Sentences with phrase «of global ice volume»

These records provide both a direct measure of sea level and an indirect measure of global ice volume.

Gerard Roe (U. Washington) showed that the rate of change of global ice volume correlates beautifully with the changes in incoming solar radiation due to Milankovitch cycles (Roe, 2006).

The fact that our model does a surprisingly good job with simulating the last 400,000 years of global ice volume, with no change in model physics and only one linear change in boundary conditions, argues for the fact that, despite plausible deficiencies, we have done a surprisingly good job of simulating the pattern of fluctuations in ice volume.

Except that we do make an attempt to validate the model with respect to how it has performed against the best estimate of global ice volume we have — Shackleton's 2000 record (I might add that I am not sure of any other modeling study that has tried to validate itself against the Shackleton record).

However, atmospheric CO2 content plays an important internal feedback role.Orbital - scale variability in CO2 concentrations over the last several hundred thousand years covaries (Figure 5.3) with variability in proxy records including reconstructions of global ice volume (Lisiecki and Raymo, 2005), climatic conditions in central Asia (Prokopenko et al., 2006), tropical (Herbert et al., 2010) and Southern Ocean SST (Pahnke et al., 2003; Lang and Wolff, 2011), Antarctic temperature (Parrenin et al., 2013), deep - ocean temperature (Elder eld et al., 2010), biogeochemical conditions in the Northet al., 2008).

Building on this study, the team intend to produce a new reconstruction of global ice volume across the last glacial cycle, which will help to validate their proposition that certain boundaries can define windows of instability within the climate system.

Not exact matches

In a study published in the actual volume of Nature Communications, geo - and climate researchers at the Alfred - Wegener Institute, Helmholtz Centre for Polar - and Marine Research (AWI) show that, in the course of our planet's history, summertime sea ice was to be found in the central Arctic in periods characterised by higher global temperatures — but less CO2 — than today.

In some sense, the search for a theory of glacial - interglacial cycles amounts to a search for the «rectifier» which turns the modulation of the amplitude of the seasonal forcing into a rectified signal in global ice volume.

What is alarming is that the volume of water and the extent and rapidity of its movement is suprisingly much greater than previously believed, and that a possible, perhaps likely, effect of this on ice sheet dynamics is to make the ice sheets less stable and more likely to respond more quickly to global warming than previously expected.

Abstract: Mid - to late - Holocene sea - level records from low - latitude regions serve as an important baseline of natural variability in sea level and global ice volume prior to the Anthropocene.

The stack of 57 globally distributed benthic δ18O marine records (dark grey), a proxy for global ice volume fluctuations (Lisiecki and Raymo, 2005), is displayed for comparison with the ice core data.

Global warming induced by increasing CO2 will cause ice to melt and hence sea level to rise as the global volume of ice moves toward the quasi-equilibrium amount that exists for a given global temperatureGlobal warming induced by increasing CO2 will cause ice to melt and hence sea level to rise as the global volume of ice moves toward the quasi-equilibrium amount that exists for a given global temperatureglobal volume of ice moves toward the quasi-equilibrium amount that exists for a given global temperatureglobal temperature [53].

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If one takes the simple view that deglaciation is forced by only global ice volume change and greenhouse feedbacks, then one would be forced to conclude that Antarctic temperature change led all of its forcings!

Global climate model projections (in CMIP3 at least) appear to underestimate sea ice extent losses with respect to observations, though this is not universally true for all models and some of them actually have ensemble spreads that are compatible with PIOMAS ice volume estimates and satellite observations of sea ice extent.

A second application of salinity is to diagnose the global volume of ice.

Volume gives us an idea on how much freshwater is stored in Arctic sea ice — an important element in the global - Arctic hydrological cycle, i.e., the cycle of distillation due to freezing, and subsequent export, and melt.

There are certainly better indicators of global warming trends — ice sheet volume, sea ice extent and sea surface temperatures all come to mind — but hurricanes get people's attention.

The volume of water unleashed by the melting ice raised global sea levels by close to 2 one - hundredths of an inch; were all of Greenland's ice to melt, Steffen predicts, sea levels could be lifted by as much as 21 ft - an unlikely possibility.

On decadal and longer time scales, global mean sea level change results from two major processes, mostly related to recent climate change, that alter the volume of water in the global ocean: i) thermal expansion (Section 5.5.3), and ii) the exchange of water between oceans and other reservoirs (glaciers and ice caps, ice sheets, other land water reservoirs - including through anthropogenic change in land hydrology, and the atmosphere; Section 5.5.5).

For instance, if global warming were to increase the volume of water in the oceans by causing glaciers or other ice bodies to melt, this would cause the weight of water in the oceans to increase.

For instance, here's the data for delta - oxygen - 18 from a stack of 57 ocean sediment cores, which is considered an excellent proxy for global ice volume, known as the «LR04 stack» (from Lisiecki, L.E., & Raymo, M.E. 2005.

Its estimated ice volume and contribution to mean global sea level reside well within their ranges of natural variability, and from the current looks of things, they are not likely to depart from those ranges any time soon.

«Nonetheless, Jacob and colleagues have dramatically altered our understanding of recent global (glacier and ice cap) volume changes, and their contribution to sea - level rise,» Bamber wrote, referring to study researcher Thomas Jacob of Colorado - Boulder.

The most valuable information on rates of SLR comes from periods when global ice volumes were similar to present.

From historic droughts around the world and in places like California, Syria, Brazil and Iran to inexorably increasing glacial melt; from an expanding blight of fish killing and water poisoning algae blooms in lakes, rivers and oceans to a growing rash of global record rainfall events; and from record Arctic sea ice volume losses approaching 80 percent at the end of the summer of 2012 to a rapidly thawing permafrost zone explosively emitting an ever - increasing amount of methane and CO2, it's already a disastrous train - wreck.

- Why have comparable warm water currents not appeared in the Southern Hemisphere, under the influence of the global warming, to reduce Antarctic sea ice / ice Volume as it has in the Arctic?

This huge volume of ice lowered global sea level by around 120 meters as compared to today.

«Time periods with less than twice the modern global ice volume show almost no indications of sea level rise faster than about 2 metres per century,» said Dr Grant.

All of these characteristics (except for the ocean temperature) have been used in SAR and TAR IPCC (Houghton et al. 1996; 2001) reports for model - data inter-comparison: we considered as tolerable the following intervals for the annual means of the following climate characteristics which encompass corresponding empirical estimates: global SAT 13.1 — 14.1 °C (Jones et al. 1999); area of sea ice in the Northern Hemisphere 6 — 14 mil km2 and in the Southern Hemisphere 6 — 18 mil km2 (Cavalieri et al. 2003); total precipitation rate 2.45 — 3.05 mm / day (Legates 1995); maximum Atlantic northward heat transport 0.5 — 1.5 PW (Ganachaud and Wunsch 2003); maximum of North Atlantic meridional overturning stream function 15 — 25 Sv (Talley et al. 2003), volume averaged ocean temperature 3 — 5 °C (Levitus 1982).

The global decline in glacial and ice - sheet volume is predicted to be one of the largest contributors to global sea level rise during this century (Ch.

Global warming induced by increasing CO2 will cause ice to melt and hence sea level to rise as the global volume of ice moves toward the quasi-equilibrium amount that exists for a given global temperatureGlobal warming induced by increasing CO2 will cause ice to melt and hence sea level to rise as the global volume of ice moves toward the quasi-equilibrium amount that exists for a given global temperatureglobal volume of ice moves toward the quasi-equilibrium amount that exists for a given global temperatureglobal temperature [53].

We use realistic estimates of mass redistribution from ice mass loss and land water storage to quantify the resulting ocean bottom deformation and its effect on global and regional ocean volume change estimates.

Uncertainties in the timing of ice - margin retreat and global ice - volume change allow a variety of plausible deglaciation triggers.

John Imbrie used time - series analysis to statistically compare the timing and cycles in the sea surface temperature and global ice volume records with patterns of the Earth's orbit.

Estimates of ice volume in northern hemisphere permafrost range from 1.1 to 3.7 x1013 m3 (Zhang et al., 1999), equivalent to 0.03 to 0.10 m of global - average sea level.

«Every piece of valid evidence â $» long - term temperature averages that smooth out year - to - year fluctuations, Arctic sea ice volume, melting of glaciers, the ratio of record highs to record lows â $» points to a continuing, and quite possibly accelerating, rise in global temperatures.

The two - day FAMOS workshop will include sessions on 2017 sea ice highlights and sea ice / ocean predictions, reports of working groups conducting collaborative projects, large - scale arctic climate modeling (ice - ocean, regional coupled, global coupled), small (eddies) and very small (mixing) processes and their representation and / or parameterization in models, and new hypotheses, data sets, intriguing findings, proposals for new experiments and plans for 2018 FAMOS special volume of publications.

And since we have had rising sea level over last couple centuries, and this generally indicates warming global ocean volume, I expect this trend to continue for the next century [most likely] and due to warming oceans continuation of tread of less polar sea ice.

Record droughts in many areas of the world, the loss of arctic sea ice — what you see is an increasing trend that is superimposed on annual variablity (no bets on what happens next year, but the five - to - ten year average in global temperatures, sea surface temperatures, ocean heat content — those will increase — and ice sheet volumes, tropical glacier volumes, sea ice extent will decrease.

In some sense, the search for a theory of glacial - interglacial cycles amounts to a search for the «rectifier» which turns the modulation of the amplitude of the seasonal forcing into a rectified signal in global ice volume.

What is alarming is that the volume of water and the extent and rapidity of its movement is suprisingly much greater than previously believed, and that a possible, perhaps likely, effect of this on ice sheet dynamics is to make the ice sheets less stable and more likely to respond more quickly to global warming than previously expected.