Sentences with phrase «in ice sheet modeling»
«The primary uncertainty in sea level rise is what are the ice sheets going to do over the coming century,» said Mathieu Morlighem, an expert in ice sheet modeling at the University of California, Irvine, who led the paper along with dozens of other contributors from institutions around the world.
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By 2100, the choice of driving climate model conditions dominates the uncertainty, but by 2200, the uncertainty in the ice sheet model and the elevation scheme are larger.
uncertainty in climate / ocean conditions input into the ice sheet model — any uncertainty in these, both present and future, will feed into uncertainty in the ice sheet model.
She has shown, in an ice sheet model with gravitationally self - consistent sea level, there is actually a sea level fall at the grounding line, which acts to stabilize against the marine ice sheet instability.
The large temperature change may be required to produce substantial sea - level change in their ice sheet model, which we suggested above is unrealistically unresponsive to climate change.
Not exact matches
Murali Haran, a professor in the department of statistics at Penn State University; Won Chang, an assistant professor in the department of mathematical sciences at the University of Cincinnati; Klaus Keller, a professor in the department of geosciences and director of sustainable climate risk management at Penn State University; Rob Nicholas, a research associate at Earth and Environmental Systems Institute at Penn State University; and David Pollard, a senior scientist at Earth and Environmental Systems Institute at Penn State University detail how parameters and initial values drive an ice sheet model, whose output describes the behavior of the ice sheet through time.
Noise and biases are accounted for in the model that ultimately produces ice sheet data.
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.»
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.
Recent modelling by researchers from the Potsdam Institute for Climate Impact Research in Germany, as well as studies of past climate, suggest that the planet will soon have warmed enough to melt Greenland's ice sheet entirely — if it hasn't already become warm enough.
Materials scientists hope their computer model results will spark further research into the effects of carbon dioxide on fracturing in glaciers and ice sheets
This allowed them to calculate the redistribution of mass on Earth's surface due to the melting of the Greenland and Antarctic ice sheets and mountain glaciers, and model the shift in Earth's axis.
Modeling studies on geoengineering to reflect sunlight away from the Earth suggest that modifying the planet's reflectivity could slow the meltdown of the Greenland ice sheet in the short term, but not stop it entirely, and could still allow an eventual total meltdown in the next millennia or so.
Several of the PlioMIP2 research groups are modeling how the polar ice sheets responded in the heat of the Pliocene.
«Sea - level rise could nearly double over earlier estimates in next 100 years: Researchers model effects of melting Antarctic ice sheets.»
The revised estimate for sea - level rise comes from including new processes in the 3 - dimensional ice sheet model, and testing them against past episodes of high sea - levels and ice retreat.
«It's a major impediment to developing realistic ice sheet models when you don't even know how thick some of these outlet glaciers are,» says Eric Rignot, a remote - sensing glaciologist at the NASA Jet Propulsion Laboratory in Pasadena, California.
The team used the new scheme in five ice sheet models and forced them with climate warming conditions taken from two different climate models.
In the Coast Guard's spring tests, small - scale models navigated an ice sheet as long as one - and - a-half Olympic - sized swimming pools at the National Research Council's ice - tank test facility in Newfoundland to measure various designs» resistance, power and maneuverability (shown belowIn the Coast Guard's spring tests, small - scale models navigated an ice sheet as long as one - and - a-half Olympic - sized swimming pools at the National Research Council's ice - tank test facility in Newfoundland to measure various designs» resistance, power and maneuverability (shown belowin Newfoundland to measure various designs» resistance, power and maneuverability (shown below).
The international research initiative IceGeoHeat led by the GFZ German Research Centre for Geosciences establishes in the current online issue of Nature Geoscience that this effect can not be neglected when modeling the ice sheet as part of a climate study.
Her model describes the ice sheet as a heat - driven conveyor belt enabling the three requirements of life — water, energy, and chemistry — to exist in the same place at the same time.
In other words, the losses of mass of the West Antarctic Ice Sheet will intensify — just like the models predict.»
A new model, investigating the retreat of this ice sheet and its many impacts has just been published in Quaternary Science Reviews.
When the researchers compared their results with the output of a number of climate models, they found that several of the newer models that have higher resolution and use updated ice sheet configurations do «a very good job» of reproducing the patterns observed in the proxy records.
The researchers then used a computer model of Earth that simulated growth in the Antarctic ice sheet to see what geophysical impacts this would have aside from generally lowering the sea level.
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.»
In the study, researchers analyzed a series of transient Coupled General Circulation Model simulations forced by changes in greenhouse gases, orbital forcing, meltwater discharge and the ice - sheet history throughout the past 21,000 yearIn the study, researchers analyzed a series of transient Coupled General Circulation Model simulations forced by changes in greenhouse gases, orbital forcing, meltwater discharge and the ice - sheet history throughout the past 21,000 yearin greenhouse gases, orbital forcing, meltwater discharge and the ice - sheet history throughout the past 21,000 years.
But the large volumes of data on Arctic sea and land ice that IceBridge has collected during its nine years of operations there have also enabled scientific discoveries ranging from the first map showing what parts of the bottom of the massive Greenland Ice Sheet are thawed to improvements in snowfall accumulation models for all of Greenlaice that IceBridge has collected during its nine years of operations there have also enabled scientific discoveries ranging from the first map showing what parts of the bottom of the massive Greenland Ice Sheet are thawed to improvements in snowfall accumulation models for all of GreenlaIce Sheet are thawed to improvements in snowfall accumulation models for all of Greenland.
The IPCC also predicts greater sea - level rise than it did in 2007, as it now includes models of ice - sheet movements.
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.»
In this model of Titan, however, the roots extending below the ice sheet are so much bigger than the bumps on the surface that their buoyancy is pushing them up against the ice sheet.
The IPCC is predicting greater sea level rise than it did in 2007, as it now includes models of ice sheet movements.
Based on a model that excludes ice sheet flow due to a lack of basis in published literature, it is estimated that sea level rise will be, in a low scenario, 18 to 38 cm (7 to 15 inches) and in a high scenario, 26 to 59 cm (10 to 23 inches).
Melt water runoff from a melting of the Greenland Ice Sheet is a potentially major source of freshening not yet included in the models found in the MMD (see Section 8.7.2.2).
Diagnostic modelling can be used to improve the understanding of the processes controlling the behaviour of a particular ice stream, or to study the importance of one or more physical process in an ice sheet in general.
Summer surface meltwater will expand vertical fractures in the ice sheet and lubricate the ice sheet bed, so leading to mechanical breakup by mechanisms that we currently can not model by computer and so can not forecast.
For example, some exciting work being done by David Pollard and Rob DeConto suggests that processes such as ice - cliff collapse and ice - shelf hydrofracturing may play important roles in future ice sheet behavior that have not been well incorporated into most ice sheet models.
Armed with aerial photos that reveal these trimlines, the researchers mapped the past and present sizes of the ice sheet in a 3D computer model.
In parallel we need significant investment in research on ice sheet modelIn parallel we need significant investment in research on ice sheet modelin research on ice sheet models.
As well as using a model to predict the future, we can also use it to reconstruct ice sheets in the past, giving clues as to the behaviour of the ice sheet in different climate settings.
In The Physical Basis of Ice Sheet Modelling, pp. 81 - 91.
Willis, M J, Wilson, T J, James, T S, Mazzotti, S, (2009), GPS Constraints on Glacial Isostatic Adjustment Models and Implications for Ice Sheet Mass Balance in West Antarctica, Eos Trans.
Pine Island Glacier (PIG) in West Antarctica is a good example of the value of both prognostic and diagnostic modelling in understanding and predicting ice sheet behaviour.
Models of mountain (alpine) glaciers are applied to solve similar problems to those models used for polar ice sheets, but typically have a higher resolution (a smaller grid size) and need to consider the effects of steep and often variable bed slopes, and the transverse stresses found in valley glaModels of mountain (alpine) glaciers are applied to solve similar problems to those models used for polar ice sheets, but typically have a higher resolution (a smaller grid size) and need to consider the effects of steep and often variable bed slopes, and the transverse stresses found in valley glamodels used for polar ice sheets, but typically have a higher resolution (a smaller grid size) and need to consider the effects of steep and often variable bed slopes, and the transverse stresses found in valley glaciers.
Ice - sheet modeling research is in a state of rapid development.
This information is vital for numerical models, and answers questions about how dynamic ice sheets are, and how responsive they are to changes in atmospheric and oceanic temperatures.
One recent modeling study focused on this mode of instability estimated that the Antarctic ice sheet has a 1 - in - 20 chance of contributing about 30 centimeters (1.0 feet) to global average sea - level rise over the course of this century and 72 centimeters (2.4 feet) by the end of the next century.
Caption: Visualisation of ice flow in the Antarctic ice sheet model PISM - PIK.
Calov, R., et al., 2002: Large - scale instabilities of the Laurentide ice sheet simulated in a fully coupled climate - system model.
But it leaves a large uncertainty in the timing; more complex coupled ice - sheet and climate models are needed to model this more thoroughly in the future.