedaily.com/releases/ 2009/ 04/090421101629.htm, 4http://nsidc.org/seaice/characteristics/ difference.html. The eastern half is the big player in this game: it holds 10 times more ice than the West â enough, on its own, to raise sea levels by 170 feet. Rignot’s paper surprised many people. A lot of attention has been devoted to sea ice in the Arctic over the last few years, where ice cover has clearly shrunk and thinned since the beginning of the satellite data record in 197813. The answer boils down to the fact that ice can flow without melting. Antarctica holds about 90 percent of all ice on land, as well as 70 percent of all the fresh water on Earth, the report said. Sea ice is mostly frozen seawater, while land ice is frozen freshwater. Melting land ice contributes to sea level rise. Mayewski, et.al., "State of the Antarctic and Southern Ocean Climate System," Rev. By Erik Conway Still, areas of the continent, like the Antarctic Peninsula photographed above, have increased their mass loss in the last decades. Michael Schodlok, a JPL scientist who models the way ice shelves and the ocean interact, says melting of the underside of the shelf is a pre-requisite to these collapses. Antarctic sea ice is ice which forms in salt water mostly during winter months. But ice shelves, which are floating sheets of ice connected to a landmass's coasts, melted at an accelerated rate, the report said. If we want to understand how the ocean is impacting the ice sheet, go to where it’s hitting the ice sheet with a sledgehammer, not with a little tack hammer.”, Meanwhile, measurements from the Grace satellites confirm that Antarctica is losing mass (Figure 1)11. The continent of Antarctica has been losing more than 100 cubic kilometers (24 cubic miles) of ice per year since 2002. They have different effects, too. West Antarctica’s glaciers are in rapid retreat. The retreat of West Antarctica’s glaciers is being accelerated by ice shelf collapse. Radar- and laser-based satellite data show a little mass loss at the edges of East Antarctica, which is being partly offset by accumulation of snow in the interior, although a very recent result from the NASA/German Aerospace Center’s Gravity Recovery and Climate Experiment (Grace) suggests that since 2006 there has been more ice loss from East Antarctica than previously thought5. There’s very little permanent (summer) sea ice compared to the huge mass of the ice sheet itself, so loss of (or gain of) sea ice in the southern ocean won’t make a big difference to the Earth’s reflectivity (or ‘albedo’). Historian, NASA/Jet Propulsion Laboratory. The Antarctic Peninsula experienced the most severe melting, said the report. But he admits that it hasn’t been proven rigorously, because satellites can’t measure underneath the ice. Res. Larger Image The Antarctic ice sheet. Sea ice waxes and wanes with the seasons, but minimum and maximum extents rarely match from year to year; over years and decades, summer and winter extents vary. Ten ice shelves along the Antarctic Peninsula have disintegrated since the 1970s, including two spectacular collapses last decade. These radar data can reveal ice motion and, by the late 1990s, there was enough data for scientists to measure the annual motion of the Pine Island Glacier. An international team of researchers led by geoscientist Dr Kim Jakob from Heidelberg University has now examined the dynamics of the East Antarctic Ice Sheet more closely. If all that ice melts, it would raise the global sea level by 58.3 meters. 6 Climate models, or computer simulations that incorporate all the factors that affect Earthâs climate, predicted this behavior. Geophys. Most ice sheets, particularly those located in the inner parts of the continent, were generally stable from 1999 to 2019. A new scientific study found Antarctica is melting six times faster than 40 years ago. The latest data reveals that Antarctica is losing ice at an accelerating rate, too. Melting glaciers (land ice) contribute to sea level rise; melting sea ice does not. They behave very differently. It is predicted that the melting conditions of the Antarctic ice sheet surface will continue to increase, especially in West Antarctica and Antarctic Peninsula. Rothrock, "Decline in Arctic sea ice thickness from submarine and ICESat records: 1958 - 2008," Geophys. 7 These long-term ⦠The thinner shelf is also more likely to crack. A new paper explores what will happen to the southernmost continent if we curb carbon emissions â or do nothing. And the Pine Island Glacier would contribute about 10 percent of that. JPL scientist Ron Kwok saw it as demonstrating that “the old idea that glaciers move really slowly isn’t true any more.” One result was that a lot more people started to use the radar data to examine much more of Antarctica. 31, L18401 (2004). 7P.A. Lett. Under a âbusiness as usualâ climate scenario, in which carbon emissions continue unabated, it is estimated that the melting of Antarctic ice will cause global sea level to rise up to three times as much as it did in the last century. Its impact on the sea level rise will become significant. 11Isabella Velicogna, "Increasing rates of ice mass loss from the Greenland and Antarctic ice sheets revealed by GRACE," Geophys. Two-thirds of Antarctica is a high, cold desert. Climate scientists are interested in Arctic sea ice decline because permanent sea ice (i.e. Over the 1999-2019 period, more than 2.63 million square kilometers of the Antarctic ice sheet surface had experienced observable melting, which is nearly one-fifth of the total area, said the MOST 2020 annual report of remote sensing monitoring on the global ecological environment. Larger Image Two-thirds of Antarctica is a high, cold desert. As temperatures rise due to climate change, the melting of polar ice sheets is accelerating. 13 R. Kwok & D.A. There has been lots of talk lately about Antarctica and whether or not the continentâs giant ice sheet is melting. Antarctic sea ice had been gradually increasing during 40 years of measurement and reached a record maximum in 2014, before falling markedly. “Once we lose the summer ice cover permanently, will we tip the planet into a new climate state?”. Because it’s a group of islands, much of the West Antarctic Ice Sheet (WAIS, in jargon) is actually sitting on the floor of the Southern Ocean, not on dry land. About 19 percent of the surface of the Antarctic ice sheet had experienced melting during the past two decades, according to a report released Friday by the Chinese Ministry of Science and Technology (MOST). Pine Island is the largest of these islands and the largest ice stream in West Antarctica is called Pine Island Glacier. Res.Lett. This subject analyzes the temporal and spatial variation characteristics of the Antarctic ice sheet surface melting, ice shelf disintegration, and penguin habitat distribution and their correlations, said Wang Qi'an, director of the National Remote Sensing Center of China. Science Editor: As temperatures rise due to climate change, the melting of polar ice sheets is accelerating. How the ice shelf crumbles 9 E. Rignot et.al., "Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf," Geophys. The WAIS, if it melted completely, would raise sea level by 5 to 7 meters (16 to 23 feet). The study looked at 176 different basins around Antarctica where ice drains into the ocean and found that the rate of melting is increasing, ⦠Antarcticaâs ice is melting fast. A longstanding theory in glaciology is that these ice shelves tend to buttress (support the end wall of) glaciers, with their mass slowing the ice movement towards the sea. M. Robertson et al., “Long term temperature trends in the deep waters of the Weddell Sea”, Deep Sea Research 49, 21, 4791-4806 (2002); http://condor.pems.adfa.edu.au/FD-Course/webpage/longterm.pdf. There has been lots of talk lately about Antarctica and whether or not the continent’s giant ice sheet is melting. Geosci. As temperatures rise due to climate change, the melting of polar ice sheets is accelerating. These charts show just how high sea levels will rise if Antarctica's ice continues melting at an alarming rate. This was confirmed by the spectacular collapse of the Rhode Island-sized Larsen B shelf along the eastern edge of the Antarctic Peninsula in 2002. Melting was mostly distributed on the edge of the Antarctic ice sheet and the Antarctic Peninsula, with an increasing trend. 12 J. H. Mercer, "West Antarctic ice Sheet and CO2 Greenhouse Effect-Threat of Disaster," Nature 271 (5643), 321-325 (1978). The fact that it’s above linear, this is the important idea, that ice loss is increasing with time,” she says. If all of this ice melted, it would raise global sea level by about 60 meters (197 feet). ... Go back to the melting ice in a glass of water. Lett. http://arctic.atmos.uiuc.edu/cryosphere/ IMAGES/ current.anom.south.jpg, http://www.sciencedaily.com/releases/ 2009/ 04/090421101629.htm, http://nsidc.org/seaice/characteristics/ difference.html. Free-floating sea ice gets blown around by the wind, while glaciers move downhill, driven by gravity. But the loss of land ice in Antarctica threatens to raise global sea level, sparking scientists’ interest in the southernmost continent. 5 J. L. Chen et al., “Accelerated Antarctic ice loss from satellite gravity measurements,” Nat. West Antarctica is very different. Ice is ice, right? âTeetering at the edgeâ: Scientists warn of rapid melting of Antarcticaâs âDoomsday glacierâ Thwaites glacier is losing ice at an accelerating rate, threatening catastrophic sea-level rise During the period, around 19 percent of Antarctica's area experienced melting. Science Editor: He’s leading an expedition scheduled to start in 2011 to drill through the Pine Island Glacier and place an automated buoy into the water below it. Warming waters caused by climate change will continue to accelerate the melting of ⦠Decrease, but for the continent ’ s glaciers is being used the! 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0.05 °C/decade since 1957. But he was clear about what the ‘warning signs’ would be. It extends from the far north in the winter and retreats to almost the coastline every summer, getting closer and closer to the coastline every year due to sea ice melting. Overall, not much is going on in East Antarctica — yet. Isabella Velicogna of JPL and the University of California, Irvine, uses Grace data to weigh the Antarctic ice sheet from space. Some of the ice at the Antarctic extends as much as 2 kilometers (1.2 miles) deep underwater. Compared to the Arctic, Antarctic sea ice shows less variability in summer, and more variability in winter. Her work shows that the ice sheet is not only losing mass, but it is losing mass at an accelerating rate. In Antarctica, however, it’s the land ice that really counts. Since liquid water is denser than solid ice, enough meltwater on the surface can open the cracks up deeper down into the ice, leading to disintegration of the shelf. Antarctic ice sheets could be at greater risk of melting than previously thought by University of South Australia Credit: CC0 Public Domain This year's report launched a new subject on changes in the Antarctic ice sheet. An international team of researchers led by geoscientist Dr Kim Jakob from Heidelberg University has now examined the dynamics of the East Antarctic Ice Sheet more closely. Their study finds that melting of the West Antarctic ice sheet caused a sea-level rise of more than three metres and it took less than 2C of ⦠Known as East Antarctica, this section has an average altitude of about 2 kilometer (1.2 miles), higher than the American Colorad⦠⦠6 E.J. A major review published in 2009 found that Rignot’s Pine Island Glacier finding hadn’t been a fluke7: a large majority of the marine glaciers of the Antarctic Peninsula were retreating, and their retreat was speeding up. Last summer, a British group revisited the Pine Island Glacier finding and found that its rate of retreat had quadrupled between 1995 and 20068. “It isn’t just one type of measurement. Over the next few years, satellite radar data showed that some of the ice streams flowing behind Larsen B had accelerated significantly, while others, still supported by smaller ice shelves, had not9. The oceans surrounding Antarctica have been warming10, so Schodlok doesn’t doubt that the ice shelves are being undermined by warmer water being brought up from the depths. Known as East Antarctica, this section has an average altitude of about 2 kilometers (1.2 miles), higher than the American Colorado Plateau. It’s a series of independent measurements that are giving the same results, which makes it more robust.”. A new NASA study says that Antarctica is overall accumulating ice. West Antarctica has warmed by more than 0.1 °C/decade in the last 50 years, and this warming is strongest in winter and spring. Res. It is of high scientific value for further research on the stability of the Antarctic ice sheet and global climate change, Wang added. Over the 1999-2019 period, more than 2.63 million square kilometers of the Antarctic ice sheet surface had experienced observable melting, which is nearly one-fifth of the total area, said the MOST 2020 annual report of remote sensing ⦠Credits: NASA's Operation IceBridge Map showing the rates of mass changes from ICESat 2003-2008 over Antarctica. But with only a few years of data, he couldn’t say whether the retreat was a temporary, natural anomaly or a longer-term trend from global warming. Thinning of the ice shelf reduces its buttressing effect on the glacier behind it, allowing glacier flow to speed up. 47, 1-38 (2009). In the summer, meltwater ponds on the surface can drain into the cracks. Antarctic Ice Melt May Be Worse Than Scientists Thought Antarctica, Petermann Island, Icicles hang from melting iceberg near Lemaire Channel Paul Souders_Getty Images Antarctic sea ice is the sea ice of the Southern Ocean. 2 http://arctic.atmos.uiuc.edu/cryosphere/ IMAGES/ current.anom.south.jpg, 3http://www.sciencedaily.com/releases/ 2009/ 04/090421101629.htm, 4http://nsidc.org/seaice/characteristics/ difference.html. The eastern half is the big player in this game: it holds 10 times more ice than the West â enough, on its own, to raise sea levels by 170 feet. Rignot’s paper surprised many people. A lot of attention has been devoted to sea ice in the Arctic over the last few years, where ice cover has clearly shrunk and thinned since the beginning of the satellite data record in 197813. The answer boils down to the fact that ice can flow without melting. Antarctica holds about 90 percent of all ice on land, as well as 70 percent of all the fresh water on Earth, the report said. Sea ice is mostly frozen seawater, while land ice is frozen freshwater. Melting land ice contributes to sea level rise. Mayewski, et.al., "State of the Antarctic and Southern Ocean Climate System," Rev. By Erik Conway Still, areas of the continent, like the Antarctic Peninsula photographed above, have increased their mass loss in the last decades. Michael Schodlok, a JPL scientist who models the way ice shelves and the ocean interact, says melting of the underside of the shelf is a pre-requisite to these collapses. Antarctic sea ice is ice which forms in salt water mostly during winter months. But ice shelves, which are floating sheets of ice connected to a landmass's coasts, melted at an accelerated rate, the report said. If we want to understand how the ocean is impacting the ice sheet, go to where it’s hitting the ice sheet with a sledgehammer, not with a little tack hammer.”, Meanwhile, measurements from the Grace satellites confirm that Antarctica is losing mass (Figure 1)11. The continent of Antarctica has been losing more than 100 cubic kilometers (24 cubic miles) of ice per year since 2002. They have different effects, too. West Antarctica’s glaciers are in rapid retreat. The retreat of West Antarctica’s glaciers is being accelerated by ice shelf collapse. Radar- and laser-based satellite data show a little mass loss at the edges of East Antarctica, which is being partly offset by accumulation of snow in the interior, although a very recent result from the NASA/German Aerospace Center’s Gravity Recovery and Climate Experiment (Grace) suggests that since 2006 there has been more ice loss from East Antarctica than previously thought5. There’s very little permanent (summer) sea ice compared to the huge mass of the ice sheet itself, so loss of (or gain of) sea ice in the southern ocean won’t make a big difference to the Earth’s reflectivity (or ‘albedo’). Historian, NASA/Jet Propulsion Laboratory. The Antarctic Peninsula experienced the most severe melting, said the report. But he admits that it hasn’t been proven rigorously, because satellites can’t measure underneath the ice. Res. Larger Image The Antarctic ice sheet. Sea ice waxes and wanes with the seasons, but minimum and maximum extents rarely match from year to year; over years and decades, summer and winter extents vary. Ten ice shelves along the Antarctic Peninsula have disintegrated since the 1970s, including two spectacular collapses last decade. These radar data can reveal ice motion and, by the late 1990s, there was enough data for scientists to measure the annual motion of the Pine Island Glacier. An international team of researchers led by geoscientist Dr Kim Jakob from Heidelberg University has now examined the dynamics of the East Antarctic Ice Sheet more closely. If all that ice melts, it would raise the global sea level by 58.3 meters. 6 Climate models, or computer simulations that incorporate all the factors that affect Earthâs climate, predicted this behavior. Geophys. Most ice sheets, particularly those located in the inner parts of the continent, were generally stable from 1999 to 2019. A new scientific study found Antarctica is melting six times faster than 40 years ago. The latest data reveals that Antarctica is losing ice at an accelerating rate, too. Melting glaciers (land ice) contribute to sea level rise; melting sea ice does not. They behave very differently. It is predicted that the melting conditions of the Antarctic ice sheet surface will continue to increase, especially in West Antarctica and Antarctic Peninsula. Rothrock, "Decline in Arctic sea ice thickness from submarine and ICESat records: 1958 - 2008," Geophys. 7 These long-term ⦠The thinner shelf is also more likely to crack. A new paper explores what will happen to the southernmost continent if we curb carbon emissions â or do nothing. And the Pine Island Glacier would contribute about 10 percent of that. JPL scientist Ron Kwok saw it as demonstrating that “the old idea that glaciers move really slowly isn’t true any more.” One result was that a lot more people started to use the radar data to examine much more of Antarctica. 31, L18401 (2004). 7P.A. Lett. Under a âbusiness as usualâ climate scenario, in which carbon emissions continue unabated, it is estimated that the melting of Antarctic ice will cause global sea level to rise up to three times as much as it did in the last century. Its impact on the sea level rise will become significant. 11Isabella Velicogna, "Increasing rates of ice mass loss from the Greenland and Antarctic ice sheets revealed by GRACE," Geophys. Two-thirds of Antarctica is a high, cold desert. Climate scientists are interested in Arctic sea ice decline because permanent sea ice (i.e. Over the 1999-2019 period, more than 2.63 million square kilometers of the Antarctic ice sheet surface had experienced observable melting, which is nearly one-fifth of the total area, said the MOST 2020 annual report of remote sensing monitoring on the global ecological environment. Larger Image Two-thirds of Antarctica is a high, cold desert. As temperatures rise due to climate change, the melting of polar ice sheets is accelerating. 13 R. Kwok & D.A. There has been lots of talk lately about Antarctica and whether or not the continentâs giant ice sheet is melting. Antarctic sea ice had been gradually increasing during 40 years of measurement and reached a record maximum in 2014, before falling markedly. “Once we lose the summer ice cover permanently, will we tip the planet into a new climate state?”. Because it’s a group of islands, much of the West Antarctic Ice Sheet (WAIS, in jargon) is actually sitting on the floor of the Southern Ocean, not on dry land. About 19 percent of the surface of the Antarctic ice sheet had experienced melting during the past two decades, according to a report released Friday by the Chinese Ministry of Science and Technology (MOST). Pine Island is the largest of these islands and the largest ice stream in West Antarctica is called Pine Island Glacier. Res.Lett. This subject analyzes the temporal and spatial variation characteristics of the Antarctic ice sheet surface melting, ice shelf disintegration, and penguin habitat distribution and their correlations, said Wang Qi'an, director of the National Remote Sensing Center of China. Science Editor: As temperatures rise due to climate change, the melting of polar ice sheets is accelerating. How the ice shelf crumbles 9 E. Rignot et.al., "Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf," Geophys. The WAIS, if it melted completely, would raise sea level by 5 to 7 meters (16 to 23 feet). The study looked at 176 different basins around Antarctica where ice drains into the ocean and found that the rate of melting is increasing, ⦠Antarcticaâs ice is melting fast. A longstanding theory in glaciology is that these ice shelves tend to buttress (support the end wall of) glaciers, with their mass slowing the ice movement towards the sea. M. Robertson et al., “Long term temperature trends in the deep waters of the Weddell Sea”, Deep Sea Research 49, 21, 4791-4806 (2002); http://condor.pems.adfa.edu.au/FD-Course/webpage/longterm.pdf. There has been lots of talk lately about Antarctica and whether or not the continent’s giant ice sheet is melting. Geosci. As temperatures rise due to climate change, the melting of polar ice sheets is accelerating. These charts show just how high sea levels will rise if Antarctica's ice continues melting at an alarming rate. This was confirmed by the spectacular collapse of the Rhode Island-sized Larsen B shelf along the eastern edge of the Antarctic Peninsula in 2002. Melting was mostly distributed on the edge of the Antarctic ice sheet and the Antarctic Peninsula, with an increasing trend. 12 J. H. Mercer, "West Antarctic ice Sheet and CO2 Greenhouse Effect-Threat of Disaster," Nature 271 (5643), 321-325 (1978). The fact that it’s above linear, this is the important idea, that ice loss is increasing with time,” she says. If all of this ice melted, it would raise global sea level by about 60 meters (197 feet). ... Go back to the melting ice in a glass of water. Lett. http://arctic.atmos.uiuc.edu/cryosphere/ IMAGES/ current.anom.south.jpg, http://www.sciencedaily.com/releases/ 2009/ 04/090421101629.htm, http://nsidc.org/seaice/characteristics/ difference.html. Free-floating sea ice gets blown around by the wind, while glaciers move downhill, driven by gravity. But the loss of land ice in Antarctica threatens to raise global sea level, sparking scientists’ interest in the southernmost continent. 5 J. L. Chen et al., “Accelerated Antarctic ice loss from satellite gravity measurements,” Nat. West Antarctica is very different. Ice is ice, right? âTeetering at the edgeâ: Scientists warn of rapid melting of Antarcticaâs âDoomsday glacierâ Thwaites glacier is losing ice at an accelerating rate, threatening catastrophic sea-level rise During the period, around 19 percent of Antarctica's area experienced melting. Science Editor: He’s leading an expedition scheduled to start in 2011 to drill through the Pine Island Glacier and place an automated buoy into the water below it. Warming waters caused by climate change will continue to accelerate the melting of ⦠Decrease, but for the continent ’ s glaciers is being used the! 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