All processes by which mass is removed from a glacier or ice sheet mass gained mass lost aoss 605 004 specific mass balance mass balance at a point in space units massareakg m. Enderlin3 1faculty of aerospace engineering, delft university of. Accelerated west antarctic ice mass loss continues to. The research was undertaken as part of the ice sheet mass balance intercomparison exercise. A reconciled estimate of ice sheet mass balance dataset url is not available. A test of recent inferences of net polar ice mass balance. Lowfrequency radar sounding of glaciers and ice sheets.
Mass balance of the greenland ice sheet from 1992 to 2018 nature. A reconciled estimate of icesheet mass balance researchgate. Here, we simulate the greenland ice sheet gris surface mass. A reconciled estimate of icesheet mass balance university of. All processes by which mass is added to a glacier or ice sheet ablation. Projecting antarcticas contribution to future sea level rise from. Satellite observations show polar ice shrinking 30112012. The above is the key figure from a new paper in science by shepherd et al, a reconciled estimate of icesheet mass balance. We combined an ensemble of satellite altimetry, interferometry, and gravimetry data sets using common geographical regions, time intervals, and models of surface mass balance and glacial isostatic adjustment to estimate the mass balance of earths polar ice sheets. A test of recent inferences of net polar ice mass balance based on longwavelength gravity. Launched in 2002 and operational until 2017, the gravity recovery and climate experiment grace was the only spaceborne sensor designed to directly observe mass redistribution. Increased ice losses from antarctica detected by cryosat. Observations of ice sheet elevation rates and velocity since the 20062008 epoch of our mass balance recalculation show changes in ice dynamics for the getz region of west antarctica.
A reconciled estimate of icesheet mass balance this copy is for your personal, noncommercial use only. We evaluate the state of the mass balance of the antarctic ice sheet over. Monitoring southwest greenlands ice sheet melt with. Satellite observations show polar ice shrinking gim. Contribution of working group i to the fourth assessment report of the intergovernmental panel on climate change. Here, we compare and combine estimates of ice sheet mass balance derived. Because this mass loss is associated with sealevel rise at a rate of 0.
Geodetic measurements reveal similarities between post. The greenland ice sheet presently accounts for 70% of global ice sheet mass loss. Icesatderived grounding zone for antarctic ice shelves. Simulate your whole plant from crushing through to flotation in one flowsheet. Icy contenders weigh in posted on 5 february 20 by jason box. Geodetic measurements reveal similarities between postlast glacial maximum and presentday mass loss from the greenland ice sheet. Here, we compare and combine estimates of ice sheet mass balance derived from all three satellite geodetic techniques, using common spatial and temporal domains, to investigate the extent to which the approaches concur and to produce a reconciled estimate of ice sheet mass balance. Previous observations of ice surface velocity indicate that the amery ice shelf and tributary glaciers have been relatively stable over the period 1968 to 1999. A reconciled estimate of icesheet mass balance dataset. This technique allows tracking reservoir pressure and fluid characteristics changes as a function of time, providing accurate well and field production forecast and a reserves estimate. The greenland ice sheet has been the largest land ice contributor to sea level rise in the past decade harig and simons, 2012. Mass balance of ice sheets in greenland, antarctica and patagonia combining satellite remote sensing techniques with other data. We use grace monthly measurements of timevariable gravity for the period january 2003 to december 20 to estimate the spatial pattern in ice mass balance dmtdt, and acceleration in mass balance d 2 mdt 2 for both greenland and antarctica at the regional and continental scale using a mascon approach.
Organization for scientific research, the netherlands polar program, the. Ice stream dynamics, ice ocean interaction, climate change. Mass balance reassessment of glaciers draining into the. As a reference, in purple color the 2012 ice sheet mass balance intercomparison exercise imbie mass balance estimate based on the gravity method, in green color the average of all methods applied and compared in are plotted. As outlined in the paper a reconciled estimate of ice sheet mass balance published today in science, the researchers carefully matched time periods and survey areas. As a consequence and to avoid extrapolation in the merged sec grid, we exclude all grid cells which are located on slopes exceeding 1. Reconstruction of the greenland ice sheet surface mass balance. Mass estimation techniques vary between groups, specifically in how they compensate for. We propose a new ice sheet model validation framework the cryospheric model comparison tool cmct that takes advantage of ice sheet altimetry and gravimetry observations collected over the past several decades and is applied here to modeling of the greenland ice sheet. It was constructed by combining aster and spot 5 dems over the ice sheet periphery and margin with avhrr photoclinometry for the interior and far north, and calibrating the data to approximate mean icesatglas elevations from 2003 to 2009. Enderlin3 1faculty of aerospace engineering, delft university of technology, delft, the netherlands.
Ice sheet mass balance from grace visualizations by cindy starr released on february 7, 2012 in the first comprehensive satellite study of its kind, a university of colorado boulderled team used nasa data to calculate how much earths melting land ice is adding to global sea level rise. Measures antarctic grounding line from differential satellite radar. Dec 03, 2012 the above is the key figure from a new paper in science by shepherd et al, a reconciled estimate of ice sheet mass balance. Science a reconciled estimate of icesheet mass balance. To answer this, we adopted a special, elastic case of our sea level software to compute the signal associated with uniform melting over. This paper presents the data reconciliation algorithm from an industrial point of view, through its use in computer applications such as computation of plant wide reconciled mass balance which forms the basis for the material accounting of a plant production. Pdf a reconciled estimate of icesheet mass balance. Since 1992, the polar ice sheets have contributed, on average, 0. The contemporary record of ice sheet mass balance has solidified significantly partly owing to the data gathered since 2002 by grace, the gravity recovery and climate experiment chen et al. Aug 22, 2016 the greenland ice sheet gris has been losing mass in recent decades, with an acceleration in mass loss since 2000. A team of 96 polar scientists from 50 international organisations have produced the most complete picture of greenland ice loss to date. Modeling and simulation of minerals processing with metsmart software. This data set consists of an enhanced resolution digital elevation model dem for the greenland ice sheet. Improved grace regional mass balance estimates of the greenland ice sheet crossvalidated with the inputoutput method zheng xu1, ernst j.
Reconciled ice sheet mass balance estimates determined during various epochs, inclusive of all data present during the given dates. A reconciled estimate of icesheet mass balance andrew. Its probably more meaningful to look at the right hand scale, which shows the total amount of sea level rise contribution, to date, from the melting of greenland blue, antarctica pink, and the two together. A 2012 study from an international research team 47 scientists from 26 research labs, including nasa published in the journal science, a reconciled estimate of icesheet mass balance, analyzes vast datasets compiled from three different satellite imaging methods and datagathering techniques to produce a comprehensive picture of. Here we compare and combine 26 individual satellite measurements of changes in the ice sheets volume, flow and gravitational potential to produce a reconciled estimate of. Fleming1 1british antarctic survey, natural environment research council, madingley road, cambridge cb3 0et, uk email. Mar 10, 2016 the greenland ice sheet has been the largest land ice contributor to sea level rise in the past decade harig and simons, 2012. Shepherd et al a reconciled estimate of icesheet mass balance, science 338, 2012. We use 26 estimates of ice sheet mass balance derived from satellite. Here we compare and combine 26 individual satellite measurements of changes in the ice sheet s volume, flow and gravitational potential to produce a reconciled estimate of its mass balance. Cryosat swath altimetry to measure ice cap and glacier surface. Icestream dynamics, iceocean interaction, climate change.
Jun, 2018 mass balance of the antarctic ice sheet from 1992 to 2017. While regional variability in ice dynamics has been revealed, a picture of mass changes throughout the continental ice sheet is lacking. The greenland ice sheet gris has been losing mass in recent decades, with an acceleration in mass loss since 2000. Cryosat swath altimetry to measure ice cap and glacier surface elevation change. Interim reanalysis to determine if these gris mass loss trends are linked to increases in moisture transport to greenland. Mass balance of the greenland ice sheet from 1992 to 2018. Evaluating the ability of process based models to project. Material balance, is an application of conservation of mass to gain a good understanding of reservoir and production systems which will lead to reliable simulation studies.
Ice mass loss in greenland, the gulf of alaska, and the. Improved grace regional mass balance estimates of the. Conventional radar altimetry struggles with mapping the margins of the greenland ice sheet due to the steep slopes characterizing this area. Nov 03, 2014 since 1992, the polar ice sheets have contributed, on average, 0. Monitoring the rate of ice flow into ice shelves is vital to understanding how, where and when mass changes occur in antarctica. Jun 22, 2011 until quite recently, the mass balance mb of the great ice sheets of greenland and antarctica was poorly known and often treated as a residual in the budget of oceanic mass and sea level change. Dec 10, 2019 here we compare and combine 26 individual satellite measurements of changes in the ice sheets volume, flow and gravitational potential to produce a reconciled estimate of its mass balance. Until quite recently, the mass balance mb of the great ice sheets of greenland and antarctica was poorly known and often treated as a residual in the budget of oceanic mass and sea level change. Global warming skeptics must see, chasing ice priuschat. If you wish to distribute this article to others, you can order highquality copies for your following the guidelines here. A reconciled estimate of icesheet mass balance science. The expert group on ice sheet mass balance and sea level ismass aims to promote research on the estimation of the mass balance of ice sheets and its contribution to sea level, facilitate coordination among the different international efforts focused in this field. A reconciled estimate of ice sheet mass balance 2012 authors.
Recent developments in regional climate modelling and remote sensing, especially altimetry, gravimetry and insar feature tracking, have enabled us to specifically resolve the ice sheet mass balance. Dec 06, 2012 a 2012 study from an international research team 47 scientists from 26 research labs, including nasa published in the journal science, a reconciled estimate of icesheet mass balance, analyzes vast datasets compiled from three different satellite imaging methods and datagathering techniques to produce a comprehensive picture of. We find that there is good agreement between different satellite methodsespecially in greenland and west antarcticaand. Mass balance of the antarctic ice sheet from 1992 to 2017. 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. Giant atmospheric rivers add mass to antarcticas ice sheet. The mass balance of west antarctica is dominated by dynamic losses from the amundsen sea sector, and dynamic gains from the kamb ice stream 8. A reconciled estimate of icesheet mass balance dataset url is not available. Nov 23, 2016 a reconciled estimate of ice sheet mass balance dataset url is not available. To produce a reconciled ice sheet mass balance estimate, we comp uted the average rate of mass change derived from each of the geodetic techniqu es, within the various reg ions of interest, and. Applying different vader filter strengths, very similar mass trend results are achieved for the antarctic peninsula. Search a portfolio of accounting software with balance sheet functionality. Recent developments in regional climate modelling and remote sensing, especially altimetry, gravimetry and insar feature tracking, have enabled us to specifically resolve the ice sheet mass. Mass balance of the antarctic ice sheet, wingham et al.
And atmospheric sciences program, department of geography the. Regional acceleration in ice mass loss from greenland and. Pdf on jan 1, 2012, andrew shepherd and others published a reconciled estimate of icesheet mass balance find, read and cite all the research you need. Geosciences free fulltext decorrelation of grace time. Proceedings of the national academy of sciences, 116 4, 10951103. University of leeds school of earth and environment. The purpose of this computation is to estimate the uncertainty of. Sensitivity of east antarctic outlet glaciers to future. Four decades of antarctic ice sheet mass balance from 19792017. Barletta, valentina r bentley, mike j bettadpur, srinivas. For the same period the antarctic ice sheet lost mass equivalent to 7. Increasing water vapor transport to the greenland ice. An ice sheet model validation framework for the greenland. To produce a reconciled icesheet mass balance estimate, we.
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