Sentences with phrase «of ice mass balance»

The most recent calculations of ice mass balance in the antarctic also do indicate loss of ice, though nothing close to the changes seen in the arctic sea ice and Greenland ice sheet.

Can you tell me if either of these phenomena are unusual and, if so, whether such processes are accurately reflected in current estimates of ice mass balance, or whether they, too, suggest an underestimate.

Not exact matches

Understanding sea level change in relation to the mass balance of Greenland's and Antarctica's ice sheets is at the heart of the CReSIS mission.

«What we found was that during most of the deglaciation, the surface mass balance of the Laurentide Ice Sheet was generally positive,» Ullman said.

David Ullman, a postdoctoral researcher at Oregon State University and lead author on the study, said there are two mechanisms through which ice sheets diminish — dynamically, from the jettisoning of icebergs at the fringes, or by a negative «surface mass balance,» which compares the amount of snow accumulation relative to melting.

Complementary analyses of the surface mass balance of Greenland (Tedesco et al, 2011) also show that 2010 was a record year for melt area extent... Extrapolating these melt rates forward to 2050, «the cumulative loss could raise sea level by 15 cm by 2050 ″ for a total of 32 cm (adding in 8 cm from glacial ice caps and 9 cm from thermal expansion)- a number very close to the best estimate of Vermeer & Rahmstorf (2009), derived by linking the observed rate of sea level rise to the observed warming.

Subtracting one from the other produced a «mass - balance» picture of net ice loss or growth for each ice sheet.

The IceCon project [8] is investigating Antarctic ice mass balance - the rate of loss of ice from the continent.

The relevant papers are [Velicogna and Wahr 2006 Measurements of time - variable gravity show mass loss in Antarctica Science 311, 1754 - 1756 and Rignot and Thomas «Mass balance of polar ice sheets» Science 297, 1502 - 1506]

A pair of satellites (GRACE) were launched several years ago to determine mass balance in the Antarctic and Greenland ice sheets.

Shabtaie, S., and C.R. Bentley, West Antarctic ice streams draining into the Ross Ice Shelf: configuration and mass balance, Journal of Geophysical Research, Vice streams draining into the Ross Ice Shelf: configuration and mass balance, Journal of Geophysical Research, VIce Shelf: configuration and mass balance, Journal of Geophysical Research, Vol.

Nicolas Bergeot from the Royal Observatory of Belgium talks about the interesting research on ice mass balance and Earth's geomagnetic field he and his colleagues are carrying out at the Princess Elisabeth Antarctica research station.

Detailed net mass balance of the ice plain on Ice Stream B, Antarctica: A GIS Approach, Journal of Glaciology, Vice plain on Ice Stream B, Antarctica: A GIS Approach, Journal of Glaciology, VIce Stream B, Antarctica: A GIS Approach, Journal of Glaciology, Vol.

«Geodetic measurements of vertical crustal velocity in West Antarctica and the implications for ice mass balance.»

Jacobs SS, Hellmer HH, Doake, CSM, Jenkins A, Frolich RM (1992) Melting of ice shelves and the mass balance of Antarctica.

Mitrovica, J. X., Tamisiea, M. E., Davis, J. L. & Milne, G. A. Recent mass balance of polar ice sheets inferred from patterns of global sea - level change.

Nicolas Bergeot from the Royal Observatory of Belgium talks about the interesting research on ice mass balance and Earth's geomagnetic field he and his colleagues are carrying out...

Negative mass balances on tributary glaciers can lead to thinning of the glaciers and ice shelves.

Ice shelves are important, because they play a role in the stability of the Antarctic Ice Sheet and the ice sheet's mass balance, and are important for ocean stratification and bottom water formation; this helps drive the world's thermohaline circulatiIce shelves are important, because they play a role in the stability of the Antarctic Ice Sheet and the ice sheet's mass balance, and are important for ocean stratification and bottom water formation; this helps drive the world's thermohaline circulatiIce Sheet and the ice sheet's mass balance, and are important for ocean stratification and bottom water formation; this helps drive the world's thermohaline circulatiice sheet's mass balance, and are important for ocean stratification and bottom water formation; this helps drive the world's thermohaline circulation.

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].

Isabella Velicogna can use that information to «study the mass balance of the Greenland and Antarctic Ice Sheets and glaciers worldwide, in response to climate warming.»

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.

The mass - balance of the whole greenland ice - sheet was estimated to be the following:

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.

[Response: Rain on the flanks is not that uncommon, but enough rain on the bulk of the ice sheet to affect the surface mass balance as much as you suggest is not on.

So I had to back up the story of my trip to Alaska with satellite data on sea ice, and I had to justify my pictures of disappearing glaciers in the Andes with long - term records of mass balance of mountain glaciers.

The relevant papers are [Velicogna and Wahr 2006 Measurements of time - variable gravity show mass loss in Antarctica Science 311, 1754 - 1756 and Rignot and Thomas «Mass balance of polar ice sheets» Science 297, 1502 - 1506]

A pair of satellites (GRACE) were launched several years ago to determine mass balance in the Antarctic and Greenland ice sheets.

Eric Rignot most recent work in 2008 supported a larger, accelerating contribution of Antarctica's ice mass balance to the rise in sea level.

We have joined forces with the Greenland expert Jason Box who has reconstructed the mass balance of the Greenland ice sheet since 1840 (Fig. 6 of our paper, see also his blog).

If a negative surface mass balance were sustained for millennia, that would lead to virtually complete elimination of the Greenland ice sheet and a resulting contribution to sea level rise of about 7 m.

One has to delve deeply into the appendix of Chapter 11 of the TAR to find out what these extra 18 cm entail: they include a «mass balance uncertainty» and an «ice dynamic uncertainty», where the latter is simply assumed to be 10 % of the total computed mass loss of the Greenland ice sheet.

Shepherd et al. (2012) estimate the mass balance of the entire Antarctic Ice Sheet to be -81 ± 37 gigatonnes per year.

The findings reinforce suggestions that strong positive ice — temperature feedbacks have emerged in the Arctic15, increasing the chances of further rapid warming and sea ice loss, and will probably affect polar ecosystems, ice - sheet mass balance and human activities in the Arctic...» *** This is the heart of polar amplification and has very little to do with your stated defintion of amplifying the effects of warming going on at lower latitudes.

Postscript: A grouping of 40 + scientists, including four of our Nature co-authors, participated in the NASA / ESA Ice Sheet Mass Balance Intercomparison project (IMBIE) in an attempt to understand the reasons for previously disparate ice mass change estimatIce Sheet Mass Balance Intercomparison project (IMBIE) in an attempt to understand the reasons for previously disparate ice mass change estimatice mass change estimates.

The most recent ice data, 10 June 2013, from a SAMS ice mass balance buoy installed in the fast ice in Inglefieldbukta (N 77 ° 54», E 18 ° 17») reported an ice thickness of about 88 cm and snow depth 20 cm.

The software developed will combine individual assessments of ice sheet mass balance to determine a reconciled estimate of ice sheet mass balance, taking into account the spatial and temporal domain of the input data and their uncertainties, and generate summary graphical and tabulated output.

Because ice sheets contain so much ice and have the potential to raise or lower global sea level so dramatically, measuring the mass balance of the ice sheets and tracking any mass balance changes and their causes is very important for forecasting sea level rise.

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.

Then in 2003 the launch of two new satellites, ICESat and GRACE, led to vast improvements in one of the methods for mass balance determination, volume change, and introduced the ability to conduct gravimetric measurements of ice sheet mass over time.

At the beginning of the 1990s, scientists were unsure of the sign (positive or negative) of the mass balance of Greenland or Antarctica, and knew only that it could not be changing rapidly relative to the size of the ice sheet.

A key area of glaciological study in recent years is ice sheet mass balance.

The impacts of ice shelf collapse and ensuing glacier acceleration are substantial, but in general, the effects of ocean melt are proving to be far more important in controlling ice sheet mass balance.

Because Antarctica drains more than 80 percent of its ice sheet through floating ice shelves, accelerated glacier flow has the potential to affect ice sheet mass balance dramatically and raise sea level (Pritchard et al. 2012).

So the 2016 - 2017 Surface Mass Balance of approximately 550 Gt yr ^ -1 may seem to have caused a positive ice sheet mass balancBalance of approximately 550 Gt yr ^ -1 may seem to have caused a positive ice sheet mass balancebalance (MB).

Annual net balance on eight North Cascades glaciers during the 1984 - 1994 period has been determined by measurement, of total mass loss from firn and ice melt and, of residual snow depth at the end of the summer season.

Given enough time, a negative net mass balance will ultimately lead to complete melting of the ice sheet, and several studies have attempted to quantify the climatic threshold and time period required for this to happen.

«A high - resolution record of Greenland mass balance» «Antarctica, Greenland and Gulf of Alaska land - ice evolution from an iterated GRACE global mascon solution» «Greenland and Antarctica ice sheet mass changes and effects on global sea level»

DMI says, The surface mass balance is calculated over a year from September 1st to August 31st (the end of the melt season) For the 2016 - 17 SMB year, which ended yesterday, the ice sheet had gained 544bn tonnes of ice, compared to an average for 1981 - 2010 of 368bn tonnes.

(2012), Ice volume and subglacial topography for western Canadian glaciers from mass balance fields, thinning rates, and a bed stress model: Journal of Climate, doi: 10.1175 / JCLI - D -12-00513.1.