To study the influence of basal melting of the Ross Ice Shelf (BMRIS) on the Southern Ocean (ocean southward of 35 ∘ S) in quasi-equilibrium, numerical experiments with and without the BMRIS effect were performed using a global ocean–sea ice–ice shelf coupled model. https://edition.cnn.com/2019/04/30/health/ross-ice-shelf-scli-intl/index.html This improved study revealed an acceleration of near 280% over the span of four decades. That shields much of the grounding line of Ross Ice Shelf from exposure to melt-inducing warm water. There are areas which have not experienced much loss at all, such as East Ross ice shelf. Although sea ice occasionally occupies the bay during cold winters, it is no substitute for the ice shelf in terms of its influence on the glaciers that once fed the Larsen B. Floating ice shelves stabilise the parent ice sheet, and loss of the major ice shelves would lead to accelerating ice flow and sea-level rise of several metres or more. “To understand Antarctica and how it works we need to consider the ice, ocean, atmosphere and geology, and how they interact across various distances and timescales,” said Helen Amanda Fricker, a glaciologist at Scripps Institution of Oceanography and co-author on the study. Heat is supplied by seawater that moves southward beneath the ice shelf from a central warm core and from a western region of high salinity. Antarctica’s ice is already melting at an accelerating rate. Antarctica's ice is already melting at an accelerating rate. The Ross Ice Shelf plays an important role in stabilising the Antarctic ice sheet, buttressing the ice that is constantly moving over the land surface. This area, known as the Ross Sea Polynya, absorbs solar heat quickly in summer and in turn influences the ice shelf cavity. The melting is affected by a large ocean expanse in front of the Ross Sea Ice Shelf that is devoid of sea ice due to strong offshore winds. The study questions previous hypotheses, such as the belief that the heavy melt began in the 1940s to 1970s, suggesting that more recent anthropogenic actions have caused accelerated melt. Abstract. 3034 X. Liu: Modeling the effect of Ross Ice Shelf melting Table 1. The Ross Ice Shelf in Antarctica is melting faster than previously forecast. The giant cold-cavity Ross, Filchner, and Ronne ice shelves covering two-thirds of the total ice-shelf area account for only 15% of net melting. Credit: NASA/Jim Yungel Credit: NASA/Jim Yungel By Katherine Kornei 7 May 2019 The speed at which the Ross Ice Shelf is melting is a matter of worry for scientists because they attribute this to be “solar heating of the surrounding Antarctica Ocean.”The shelf is a massive block of ice with most of it submerged below sea level. Parts of massive Ross Ice Shelf melting 10 times faster . Our results are similar to satellite laser altimetry estimates for the period 2003–2009, suggesting that the Ross Ice Shelf melt rates have been fairly stable for several decades. Ice shelves play a critical role in modulating dynamic loss of ice from the grounded portion of the Antarctic Ice Sheet and its contribution to sea-level rise. (Inside Science) -- Most of the worry over melting ice in Antarctica has focused on the rapidly melting western shore, where there is enough ice to raise worldwide sea levels by up to 4.3 feet. Section of Ross Ice Shelf melting 10 times faster than the rest - study • Source: 1 NEWS Part of the world's biggest slab of ice is melting 10 times faster than the rest, according to new research. The Ross Ice Shelf is currently stable, meaning snowfall replaces the ice lost by basal melting. Part of the world's largest ice shelf is melting 10 times faster than expected due to the sea warming around it, research shows. 4 minutes to read . Das Schelfeis ist mit einer Fläche von rund 525.000 km² (Quelle: AWI ; andere Quellen gehen von 487.800 km² aus) nur geringfügig kleiner als Frankreich und damit das größte Schelfeisgebiet der Antarktis . The Ross Sea is a major drainage basin for the Antarctic Ice Sheet and contains the world’s largest ice shelf. The highest melt rates occur near ice fronts and deep within sub-ice cavities. After validating modeled circulation and air–sea gas exchange through comparison of modeled temperature, salinity, and chlorofluorocarbons with field data, we estimate that the residence time of water in the Ross Ice Shelf cavity is approximately 2.2 yr and that basal melt rates for the ice shelf average 10 cm yr −1. The grounded portion of the shelf used to push back against the glaciers, slowing them down. Scientists have documented one of the most extensive melting events ever recorded in West Antarctica, an area that holds enough land ice to raise sea level by about 11 feet if it fully melted. Because of its lack of ice, the water’s surface absorbs solar heat quickly in the summer. Recent research has found that the ice shelf is disappearing 10 times faster than expected. At about 500,000 sq km, Antarctica's Ross Ice Shelf is equivalent to the area of France. ROSETTA-Ice collected data from the massive Ross Ice Shelf, which helps slow the flow of about 20 percent of Antarctica’s grounded ice into the ocean — equivalent to 38 feet of global sea level rise. RECORDS levels of melting are occurring at the world's largest ice shelf due to the warming sea around it. 30 Apr, 2019 3:08pm . Ice-shelf melting of 544 Gt year −1 is derived from physical and geochemical observations of meltwater outflow, glaciological field studies and modeling of the sub-ice ocean circulation. An international team of scientists conducted an exercise spread out over four years to ascertain how the shelf behaved with the ocean beneath it. Rapid melting identified by the study happens beneath a thin and structurally important part of the ice shelf, where the ice pushes against Ross Island. An incomplete list of ice shelf–ocean coupled modeling studies. Measurements of ice-shelf motion provide insights into processes modifying buttressing. Newly acquired swath bathymetry data and sediment cores provide evidence for two episodes of ice-shelf collapse. Basal melt of 1325 ± 235 gigatons per year (Gt/year) exceeds a calving flux of 1089 ± 139 Gt/year, making ice-shelf melting the largest ablation process in Antarctica. The ice shelf’s location was also found to be a factor in the rapid melting, with it being near a large area of open ocean, known as the Ross Sea Polynya, that is empty of sea ice due to offshore winds. Annual cycle in flow of Ross Ice Shelf, Antarctica: Contribution of variable basal melting Emilie KLEIN, Cyrille MOSBEUX, Peter D. BROMIRSKI, Laurie PADMAN, Yehuda BOCK, Scott R. SPRINGER, Helen A. FRICKER Supplementary Material Table S1. We identify five sites of elevated basal melt rates, in the range 0.5–2 m a −1, near the ice shelf front. Without this pushback, the glaciers that fed the ice sheet have accelerated and thinned. Explore the Ross Ice Shelf with the Continent 7: Antarctica team. Thermohaline observations in the water column beneath the Ross Ice Shelf and along its terminal face show significant vertical stratification, active horizontal circulation, and net melting at the ice shelf base. Ross Ice Shelf, world’s largest body of floating ice, lying at the head of Ross Sea, itself an enormous indentation in the continent of Antarctica.The ice shelf lies between about 155° W and 160° E longitude and about 78° S and 86° S latitude.The current estimate of its area is about 182,000 square miles (472,000 square km), making it roughly the size of the Yukon territory in Canada. Das Ross-Schelfeis ist ein Schelfeis, das die südliche Hälfte des antarktischen Rossmeeres bedeckt. ROSETTA-Ice collected data from the massive Ross Ice Shelf, which helps slow the flow of about 20 percent of Antarctica's grounded ice into the ocean -- equivalent to 38 feet of global sea level rise. Scientists I met down there who had been making the trip south for 40 years pointed out parts of the Ross ice shelf they witness melting faster and farther every year. Most of the melting is concentrated at the ice shelf front at five localized hotspots with melt rates of about half to two meters per year. As new ice is added existing ice is being removed through melting at the base and ice calving at the front. The Ross Ice Shelf is being fed a constant flow of ice from glaciers draining from both the East and West Antarctic Ice Sheets. Dr Williams said the ice shelf is right up against Ross Island which is a pinning point with the island holding the shelf there. These new melt rates are similar to satellite‐derived estimates, indicating that the Ross Ice Shelf has been fairly stable over the past several decades. This has been revealed by an international study conducted by researchers at Cambridge University and the National Institute of Water and Atmospheric Research (NIWA), which analysed the melt rate at the base of the Ross Ice Shelf, the largest Antarctic ice shelf. Against Ross Island which is a major drainage basin for the Antarctic ice sheet and contains the 's. 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