Hester conducted his experiments by submerging a dyed block of ice in a flume with a controlled flow of water passing by, and watching it melt. As a fifth-year Ph.D. student at Columbia University’s Lamont-Doherty Earth Observatory, […] NewsNow aims to be the world’s most accurate and comprehensive Iceberg news aggregator, bringing you the latest headlines automatically and continuously 24/7. A mathematics graduate student at the University of Sydney in Australia, Hester and researchers at Woods Hole Oceanographic Institution in Massachusetts are studying how the shape of an iceberg shapes the way it melts. Melting glaciers in Arctic reveal land hidden for 40,000 years, study says. The calving of the 1,636 sq km iceberg is not linked to climate change, scientists say, but could speed up further melting Lisa Cox Mon 30 Sep 2019 20.33 EDT First published on … Icebergs play a critical role in the climate, Cenedese said, and shouldn’t be neglected in models. Antarctica's colossal Thwaites Glacier is melting fast -- and scientists may have discovered why By Emma Reynolds, CNN Updated 12:19 PM ET, Wed September 9, 2020 Even with that complexity, though, the group developed an accurate theoretical model that could be used in future studies. Results of standard laboratory tests performed on adult outpatients to provide an overall picture of their health are fairly consistent between those with obesity and…. Fears that the iceberg could split, causing a tsunami, ... Those of Inaarsuit's 169 residents living nearest the iceberg have been moved, Danish news agency Ritzau said. At the 73rd Annual Meeting of the American Physical Society’s Division of Fluid Dynamics, Hester presented results from his group’s experiments aimed at understanding how melting alters the face-changing boundary of a shrinking iceberg – and how those alterations in turn affect the melting. Share. As a fifth-year Ph.D. student at Columbia University’s Lamont-Doherty Earth Observatory, studying how the Earth’s climate behaved in the past […] Including them could help with prediction: icebergs pump fresh water from ice sheets into oceans, boosting communities of living organisms. By American Physical Society Brett Molina. Some recent scientific models predict that Antarctica’s melting alone could cause sea levels to rise by almost 2 feet by 2100. Sun’s group combined physical experiments, numerical simulations, and theoretical models to investigate the connection between the ice and (turbulent) convective flows. Icebergs form with a wide range of shapes and sizes, Hester said, and distinct thermodynamic processes affect different surfaces. A better understanding of iceberg melting and lake ice formation could provide new indicators of climate change. “Taken as a whole, the generalized retreat of ice shelves along the Antarctic Peninsula, and especially the thinning elsewhere such as at Thwaites Glacier, shows clearly that climate change is causing accelerating mass loss from Antarctica to the oceans,” he said. CNN's Clarissa Ward visits Greenland to learn about how quickly the ice sheet is melting and the effect it has on the planet. Iceberg the Size of ... White found a 30.5-square-mile iceberg broke off the shelf on July 30 or 31. It was about 17-miles long and 25 miles wide, with an area of 4,250 square miles, nearly as big as Connecticut. 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Credit: Chao Sun. The physics of melting ice is well understood, and some models simulate it accurately, she said. Copyright © 1998 - 2020 SciTechDaily. They identified four distinct regimes of different flow dynamics, each of which interacts with other layers and the ice in its own ways. The findings could also help scientists better understand precipitation, Hong said. Greenland’s ice is melting four times faster than thought—what it means. The world's biggest iceberg spins around and … Keep up with the latest scitech news via email or social media. And scientists are warning about signs of climate change. The team used microbiology techniques to analyse the remaining genetic material in the ice samples to look at its likely impact on today’s microbial groups and which viruses thrived in climates and environments throughout history. Eric Hester has spent the last three years chasing icebergs. Glaciologists have raised alarm that a massive new iceberg, designated B-49, may be a result of melting caused by relatively warm water eating away at the ice that surrounds the frozen continent. “Working in isolation isn’t as productive in this case.”. ‘Teetering at the edge’: Scientists warn of rapid melting of Antarctica’s ‘Doomsday glacier’ Thwaites glacier is losing ice at an accelerating rate, threatening catastrophic sea-level rise If provided, your email will not be published or shared. Facebook Twitter Linked In Mail S cientists have discovered that changes in the amount of ice floating in the polar oceans are causing sea levels to rise. “It makes these very weird shapes, especially on the bottom, like the way the wind shapes a mountain on a longer time scale.”. Eric Hester has spent the last three years chasing icebergs. “And each face doesn’t melt uniformly,” added Cenedese. By Grace Rodgers Medill Reports In a race against climate change, Yuxin Zhou, 26, is among the next generation of climate scientists studying the Earth’s responses to rapidly rising temperatures, threatening life on the planet. The iceberg A68a in the South Atlantic was more than 200 … Iceberg - Iceberg - Erosion and melting: Most of the erosion taking place on Antarctic icebergs occurs after the bergs have emerged into the open Southern Ocean. Now, researchers from the US and South Korea have run climate simulations that include the "iceberg effect" and found that melting icebergs could … pic.twitter.com/xzvoghrz7Z, “This is a place where we know the ice shelves are thinning quite fast,” said glaciologist Helen Amanda Fricker from the Scripps Institution of Oceanography in San Diego. An international scientific team has just completed its first major field season on the giant Thwaites Glacier, about 200 miles from Pine Island Glacier, beside the Amundsen Sea in West Antarctica. Not surprisingly, they found that the bottom had the slowest melt rate. Several research ships have since tried to study the pristine seabed it covered for thousands of years, but the floating ice in the Weddell Sea has been too heavy for them to get there. Breaking the ice on melting and freezing A better understanding of iceberg melting and lake ice formation could provide new indicators of climate change. To many companies are comfortable with the way things are and don’t want to change. Most of the melting of an iceberg takes place on its submerged surface because of the high density and thermal conductivity of sea water. Glaciologists have raised alarm that a massive new iceberg, designated B-49, may be a result of melting caused by relatively warm water eating away at the ice that surrounds the frozen continent. “The water density anomalies can induce elaborate fluid dynamics beneath a moving ice front and can drastically change system behaviors,” said Sun. Antarctica’s Pine Island Glacier is one of the most closely watched pieces of ice on Earth. Other studies discussed at the conference focused on ice formation, rather than melting. The iceberg, known as A68a, broke apart from the Antarctic Peninsula in 2017 and has been drifting ever since. Glaciers in West Antarctica like the Thwaites and PIG worry scientists because their melting could eventually expose inland glaciers and even more ice, causing a drastic rise in sea levels. But it’s happening more often at the Pine Island Glacier, also known as PIG, and it’s got glaciologists worried that climate change is to blame. Email address is optional. Working on a grant from the Natural Science Foundation of China with Ziqi Wang from Tsinghua University, Enrico Calzavarini from the University of Lille in France, and Federico Toschi from Eindhoven University of Technology in the Netherlands, Sun showed how the formation of ice on a lake is closely tied to the fluid dynamics of the water beneath. Iceberg B-49 covers 40 square miles, while the many smaller icebergs that also broke free on Feb. 9 cover another 80 square miles. Icebergs are the dominant source of freshwater in the fjords of Greenland – and a significant contributor to freshwater loss in Antarctica. Melting ice changes the ocean water chemistry in other ways, notably adding nutrients like iron and nitrates, which can feed the growth of phytoplankton, a key food for birds and fish. SciTechDaily: Home of the best science and technology news since 1998. Since the formation and melting of ice plays such a critical role in the climate, he said, a better understanding of the fluid dynamics behind the process could help researchers identify and study accurately the markers of a warming world. “The increased frequency of calving seems to be related to the thinning of the ice tongue,” Luckman said. Melting icebergs causing sea level rise. At the 73rd Annual Meeting of the American Physical Society's Division of Fluid Dynamics, researchers shared new insights into melting icebergs and lake ice formation. By Grace Rodgers Medill Reports Melting freshwater icebergs raise critical questions about ocean circulation. Explore more on Glaciers Melting. Our small motor dinghy was carrying seven passengers – a polar guide, two Greenpeace activists, two journalists, a camera operator and a scientist specialising in marine acoustics. A supersized iceberg has broken off East Antarctica. Iceberg B-49, is about twice the size of Washington D.C. “Ice deforms as it melts,” said physical oceanographer Claudia Cenedese, who has worked with Hester on the project. This allows ocean wave action around the edges to penetrate the freeboard portion of the berg. A iceberg weighing one trillion tons has broken away from western Antarctica, according to UK-based research team Project MIDAS. The main causes of iceberg melt are: Insolation, Water convection, Cenedese said Hester’s project brings together collaborators from a range of disciplines and countries, and that a diverse collaboration was needed for such an interdisciplinary project. “This has often been ignored in previous studies.”. All the latest news about Icebergs from the BBC. Others don’t. Relevance is automatically assessed so some headlines not qualifying as Icebergs news might appear - please feel free to contact us regarding any persistent issues. We just approached within a couple of miles of the new giant #PineIslandGlacier iceberg B-49 (the white wall behind smaller icebergs and brash ice in the foreground) on @GlacierThwaites @GlacierOffshore cruise #NBP2002 aboard RV Nathaniel B Palmer. ... (MORE: Residents Evacuated Over Fears of Melting Glacier on Italy's Mont Blanc) Melt and percolation through the weak firn layer bring most of the freeboard volume to the melting point. We set out across the ice-filled Antarctic bay to listen for whales, but first we heard something altogether different: an upside-down sound below the Southern Ocean, something like the sound of climate crisis itself. Fake news is just the tip of the (melting) iceberg. “The time for ice to form and melt, for example, could potentially provide an indicator of climate change.”, Snow Settling Dynamics in Atmospheric Turbulence, How the Growth of Lake Ice Depends on the Fluid Dynamics Underneath. “This is probably caused by the incursion of warmer waters into the area, which may be related to climate change.”. Satellite photographs show Thwaites Glacier and PIG have started flowing faster in recent years, while their edges of floating ice have pulled back toward the land. “It made a fair prediction of ice layer thickness and of icing time,” said Sun. News. “It has been identified as an area that is changing rapidly.”. Find Glaciers Melting Latest News, Videos & Pictures on Glaciers Melting and see latest updates, news, information from NDTV.COM. This story parallels the lives for many companies. The base, submerged in water, doesn’t melt in the same way as the side. NEWS. An iceberg four miles (six kilometers) wide has broken off from a glacier in eastern Greenland and scientists have captured the dramatic event on video. By combining experimental and numerical approaches, Hester and his collaborators charted the relative influences of factors like relative water velocity and aspect ratio, or the proportion of height to width on a side. B-49 is one of two large icebergs now floating away from Antarctica. However, iceberg melt is the combined result of many processes that vary over time and space along with the iceberg's physical properties. “But what you can’t do in those simulations is change the shape of the ice.”. It broke away from PIG last week, while the other, a trillion-ton behemoth dubbed A-68, broke away from the Larsen C Ice Shelf, on the east coast of the Antarctic Peninsula, in 2017, scientists say. When he tried to share the news with others, he was met with skepticism, opposition and disbelief. During a session on particle-laden flows, engineer Jiarong Hong from the St. Anthony Falls Laboratory at the University of Minnesota, in Minneapolis, discussed results from experiments showing how turbulence influences both the speed and distribution of snow as it falls and settles. However, to find answers to what’s happening on ocean surfaces, some scientists are searching ocean floors for evidence of past environments and clues to the pace of current climate change. Opinion. A lake may possess layers of water of differing densities and temperatures. We therefore think that icebergs are an important component of Greenland’s fjords and should be included in studies of ice sheet-ocean interaction.” They are trying to learn why glaciers in the region are melting. All the latest news about Icebergs from the BBC. USA TODAY. But iceberg A-68, unlike B-49, is probably not a result of a warming climate, said Luckman and other glaciologists. Environment News Thursday 29 April 2010. A better understanding of iceberg melting and lake ice formation could provide new indicators of climate change. Tom Metcalfe writes about science and space for NBC News. The world's biggest iceberg is about to enter the open ocean. The dynamics of iceberg melt is missing from most climate models, Cendese said. Iceberg B-15 first broke away from Antarctica's Ross Ice Shelf in March 2000. Melting glaciers in the Arctic have unearthed land that … “With this work, we’ve shown that submarine iceberg melting is another important process in these fjord systems that can influence oceanic heat delivery towards Greenland’s tidewater glaciers. A mathematics graduate student at the University of Sydney in Australia, Hester and researchers at Woods Hole Oceanographic Institution in Massachusetts are studying how the shape of an iceberg shapes the way … Antarctica’s Pine Island Glacier is one of the most closely watched pieces of ice on Earth. For years, scientists have tracked as chunks of the glacier have broken off, an awe-inspiring event known as “calving” that happens naturally. N.B. One day a curious penguin noticed signs that their beloved home, the iceberg, was melting. All Rights Reserved. All around us were jagged, brill… He and his colleagues found that the side facing a current melts faster than sides that run parallel to flow. While many icebergs break off from the normal processes of Antarctica’s coastal glaciers flowing into the sea, Luckman said the changes in the west of Antarctica appear to be caused by a warming climate. November 22, 2020, Visualization of the coupling dynamics of the ice layer and the turbulent convective motions in the water layer. Iceberg A-68, which covers more than 2,000 square miles, recently left Antarctica’s Weddell Sea, heading for the Southern Ocean. 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