Sentences with phrase «based ice mass»

The extent of the ice in the Arctic has always been very uncertain but, through this work, we show how the sea ice in the Arctic Ocean developed before all the land - based ice masses in the Northern Hemisphere were established,» Jochen Knies explains.

The extent of the ice in the Arctic has always been very uncertain but, through this work, we show how the sea ice in the Arctic Ocean developed before all the land - based ice masses in the Northern Hemisphere were established,» Jochen Knies explains.

Not exact matches

Visitors can enter models of the explorers» base camps and view a computer map of Antarctica outlining the ocean currents around the continent and the land masses and mountains that lie hidden beneath the ice.

The results now published in Environmental Research Letters seem to contradict the data from a satellite mission based on other measuring methods, which indicates a slight increase in mass in the glacier ice for an almost identical period of time.

His comments are based on the paper «Limits in detecting acceleration of ice sheet mass loss due to climate variability», B. Wouters, J. L. Bamber, M. R. van den Broeke, J. T. M. Lenaerts and I. Sasgen, Nature Geoscience 6, 613 — 616 (2013) doi: 10.1038 / ngeo1874 Find the abstract and illustrations for that paper here.

However, if the remaining ice shelf collapses or starts losing mass more rapidly, it could effectively unplug the glaciers next to the shelf, sending land - based ice into Southern Ocean, and contributing to sea level rise.

That estimate was based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid change of ice sheet mass balance over the past few decades [23] and Greenland and Antarctica now losing mass at accelerating rates [23]--[24].

Meltwater reaches the base of ice sheets through basal melting from geothermal heating and by ice melting under pressure from the weight of the ice mass above.

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Our modelled values are consistent with current rates of Antarctic ice loss and sea - level rise, and imply that accelerated mass loss from marine - based portions of Antarctic ice sheets may ensue when an increase in global mean air temperature of only 1.4 - 2.0 deg.

Overall, I estimate the mass balance of the Greenland ice sheet to be about -80 + / -10 cubic km of ice per year in 2000 and -110 + / -15 cubic km of ice per year in 2004, i.e. more negative than based on partial altimetry surveys of the outlet glaciers.

About 200 ZJ added to climate over the 35 years (1971 - 2006) based on temperatures and lost ice mass.

However, the idea is simple, and I've talked about this much in many presentations this winter: Take the amount of ice you need to get rid of from Greenland to raise sea level 2 m in the next century, reduce it by your best estimate of the amount that would be removed by surface mass balance losses, and try to push the rest out of the aggregate cross-sectional area of Greenland's marine - based outlet glaciers.

The contribution from glaciers and ice caps (not including Greenland and Antarctica), on the other hand, is computed from a simple empirical formula linking global mean temperature to mass loss (equivalent to a rate of sea level rise), based on observed data from 1963 to 2003.

We know from satellite measurements that the Greenland and West Antarctic ice sheets (GIS and WAIS respectively) are losing mass in response to global warming, and that, in the case of the partly sea - based West Antarctica ice - sheet, basal melting of the ice by warmer ocean - water is likely to be a key mechanism.

We quantify sea - level commitment in the baseline case by building on Levermann et al. (10), who used physical simulations to model the SLR within a 2,000 - y envelope as the sum of the contributions of (i) ocean thermal expansion, based on six coupled climate models; (ii) mountain glacier and ice cap melting, based on surface mass balance and simplified ice dynamic models; (iii) Greenland ice sheet decay, based on a coupled regional climate model and ice sheet dynamic model; and (iv) Antarctic ice sheet decay, based on a continental - scale model parameterizing grounding line ice flux in relation to temperature.

I would suggest that a new proxy for heat being stored (or lost) from the Earth climate system be developed based on Total System Enthalpy, using a combination of moist enthalpy in the troposphere (after Pielke Sr.), ocean heat content, and total ice mass on the planet.

The only comprehensive study of the Antarctic Ice Sheet mass was a 10 + year study based on continuous 24/365 satellite measurements over the period 1993 to 2003, covering 80 % of the AIS with estimates from other methods for the remaining 20 %, which can not be measured by satellites (coastal areas and polar regions).

Both the observations of mass balance and the estimates based on temperature changes (Table 11.4) indicate a reduction of mass of glaciers and ice caps in the recent past, giving a contribution to global - average sea level of 0.2 to 0.4 mm / yr over the last hundred years.

Not sure what this means, but if you are looking for data on ice mass then I know that there are gravity - based estimates of ice mass, which would automatically correct for cavities in the ice.

Pokrovsky predicts a further acceleration of melting of the thin ice and in general greater ice loss compared to his June prediction; this change is based on the increase in the sea surface temperature (SST) anomalies in the North Atlantic and the presence of hot air masses over Siberia and the Russian Arctic.

Ancillary to Bob Loblaw's fine comment at 232, previous research has shown that ice sheet mass contributions from land - based ice sheets have exceeded thermal expansion as the biggest contributor to global sea level rise.

Interestingly, previous research has shown that ice sheet mass contributions from land - based ice sheets have exceeded thermal expansion as the biggest contributor to global sea level rise.

Here, considerable value can be derived from ship - based observations, aerial overflights, and drifting (mass - balance) buoys that provide a more accurate picture of the distribution of different ice types.

The earlier study reported that the region was losing three times this amount of ice, based on measurements of glacier thinning and mass loss determined from other satellite measurements.

Recent observations of unpredicted, local acceleration and consequent loss of mass from both ice sheets (Alley et al., 2005) underscores the inadequacy of existing ice - sheet models, leaving no generally agreed basis for projection, particularly for WAIS (Lemke et al., 2007 Section 4.6.3.3; Meehl et al., 2007 Sections 10.6.4.2 and 10.7.4.4; Vieli and Payne, 2005).

And in Greenland, the ice sheet continued to lose mass this year, as it has for every year since satellite - based measurements began there in 2002, according to the report.

How «small» that is would depend on the total mass and area of the land based ice.

That estimate was based in part on the fact that sea level is now rising 3.2 mm / yr (3.2 m / millennium)[57], an order of magnitude faster than the rate during the prior several thousand years, with rapid change of ice sheet mass balance over the past few decades [23] and Greenland and Antarctica now losing mass at accelerating rates [23]--[24].

Here we use a high - resolution regional glaciation model, developed by coupling physics - based ice dynamics with a surface mass balance model, to project the fate of glaciers in western Canada.

There is also no basis on which to postulate significant change in ice mass for those epochs.

In fact, there are now well over 150 individual assessments of ice sheet mass balance based on measurements acquired by at least 15 different satellite missions.

Jim D, according to Zwally based on IceSat Antarctica is not losing, and may be gaining, ice mass.

Glacier - A mass of land ice that flows downhill under gravity (through internal deformation and / or sliding at the base) and is constrained by internal stress and friction at the base and sides.

Hansen and Sato (7) argue that the climate of the most recent few decades is probably warmer than prior Holocene levels, based on the fact that the major ice sheets in both hemispheres are presently losing mass rapidly (9) and global sea level is rising at a rate of more than 3 m / millennium (25), which is much greater than the slow rate of sea level change (less than 1 m / millennium) in the latter half of the Holocene (26).

Studies based on satellite observations do not provide unequivocal evidence concerning the mass balance of the East Antarctic ice sheet; some appear to indicate marginal thickening (Davis et al., 2005), while others indicate little change (Zwally et al., 2005; Velicogna and Wahr, 2006; Wingham et al., 2006).

Manufactured in a clear polycarbonate to offer protection with an out - of - sight look, these devices are attached to sloped roofing surfaces, and are designed to prevent mass quantities of snow and ice from avalanching off of the roof, says Michael Pietrzak, technical sales coordinator for the Feasterville, Pa. - based company.