Non-linear glacier response to calving events, Jakobshavn Isbræ, Greenland RYAN CASSOTTO,1* MARK FAHNESTOCK,2 JASON M. AMUNDSON,3 MARTIN TRUFFER,2 MARGARET S. BOETTCHER,1 SANTIAGO DE LA PEÑA,4 IAN HOWAT4 1Department of Earth Sciences, University of New Hampshire, Durham, NH, USA 2Geophysical Institute, University of Alaska Fairbanks, Fairbanks, … The reduced friction due to greater buoyancy allows for an increase in velocity. And getting straight to the awesome bits. Some observers have speculated that the area of ice lost could be the largest on record. Jakobshavn Isbræ, located in central-west Greenland, is one of the largest and fastest tidewater glaciers in the world. The glacier terminus region also had a consistent velocity of 20 metres (66 ft) per day (maximum of 26 metres (85 ft) per day in the glacier center), from season to season and year to year, the glacier seemed to be in balance from 1955 to 1985. Land “These images are a very good example of the changes taking place in Greenland.”. February 20, 2015 Glaciers Calving, Chasing Ice, DMI, Espen Olsen, GEUS, Glaciers, Jakobshavn, James Balog, Jason Box, Karina Hansen, Landsat, NSIDC, OLI, SAR, Sentinel Jim Hunt Jakobshavn Isbræ is a glacier in Western Greenland made (more?) It is sometimes referred to in the international scientific literature (by glaciologists) as Jakobshavn Isbræ glacier. It was the longest calving ever captured on film. Investigation of properties of the melange and underlying waters in front of the calving front at Jakobshavn Glacier in west Greenland via airborne probes from a hovering helicopter. Some 35 billion tonnes of icebergs calve off and pass out of the fjord every year. [20] and from the longer-duration forces exerted on the solid Earth during the capsize of very large (e.g., > 1 km3) calved ice volumes. UNESCO's World Heritage Site website uses this name, in connection with mention of the Ilulissat Icefjord world heritage site, which includes the downstream end of the glacier. [22] On 16 August 2015 a calving was identified via satellite images as the largest ever recorded at Jakobshavn, with an area of 12.5 km2. Ilulissat Icefjord (Greenlandic: Ilulissat Kangerlua) was declared a UNESCO World Heritage Site in 2004. Land [28][29] There are theories that Greenland consists of three large islands under the ice sheet, separated at the coast by three narrow straits, one of them Jakobshavn Glacier. Jakobshavn Isbrae Glacier (Image credit: Ian Joughin) The calving face of the Jakobshavn Isbrae Glacier, where the end of the glacier meets the … Especially large calving events at Jakobshavn have produced glacial earthquakes that are detectable on seismographs worldwide with moment magnitudes in excess of 5.0. [15] After 1997 the glacier began to accelerate and thin rapidly, reaching an average velocity of 34 metres (112 ft) per day in the terminus region. Considering previously published results, the grounding line retreat amounts to 6 km since 1985. Jakobshavn glacier is no stranger to huge calving events. Movement reached more than 17,000 metres per year. In Jakobshavn, the ice flows westward to the ocean and divides into two branches near the coast (Fig. It was declared a UNESCO World Heritage Site in 2004. Scientists track the calving rate and speed of Jakobshavn in part because the glacier is responsible for draining a large portion of the Greenland Ice Sheet. Jakobshavn has been melting since the early 2000s, when it lost its ice shelf. This glacier alone could contribute more to sea level rise than any other single feature in the Northern Hemisphere. Snow and Ice. NASA Goddard Space It is also commonly known by the anglicised version, Jakobshavn Glacier. Image of the Day Jakobshavn—Greenland’s fastest-moving glacier—is notorious for such losses; in 2014 the glacier shed kilometers of ice from its front. Abstract Jakobshavn Isbræ, a tidewater glacier that produces some of Greenland's largest icebergs and highest speeds, reached record-high flow rates in 2012 (Joughin and others, 2014). The glacier front is 3.4 km, and the average height from the sea bed to the top is approximately 200 metres of which 30 to 180 metres are above sea level. Studied for over 250 years, the Jakobshavn Glacier has helped develop modern understanding of climate change and icecap glaciology.[4][5]. Jakobshavn has afterwards slowed to near its pre-1997 speed, with the terminus retreat still occurring until 2015. We use terrestrial radar interferometric observations from August 2012 to characterize the events that led to record-high flow. Among the world’s most dynamic glaciers is Greenland’s Jakobshavn Isbrae, which showed its active nature with a large calving event at the end of May 2014. According to University of Washington glaciologist Ian Joughin, the end of every summer for the last several years has seen Jakobshavn’s calving front move about 600 meters (2,000 feet) farther inland than the summer before. This glacier alone could contribute more to sea level rise than any other single feature in the Northern Hemisphere. The ice stream's speed-up and near-doubling of ice flow from land into the ocean has increased the rate of sea level riseby about 0… Jakobshavn has the highest mass flux of any glacier draining the Greenland Ice Sheet. The local name for this glacier is Sermeq Kujalleq, where "sermeq" is Greenlandic for 'glacier' and "kujalleq" means 'southern'. Scientists track the calving rate and speed of Jakobshavn in part because the glacier is responsible for draining a large portion of the Greenland Ice Sheet. [31], CS1 maint: multiple names: authors list (, "Glacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbrae, Greenland", Geological Survey of Denmark and Greenland, "Force-perturbation analysis of recent thinning and acceleration of Jakobshavn Isbrae, Greenland", "Analysis of the motion behaviour of Jakobshavn Glacier Glacier in Greenland by monocular image sequence analysis", "Greenland's fastest glacier sets new speed record | UW Today", "Equilibrium state of Jakobshavns Isbræ, West Greenland", "Jakobshavn Glacier, West Greenland: 30 years of spaceborne observations", "Cold Water Currently Slowing Fastest Greenland Glacier", "Interruption of two decades of Jakobshavn Isbrae acceleration and thinning as regional ocean cools". 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