Sentences with phrase «ice sheet behavior in»

GPS and seismic measurements together provide a means to answer critical questions about ice sheet behavior in a warming world.

Not exact matches

Impacts of thermal expansion and melting mountain glaciers can be predicted with moderate confidence, but more uncertainty remains in the potential behavior of polar ice sheets.

But, rapid change in the behavior of parts of the Antarctic ice sheet might cause much greater rise than is often included in coastal planning.

The plume has been a factor in the ice sheet's behavior throughout its history, and recent surges in melting are the result of all the additional heat humans have pumped into it.

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.

«Incorporating all of these uncertainties is daunting, largely because of the computational challenges involved,» and to an extent, «whatever we say about the behavior of ice sheets in the future is necessarily imperfect,» note the authors.

Evidence of past glacial advance and retreat is also more easily observed in the Dry Valleys, providing a window into the past behavior of the vast Antarctic ice sheets and their influence on global sea levels.

«The past behavior and dynamics of the Antarctic ice sheets are among the most important open questions in the scientific understanding of how the polar regions help to regulate global climate,» said Jennifer Burns, director of the NSF Antarctic Integrated Science System Program.

The findings, published yesterday in the journal Science, suggest scientists still have much to learn about the factors that govern the behavior of ice sheets — knowledge that is crucial to developing more accurate projections of future sea level rise.

«We see processes that operate in the climate system that either don't operate in glacial times we've seen in the last 2 million years, or they operate very differently,» she said, citing the behavior of ice sheets as an example.

This in turn will provide a means to answer critical questions about the ice sheet's behavior in a warming world.

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.

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.

Anandakrishnan, S., R.B. Alley, R.W. Jacobel and H. Conway, The flow regime of ice stream C and hypotheses concerning its recent stagnation, in R.B. Alley and R.A. Bindschadler, eds., The West Antarctic Ice Sheet: Behavior and Environment, American Geophysical Union, Antarctic Research Series, v. 77, p. 283 - 296 (200ice stream C and hypotheses concerning its recent stagnation, in R.B. Alley and R.A. Bindschadler, eds., The West Antarctic Ice Sheet: Behavior and Environment, American Geophysical Union, Antarctic Research Series, v. 77, p. 283 - 296 (200Ice Sheet: Behavior and Environment, American Geophysical Union, Antarctic Research Series, v. 77, p. 283 - 296 (2001).

«These are two of the largest and most rapidly changing glaciers in Antarctica, so the potential for their evolution to influence each other is important to consider in modeling ice sheet behavior and projecting future sea level rise,» Dustin Schroeder, a Stanford geophysicist who led the study, told Earther.

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.

We have a pretty good idea that the Heinrich events, with the most prominent bipolar seesaw behavior, are linked to ice - sheet behavior, but we're less confident about the non-Heinrich cold phases of the D / O oscillations (the cold phases do have more ice - rafted debris in these non-Heinrich cold - phases than in warm phases, but is that an ice - dynamical signal, a survival - of - icebergs signal, or something else?).

Nonetheless, a recent probabilistic assessment based on IPCC projections and expert elicitations on ice sheet behavior assigns a 0.5 % chance that global SLR will exceed 6.3 m by 2200 under RCP 8.5 (46), suggesting that all but the highest committed levels discussed here could be attained in the relatively near term.

Studies of this kind, which explore the ice sheet's past behavior, are critical to developing better predictions of how it will evolve in the future, Csatho says.

«The novel aspect of our study is that we discover biological processes play an important role in ice sheet behavior,» Stibal said.

We need greater attention on the strength of uncertain processes and feedbacks in the physical climate system (e.g. carbon cycle feedbacks, ice sheet dynamics)(NRC 2013), as well as on institutional and behavioral feedbacks associated with energy production and consumption, to determine scientifically plausible bounds on total warming and the overall behavior of the climate system (Heal and Millner 2014).

They ran a climate model to take account of variations in sunlight and the rise and fall of CO2, then took snapshots from this model and fed them into a model for ice - sheet behavior and fed the result back into their climate model.

In understanding the behavior of ice sheets, attention is particularly focused on the boundary between the floating ice and grounded ice, which is usually called the grounding line, although in detail it is a zone with interesting but imperfectly understood properties (e.g., Schoof, 2007; Joughin et al., 2012a; Walker et al., 2013); see Figure 2.In understanding the behavior of ice sheets, attention is particularly focused on the boundary between the floating ice and grounded ice, which is usually called the grounding line, although in detail it is a zone with interesting but imperfectly understood properties (e.g., Schoof, 2007; Joughin et al., 2012a; Walker et al., 2013); see Figure 2.in detail it is a zone with interesting but imperfectly understood properties (e.g., Schoof, 2007; Joughin et al., 2012a; Walker et al., 2013); see Figure 2.7.

Dr. Alley teaches, and conducts research on the climatic records, flow behavior, and sedimentary deposits of large ice sheets, to aid in prediction of future changes in climate and sea level.

«There's been a lot of speculation about the stability of marine ice sheets, and many scientists suspected that this kind of behavior is under way,» Ian Joughin, a glaciologist at the University of Washington in Seattle, said in a news release about one of the studies published Monday.

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.