“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. 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. All Rights Reserved. A better understanding of iceberg melting and lake ice formation could provide new indicators of climate change. The world's biggest iceberg spins around and … If provided, your email will not be published or shared. A supersized iceberg has broken off East Antarctica. Iceberg B-49 covers 40 square miles, while the many smaller icebergs that also broke free on Feb. 9 cover another 80 square miles. 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 … By American Physical Society Including them could help with prediction: icebergs pump fresh water from ice sheets into oceans, boosting communities of living organisms. For years, scientists have tracked as chunks of the glacier have broken off, an awe-inspiring event known as “calving” that happens naturally. They identified four distinct regimes of different flow dynamics, each of which interacts with other layers and the ice in its own ways. 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. 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. Melting glaciers in Arctic reveal land hidden for 40,000 years, study says. 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 iceberg weighing one trillion tons has broken away from western Antarctica, according to UK-based research team Project MIDAS. Eric Hester has spent the last three years chasing icebergs. 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. Now, researchers from the US and South Korea have run climate simulations that include the "iceberg effect" and found that melting icebergs could … 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. Opinion. When he tried to share the news with others, he was met with skepticism, opposition and disbelief. Brett Molina. The iceberg, known as A68a, broke apart from the Antarctic Peninsula in 2017 and has been drifting ever since. Eric Hester has spent the last three years chasing icebergs. 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. Explore more on Glaciers Melting. 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. The findings could also help scientists better understand precipitation, Hong said. Greenland’s ice is melting four times faster than thought—what it means. This story parallels the lives for many companies. 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. Others don’t. All around us were jagged, brill… November 22, 2020, Visualization of the coupling dynamics of the ice layer and the turbulent convective motions in the water layer. Iceberg B-49, is about twice the size of Washington D.C. However, iceberg melt is the combined result of many processes that vary over time and space along with the iceberg's physical properties. 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. Another project, presented by physicist Chao Sun from Tsinghua University in China and his group during a session on convection and buoyancy-driven flows, focused on ice formation in lakes. 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. All the latest news about Icebergs from the BBC. We therefore think that icebergs are an important component of Greenland’s fjords and should be included in studies of ice sheet-ocean interaction.” Keep up with the latest scitech news via email or social media. They are trying to learn why glaciers in the region are melting. Copyright © 1998 - 2020 SciTechDaily. One day a curious penguin noticed signs that their beloved home, the iceberg, was melting. Antarctica’s Pine Island Glacier is one of the most closely watched pieces of ice on Earth. 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. “This has often been ignored in previous studies.”. The world's biggest iceberg is about to enter the open ocean. Share. The physics of melting ice is well understood, and some models simulate it accurately, she said. 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. 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. Environment News Thursday 29 April 2010. 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. “And each face doesn’t melt uniformly,” added Cenedese. 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. The base, submerged in water, doesn’t melt in the same way as the side. “It has been identified as an area that is changing rapidly.”. 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. But iceberg A-68, unlike B-49, is probably not a result of a warming climate, said Luckman and other glaciologists. N.B. 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. Even with that complexity, though, the group developed an accurate theoretical model that could be used in future studies. Icebergs play a critical role in the climate, Cenedese said, and shouldn’t be neglected in models. “The calving events at Pine Island Glacier are coming more frequently than they used to,” said glaciologist Adrian Luckman from Swansea University in the U.K. in an email. 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. Antarctica’s Pine Island Glacier is one of the most closely watched pieces of ice on Earth. Email address is optional. Not surprisingly, they found that the bottom had the slowest melt rate. Relevance is automatically assessed so some headlines not qualifying as Icebergs news might appear - please feel free to contact us regarding any persistent issues. Melting icebergs causing sea level rise. B-49 is one of two large icebergs now floating away from Antarctica. 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. Fake news is just the tip of the (melting) iceberg. 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 […] It was about 17-miles long and 25 miles wide, with an area of 4,250 square miles, nearly as big as Connecticut. “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. ‘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 The dynamics of iceberg melt is missing from most climate models, Cendese said. 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. 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A better understanding of iceberg melting and lake ice formation could provide new indicators of climate change. 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.
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