Sentences with phrase «ice sheet loss in»

An international team of experts supported by NASA and the European Space Agency (ESA) has combined data from multiple satellites and aircraft to produce the most comprehensive and accurate assessment to date of ice sheet losses in Greenland and Antarctica and their contributions to sea level rise.

Not exact matches

«West Greenland Ice Sheet melting at the fastest rate in centuries: Weather patterns and summer warming trend combine to drive dramatic ice loss.&raqIce Sheet melting at the fastest rate in centuries: Weather patterns and summer warming trend combine to drive dramatic ice loss.&raqice loss.»

This gives confidence in the predictions of the current generation of ice - sheet models which are used to forecast future ice loss from Antarctica and resulting sea - level rise.»

For years, floating ice in the bay abutting the ice sheet in the northeast acted as a barrier to ice loss.

As glaciologist Richard Alley of Pennsylvania State University notes: «The ice sheet is losing mass, this loss has increased over time, [and] it is not the dominant term in sea - level rise — but it matters.»

Yet these model - based estimates do not include the possible acceleration of recently observed increases in ice loss from the Greenland and Antarctic ice sheets.

The study fuels a growing concern among scientists about the factors affecting the Antarctic ice sheet — namely, that warm ocean waters are helping to melt glaciers and drive greater levels of ice loss, particularly in West Antarctica.

«Warming greater than 2 degrees Celsius above 19th - century levels is projected to be disruptive, reducing global agricultural productivity, causing widespread loss of biodiversity and — if sustained over centuries — melting much of the Greenland ice sheet with ensuing rise in sea levels of several meters,» the AGU declares in its first statement in four years on «Human Impacts on Climate.»

«By refining the spatial pattern of mass loss in the world's second largest — and most unstable — ice sheet, and learning how that pattern has evolved, we are steadily increasing our understanding of ice loss processes, which will lead to better - informed projections of sea level rise.»

According to a new study in the journal Science Advances, the hotspot softened the mantle rock beneath Greenland in a way that ultimately distorted their calculations for ice loss in the Greenland ice sheet.

In other words, the losses of mass of the West Antarctic Ice Sheet will intensify — just like the models predict.»

Those changes may include the loss of Arctic summer sea ice, the collapse of ice sheets in Greenland and western Antarctica, dieback of the Amazon rainforest and changes in the jet stream and the pattern of El Niño and La Niña weather cycles.

Dr Ian Joughin at the University of Washington, author of a recent study simulating future Antarctic ice sheet losses added: «This study does a nice job of revealing the strong thinning along the Amundsen Coast, which is consistent with theory and models indicating this region is in the early stages of collapse.»

This paper represents the latest finding from GNET, the GPS network in Greenland that measures ice loss by weighing the ice sheet as it presses down on the bedrock.

«Thus the increased snowfall we report here has not led to thickening of the ice sheet, but is in fact another symptom of the changes that are driving contemporary ice sheet loss.»

Kuhn, from Germany's Alfred Wegener Institute, added, «This gives confidence in the predictions of the current generation of ice sheet models which are used to forecast future ice loss from Antarctica and resulting sea - level rise.»

We know, however, that rapid warming of the planet increases the risk of crossing climatic points of no return, possibly setting in motion large - scale ocean circulation changes, the loss of major ice sheets, and species extinctions.

Despite being trumpeted in certain circles as meaning that there's really nothing to worry about regarding the Greenland ice sheet, the authors made a point of noting (although not in this press release) that an additional source of mass loss needs to be identified in order to reconcile their results with the GRACE data (which do not show a reduction in mass loss for the same period).

First, the loss of mass in the Antarctic ice sheet is actually somewhat unexpected.

The relevant papers are [Velicogna and Wahr 2006 Measurements of time - variable gravity show mass loss in Antarctica Science 311, 1754 - 1756 and Rignot and Thomas «Mass balance of polar ice sheets» Science 297, 1502 - 1506]

[7] The IceCon project aims to gain a better understanding of the rate of the loss of ice — now and in the past - from the Antarctic ice sheet in the Dronning Maud Land area, and includes six partners: Université Libre de Bruxelles, Royal Observatory of Belgium, University of Luxembourg, Norwegian Polar Institute, and Aberystwyth University.

The information from the study helps improve scientists» understanding of the behavior of the ice sheet and what processes control the loss of ice, Beata Csatho, a geophysicist at the University of Buffalo in New York who was not involved with the work, said in a commentary published in the same issue of Nature.

His comments are based on the paper «Limits in detecting acceleration of ice sheet mass loss due to climate variability», B. Wouters, J. L. Bamber, M. R. van den Broeke, J. T. M. Lenaerts and I. Sasgen, Nature Geoscience 6, 613 — 616 (2013) doi: 10.1038 / ngeo1874 Find the abstract and illustrations for that paper here.

For example, ice loss in far - off West Antarctica will have more profound impacts in Scandinavia than it will in nearby Australia, while right now melting Alaskan glaciers contribute more to sea - level rise in the Baltic than the Greenland ice sheet.

This melt is the primary control on Antarctic ice - sheet loss, as the thinner ice shelves are less able to buttress ice in the interior, leading to faster ice flow.

The rate of release from the tundra alone is predicted to reach 1.5 billion tons of carbon per annum before 2030, contributing to accelerated climate change, perhaps resulting in sustained decadal doubling of ice loss causing collapse of the Greenland Ice Sheet (Hansen et al, 201ice loss causing collapse of the Greenland Ice Sheet (Hansen et al, 201Ice Sheet (Hansen et al, 2011).

«New observations from many different sources confirm that ice - sheet loss is accelerating,» the United States Global Change Research Program said in its comprehensive special report on climate science.

In the figure right, from Rignot et al. 2008, you can see that mass losses from Pine Island Glacier and Thwaites Glacier dominate Antarctic Ice Sheet ice lossIce Sheet ice lossice losses.

This feedback could potentially result in the rapid loss of parts of the ice sheet, as grounding lines retreat along troughs and basins that deepen towards the ice sheet's interior.

IceCon aims to gain a better understanding of the rate of the loss of ice — now and in the past - from the Antarctic ice sheet in the Dronning...

Our modelled values are consistent with current rates of Antarctic ice loss and sea - level rise, and imply that accelerated mass loss from marine - based portions of Antarctic ice sheets may ensue when an increase in global mean air temperature of only 1.4 - 2.0 deg.

Our results thus show that, indeed, recent decades in West Antarctica, which have been characterized by very rapid warming, and very rapid loss of ice from the West Antarctic Ice Sheet, are highly unusuice from the West Antarctic Ice Sheet, are highly unusuIce Sheet, are highly unusual.

So unless the perimeter of the Greenland ice sheet is the exact same thickness as the entire ice sheet (say 3 km on average), an area loss there, of 15 %, will produce a much smaller % volume loss, than say if this area loss were smack dab in the middle of the Greenland ice sheet.

Our experiments show a clear threshold in the relationship between the rate of sea - level rise, and the rate of (sea - level contributing) ice - sheet mass loss.

«As the ice sheet in Greenland melts over thousands of years and becomes lower, the temperature will increase because of the elevation loss.

From recent instrumental observations alone we are therefore unable to predict whether mass loss from these ice sheets will vary linearly with changes in the rate of sea - level rise, or if a non-linear response is more likely.

The net loss in volume and hence sea level contribution of the Greenland Ice Sheet (GIS) has doubled in recent years from 90 to 220 cubic kilometers / year has been noted recently (Rignot and Kanagaratnam, 2007).

This result would be strongly dependent on the exact dynamic response of the Greenland ice sheet to surface meltwater, which is modeled poorly in todays global models.Yes human influence on the climate is real and we might even now be able to document changes in the behavior of weather phenomena related to disasters (e.g., Emanuel 2005), but we certainly haven't yet seen it in the impact record (i.e., economic losses) of extreme events.

For example, in the NASA website, they quote 24 cu miles Greenland ice sheet loss, presumably for 2002.

The relevant papers are [Velicogna and Wahr 2006 Measurements of time - variable gravity show mass loss in Antarctica Science 311, 1754 - 1756 and Rignot and Thomas «Mass balance of polar ice sheets» Science 297, 1502 - 1506]

Thus, the concept of an emissions budget is very useful to get the message across that the amount of CO2 that we can still emit in total (not per year) is limited if we want to stabilise global temperature at a given level, so any delay in reducing emissions can be detrimental — especially if we cross tipping points in the climate system, e.g trigger the complete loss of the Greenland Ice Sheet.

Over the time period of our survey, the ice sheet as a whole was certainly losing mass, and the mass loss increased by 75 % in 10 years.

First, the loss of mass in the Antarctic ice sheet is actually somewhat unexpected.

Combined climate / ice sheet model estimates in which the Greenland surface temperature was as high during the Eemian as indicated by the NEEM ice core record suggest that loss of less than about 1 m sea level equivalent is very unlikely (e.g. Robinson et al. (2011).

This is despite using observed ice sheet mass loss (0.19 mm / year) in the «modelled» number in this comparison, otherwise the discrepancy would be even larger — the ice sheet models predict that the ice sheets gain mass due to global warming.

The Greenland ice sheet gains mass via snowfall and losses mass via the production of icebergs and by melt of ice in the ice marginal zone.

In a study of eight Antarctic glaciers, they found that speeds of descent increased by as much as a factor of eight after the loss of the Larsen B ice sheet.

Thus, whatever the contribution of mass loss from the Greenland ice sheet to the huge (4 - 8 m) rise in sea level of the Eemian, it occurred under very strong temperature forcing.

Jonathan Bamber of the Bristol Glaciology Center in England has led a new analysis of just how much the loss of West Antarctica's ice could raise sea levels if the ice sheet fully disintegrated.

I would also keep in mind the fact that we are only speaking of the short - term Charney Climate Sensitivity, and the long - term climate sensitivity is presumably going to be about twice that — due to ice sheet loss and the like.