The Patriot Hills Blue Ice Area, in the Antarctic, where a research team discovered high sea levels during the last interglacial period were due to a rise of less than 2C in ocean temperature. Views expressed here do not necessarily reflect those of ScienceDaily, its staff, its contributors, or its partners. "That increase alone is comparable to the amount of sea level rise we have seen over the last few decades," said Forest, who has appointments in the departments of meteorology and atmospheric science and geosciences. In February 2020, along with record-breaking high temperatures in the region, satellite images showed that the surface of the largest remaining ice shelf on the Antarctic Peninsula was experiencing a lot of melt. 585, September 24, 2020, p. 538. doi: 10.1038/s41586-020-2727-5. Have any problems using the site? Countries have signed on to the Paris agreement which aims to keep global heating below 2C. These changes largely result from the geographic differences mentioned above, namely Antarctic sea ice’s distance from the pole (sea ice can melt ba… The general picture is that nonlocal MeanAnt produces relatively uniform melt rates within individual sectors, with maximum present-day melt rates below 25 m yr −1 (Fig. "Ice melt projections may underestimate Antarctic contribution to sea level rise." The chaotic nature of the climate system causes each member to yield slightly different responses, and this represents internally generated variability, the scientists said. "This additional ice melt will impact the hurricane storm surges across the globe. When these winds blow over mountains, they remove snow and ice, allowing ancient ice to come to the surface. ScienceDaily. The team, led by scientists at the University of NSW, examined the cause of high sea levels during a period known as the last interglacial, which occurred 129,000-116,000 years ago. www.sciencedaily.com/releases/2020/10/201009102731.htm (accessed December 2, 2020). This figure shows the Japanese Aerospace Exploration Agency (JAXA) Advanced Microwave Scanning Radiometer 2 (AMSR2) sea ice concentration for Antarctic … Fluctuations in the weather can have a significant impact on melting Antarctic ice, and models that do not include this factor can underestimate the global impact of sea level rise, according to Penn State scientists. Penn State. Because of this, modelers test how the ice will respond using a mean temperature found by averaging the results of climate models. Antarctic ice melt related to tropical weather shifts: Study by Gloria Dickie on 1 April 2020 Scientists predominantly believe that the tropics have the largest influence on global weather. Plain Language Summary Climate models do not capture recent Southern Ocean (SO) climate trends of surface cooling, freshening, and sea ice expansion. At the peak of the 2019-2020 melt season, jewel-toned ponds of meltwater spanned a vast area on the George VI ice shelf—a huge slab of floating glacier ice attached to the western side of the Antarctic Peninsula. THIS POST IS A CRITICAL REVIEW OF A PHYS.ORG ARTICLE PUBLISHED IN OCTOBER 2020 SAYING THAT GLOBAL WARMING IS DRIVING ANTARCTIC ICE MELT AND GLOBAL SEA LEVEL RISE FASTER THAT LINK TO THE PHYS.ORG ARTICLE: https://phys.org/news/2020-10-ice-underestimate-antarctic-contribution-sea.html THIS ASSEESSMENT IS CREDITED TO RESEARCH BY MATTHEW … “It means that a large part of the west Antarctic almost certainly disappeared in the last interglacial. ScienceDaily, 9 October 2020. We now assess parameterized melt rate patterns for the entire Antarctic ice sheet in comparison to the observational melt patterns from Rignot et al. "We know ice sheets are melting as global temperatures increase, but uncertainties remain about how much and how fast that will happen," said Chris Forest, professor of climate dynamics at Penn State. 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 The record in recent decades for the highest level of ice to melt in Antarctica in one day was reached on Christmas Eve, data suggests. AGU Blogosphere: From a Glacier’s Perspective (2020, February 19) Boydell Glacier Accumulation Zone Rapid Melt Feature Development February 2020. Shift in atmospheric rivers could affect Antarctic sea ice, glaciers Date: November 23, 2020 Source: American Geophysical Union Summary: It is not intended to provide medical or other professional advice. Ice shelves are the gatekeepers for glaciers flowing from Antarctica toward the ocean. This ice shelf has existed for at least 10,000 years, and soon it will be gone.” The data for the study was collected by aircraft which measure ice surface elevations and bedrock depths and space-based “synthetic aperture radars” that have been operating since 1997. ScienceDaily shares links with sites in the. Anomalous high temperatures were recorded across Antarctica throughout the summer of 2019/2020, leading to melting of ice and exposure of new ice‐free areas. The loss of the Thwaites glacier could trigger the broader collapse of the West Antarctic ice sheet. The scientists found model simulations that did not include the effects of internal climate variability significantly delayed the retreat of the ice sheet by up to 20 years and underestimated future sea level rise. He said the West Antarctic was particularly vulnerable to ocean warming because it sits mostly on the sea bed, rather than on land. "Ice melt projections may underestimate Antarctic contribution to sea level rise." He said the team’s research could be used to focus on which sections of West Antarctica are most vulnerable to the current climate crisis. "It's important to better understand these processes contributing to the additional ice loss because the ice sheets are melting much faster than we expected.". 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. Future climate response to Antarctic Ice Sheet melt caused by … He said the research also suggested this mass melting happened quite early during the ocean warming “somewhere between zero and 2C”. May 28, 2020 May 28, 2020 A new study in the journal Science found that floating ice shelves can melt much more rapidly than previously thought—at a rate of about six miles per year. Accounting for climate variability caused models to predict an additional 2.7 to 4.3 inches -- 7 to 11 centimeters -- of sea level rise by 2100, the scientists recently reported in the journal Climate Dynamics. “A reduction in the buttressing effect of ice shelves is a negative feedback that can lead to glacial acceleration and a … "Every bit adds on to the storm surge, which we expect to see during hurricanes and other severe weather events, and the results can be devastating.". A lot of Antarctic research involves deep ice core drilling to study years of climate history. Antarctica: Too Big to Melt A summer of extremes leaves sobering questions about the state of Earth’s largest store of ice, capable of inundating coastlines worldwide as it melts. The process may expose ice cliffs so tall that they collapse under their own weight, inducing a domino effect that further depletes the ice shelf. Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. “As you walk towards the mountain, you walk over increasingly older ice,” Turney said. Citation: Shift in atmospheric rivers could affect Antarctic sea ice, glaciers (2020, November 23) retrieved 29 November 2020 from This document is subject to copyright. It flowed rapidly into the ocean,” he said. Global sea levels have risen 0.55 inches since 2003 due to ice melt in Antarctica and Greenland driven by climate change according to new data measurements from several NASA satellites. Penn State. Mass melting of the West Antarctic ice sheet, driven by warmer ocean temperatures, was a major cause of extreme sea level rise more than 100,000 years ago, according to new research. Vol. AGU Blogosphere: From a Glacier’s Perspective (2020, February 17) Record Antarctic Temperatures in Feb. 2020 Impact on Eagle Island Ice Cap. Or view hourly updated newsfeeds in your RSS reader: Keep up to date with the latest news from ScienceDaily via social networks: Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Original written by Matthew Carroll. The paper says ocean temperatures during the last interglacial were likely up to 2C warmer than they are today and global sea levels were 6-9 metres higher. To trace Antarctica’s potential contribution to this sea-level rise, the scientists travelled to West Antarctica to the Patriot Hills Blue Ice Area, which is on the periphery of the West Antarctic ice sheet. Professor of Science in the Department of Earth and Planetary Sciences. That melt is equivalent to about 120,000 square miles of 1-meter thick ice. Antarctica logs hottest temperature on record with a reading of 18.3C. (), as shown in Fig. They used some shallow drilling to take ice samples from the surface. S. Sadai et al. "If we're just running with average conditions, we're not seeing these extremes happening on yearly or decadal timescales.". Content on this website is for information only. 7a. The authors say their findings could have “major implications” for the future given the ocean warming and ice melt currently occurring in Antarctica. Compared to the Arctic, Antarctic sea ice shows less variability in summer, and more variability in winter. The question of what caused the Antarctic ice sheet to melt so rapidly during this warming period had been a longstanding enigma. But the Denman Glacier is so big -- at around 10 miles wide -- … In this study, the researchers used what they called “horizontal ice core” analysis, which involved simply walking across the valley towards the mountain. Note: Content may be edited for style and length. “Ocean-driven melting at the base of ice shelves is already the main contributor to mass loss from the Antarctic ice sheet,” he said. The models projected roughly 10.6 to 14.9 inches -- 27 to 38 centimeters -- of sea level rise during that same period without climate variability. The orange line shows 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 ocean warming for that to occur. Chii-Yun Tsai, Chris E. Forest, David Pollard. Even in frigid Antarctica, summer warmth can turn ice into water.
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