Sentences with phrase «ice sheet model pism»

The same group of authors looked at this in two ways, using NCAR's Community Climate System model (CCSM) coupled to a state - of - the - art 3 - D ice sheet model.

Hansen & Sato [60] point out the sudden change in the responsiveness of the ice sheet model of Bintanja et al. [59] when the sea level reaches today's level (figs 3 and 4 of Hansen & Sato [60]-RRB- and they note that the empirical sea - level data provide no evidence of such a sudden change.

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.

We find the Pliocene sea level varying between about +20 m and − 50 m, with the Early Pliocene averaging about +15 m; the ice sheet model has a less variable sea level with the Early Pliocene averaging about +8 m.

Our estimated sea levels have reached +5 to 10 m above the present sea level during recent interglacial periods that were barely warmer than the Holocene, whereas the ice sheet model yields maxima at most approximately 1 m above the current sea level.

Robert DeConto and David Pollard - climate scientists from the University of Massachusetts Amherst and Pennsylvania State University, respectively - used a three - dimensional ice sheet model to reconstruct the Earth as it looked during the Pliocene 3 million years ago.

The researchers then ran their ice sheet model to simulate how the glaciers responded to global temperature rise under a medium - high emissions scenario.

A. Robinson, R. Calov, and A. Ganopolski Greenland ice sheet model parameters constrained using simulations of the Eemian Interglacial Clim.

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.

Rather than use an ice sheet model to estimate rates of freshwater release, we use observations for the present ice melt rate and specify several alternative rates of increase of ice melt.

These authors use an ice sheet model within a Bayesian statistical framework — in which critical processes are guided by expert synthesis — to simulate the mass loss from the entire Antarctic ice sheet to 2200.

Together with the University of Alaska, PIK develops the Parallel Ice Sheet Model (PISM), an innovative computer model of continental ice sheet dynamics.

We used an ensemble of ice sheet model runs and plausible Earth models to place bounded constraints on our mass change estimate.

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 uncertainty is illustrated by Pollard et al. (2015), who found that addition of hydro - fracturing and cliff failure into their ice sheet model increased simulated sea level rise from 2 m to 17 m, in response to only 2 °C ocean warming and accelerated the time for substantial change from several centuries to several decades.»

These simulations were subsequently used as forcing of an 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.

Gallée, H., et al., 1991: Simulation of the last glacial cycle by a coupled, sectorally averaged climate — ice sheet model.

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

The researchers then ran their ice sheet model to simulate how the glaciers responded to global temperature rise under a medium - high emissions scenario.

A new study combines the latest observations with an ice sheet model to estimate that melting ice on the Antarctic ice sheet is likely to add 10 cm to global sea levels by 2100, but it could be as much as 30 cm.

Joughin et al. (2010) applied a numerical ice sheet model to predicting the future of PIG, their model suggested ongoing loss of ice mass from PIG, with a maximum rate of global sea level rise of 2.7 cm per century.

Inputs needed for a typical Antarctic ice sheet model are the elevation of the bed beneath the ice sheet, air temperature, snowfall and the heat input from the rock below (geothermal heat flux).

What is an ice sheet model?

The researchers then ran their ice sheet model to simulate how the glaciers responded to global temperature rise under a

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.

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

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

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.

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.

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.

The international team of co-authors, led by Peter Clark of Oregon State University, generated new scenarios for temperature rise, glacial melting, sea - level rise and coastal flooding based on state - of - the - art climate and ice sheet models.

«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.

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

Indeed, many numerical ice sheet models of Greenland assume that a uniform value of geothermal heat flux exists everywhere across Greenland.

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

Researchers used geologic evidence and ice sheet models to construct a timeline of the Cordilleran's advance and retreat.

«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.

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.»

Late Quaternary deglaciation of the Amundsen Sea: Implications for ice sheet modeling.

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.

170 (Symposium on Physical Basis of Ice Sheet Modelling, Vancouver), p. 313 - 322, 1987.

Ice sheet models can be run through many glacial cycles (i.e. cold glacial periods and warm interglacial periods).

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

In The Physical Basis of Ice Sheet Modelling, pp. 81 - 91.

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.

They also speak about sea level sensitivity as being higher than current ice sheet models show.

It seems about 500 ppm CO2 could eventually mean an ice free planet, much lower than the circa 1000 ppm that ice sheet models seem to estimate.

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