Sentences with phrase «ice sheet models»

Here, we are considering a computer - based, numerical ice sheet model.

The results provide insights to guide ongoing development of fully dynamic coupled ice sheet models.

In parallel we need significant investment in research on ice sheet models.

Any research involving ice sheet modelling will have a section on uncertainty in the model prediction, and may give a range of prediction values, rather than a single value.

Also ice sheets models, as they become more realistic and are tested against observed ice sheet changes, may aid our understanding.

This is not surprising, given the primitive state of 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.

My interested area is involved with ice sheet modelling in polar regions, glacier isostatic adjustment and global sea level rise.

There will be a major scientific workshop in St Petersburg, Russia, in July 2008, to develop plans for ice sheet modelling as part of the International Polar Year (2007 - 2009).»

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.

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.

Forecasts of future ice sheet behavior appear even more uncertain: Under the same high — global warming scenario, eight ice sheet models predicted anywhere between 0 and 27 cm of sea level rise in 2100 from Greenland melt.

Evolution of Greenland surface elevation and ice sheet volume versus time in the experiment of Ridley et al. (2005) with the UKMO - HadCM3 AOGCM coupled to the Greenland Ice Sheet model of Huybrechts and De Wolde (1999) under a climate of constant quadrupled pre-industrial atmospheric CO2.

The complexity of the system means that it is not straightforward to determine how one thing will affect another, hence, prediction requires a realistic numerical ice sheet model which takes into account all the important processes and how they interact.

A new three - dimensional higher - order thermomechanical ice sheet model: Basic sensitivity, ice stream development, and ice flow across subglacial lakes.

But again the «models» estimate includes an observed ice sheet mass loss term of 0.41 mm / year whereas ice sheet models give a mass gain of 0.1 mm / year for this period; considering this, observed rise is again 50 % faster than the best model estimate for this period.

«We show in simulations using the Parallel Ice Sheet Model that burning the currently attainable fossil fuel resources is sufficient to eliminate the ice sheet,» wrote study researcher Ricarda Winkelmann from the Potsdam Institute for Climate Impact Research in Germany, and colleagues in their study.

«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.

Many ice sheet models are now freely available, for example, Elmer, Glimmer - CISM, ISSM, PISM, SICOPLIS, making it possible for a wider community to be able to use these models to answer a wide range of scientific questions.

Existing ice sheet models imply that the figure is somewhere between 3 and 16 metres.

It suggests that current ice sheet modeling studies are too simplistic to accurately predict the future contributions of the entire Greenland Ice Sheet to sea level rise, and that Greenland may lose ice more rapidly in the near future than previously thought.

Since we are talking about the models that are being used today to model the next 50 or so years and that those models don't generally include ice sheet models, it is correct to describe ice sheet changes as forcings in this case.

This information will be helpful for evaluating the more sophisticated ice sheet models that are crucial for projecting Greenland's future contribution to sea - level rise.

«Improving ice sheet models means we need even finer resolution,» Gogineni said.

Independently, Greenland and Antarctic ice sheet volumes were estimated by observations from adjacent ocean sediment records and by ice sheet models.

«Without bed topography you can not build a decent ice sheet model,» said CReSIS director Prasad Gogineni.

Caption: Visualisation of ice flow in the Antarctic ice sheet model PISM - PIK.

Antarctic ice sheet models double the sea - level rise expected this century if global emissions of heat - trapping pollution remain high.

«Once the timing of equilibrium conditions for the Greenland Ice Sheet is verified, a detailed reconstruction for that period could serve as a steady - state ice sheet surface for initializing ice sheet models,» Csatho writes in the News and Views article.

And Dr Bougamont said: «There are two sources of net ice loss: melting on the surface and increased flow of the ice itself, and there is a connection between these mechanisms that isn't taken into account by standard ice sheet models.»

Continue Reading Ice Sheet Modeling Group

For example, a recent ice sheet model sensitivity study finds that incorporating the physical processes of hydrofracturing of ice and ice cliff failure increases their calculated sea level rise from 2 meters to 17 meters and reduces the potential time for West Antarctic collapse to decadal time scales.

Until recently ice sheet models had problems to...