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Comparison Of Observations And Modelling Of Surface Mass Balance Variations In East Antarctica
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Book Synopsis Comparison of Observations and Modelling of Surface Mass Balance Variations in East Antarctica by : Bianca Kallenberg
Download or read book Comparison of Observations and Modelling of Surface Mass Balance Variations in East Antarctica written by Bianca Kallenberg and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mass balance changes of the Antarctic ice sheet are of significant interest due to its sensitivity to climatic changes and the contribution to changes in global sea level that is makes. In recent years, the Antarctic ice sheet has experienced increased temperatures inducing surface melting, accelerated ice flow and ice discharge but also an increase in accumulation. Geodetic observations suggest variable behaviour across the ice sheet, with an increase in mass over a vast area of East Antarctica and substantial thinning in West Antarctica. Despite considerable improvement on surface mass balance estimates using a variety of techniques, disparity remains mainly due to uncertainties of each method and the unknown contribution of glacial isostatic adjustment, the response of the lithosphere to prolonged surface loads. Estimates of bedrock uplift rates are limited and existing models are poorly constrained due to the lack of observations as a result of the extensive permanent ice coverage in Antarctica. This study investigates the possibility of combining and comparing altimetry and gravity observations by employing a regional climate model to simulate near surface climate and firn compaction, to separate the contributing ice sheet mass balance components of surface mass, firn compaction, ice dynamics and glacial isostatic adjustment within the observed signals. The region of interest covers an area including Enderby, Kemp and Mac.Robertson Land, in East Antarctica, an area where an increase in ice mass and ice height has been recorded over the past decade. Despite the general agreement that the positive signal is primarily related to increased snowfall, large uncertainties remain in bedrock uplift rates in this region due to the lack of observations. Estimates of ice dynamic rates are obtained by removing modelled surface elevation variations, due to surface mass and firn compaction, from altimetry observations, which are subsequently employed in models of mass variations to compare with gravimetric observations.
Book Synopsis Mass-balance Measurements and Modelling by :
Download or read book Mass-balance Measurements and Modelling written by and published by . This book was released on 2009 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mass Balance of the Cryosphere by : Jonathan L. Bamber
Download or read book Mass Balance of the Cryosphere written by Jonathan L. Bamber and published by Cambridge University Press. This book was released on 2018-03-01 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a comprehensive overview of the significance of the glaciers, ice caps and ice sheets of Antarctica and Greenland, this study reviews the theory behind climatological observations. It describes present modelling studies and predicted future changes in the mass balances of these key indicators of global climate change. The volume is an important reference for scientists working in climate change, environmental sciences and glaciology.
Book Synopsis Mass Balance of the Cryosphere by : Jonathan L. Bamber
Download or read book Mass Balance of the Cryosphere written by Jonathan L. Bamber and published by Cambridge University Press. This book was released on 2004-02-12 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed and comprehensive overview of observational and modelling techniques for all climate change, environmental science and glaciology researchers.
Book Synopsis Principles of Glacier Mechanics by : Roger LeB. Hooke
Download or read book Principles of Glacier Mechanics written by Roger LeB. Hooke and published by Cambridge University Press. This book was released on 2019-12-05 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principles of glacier physics are developed from basic laws in this up-to-date third edition for advanced students and researchers.
Book Synopsis Surface Mass Balance and Snow Surface Properties from the Lambert Glacier Basin Traverses 1990-94 by : Martin Higham
Download or read book Surface Mass Balance and Snow Surface Properties from the Lambert Glacier Basin Traverses 1990-94 written by Martin Higham and published by . This book was released on 1997 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ice Sheet Topography and Surface Characteristics in Eastern Wilkes Land, East Antarctica by : Ian D. Goodwin
Download or read book Ice Sheet Topography and Surface Characteristics in Eastern Wilkes Land, East Antarctica written by Ian D. Goodwin and published by . This book was released on 1988 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A modeling and observational study of East Antarctic surface mass balance by : W.M. CONNOLLEY
Download or read book A modeling and observational study of East Antarctic surface mass balance written by W.M. CONNOLLEY and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polar Environments and Global Change by : Roger G. Barry
Download or read book Polar Environments and Global Change written by Roger G. Barry and published by Cambridge University Press. This book was released on 2018-08-09 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveys atmospheric, oceanic and cryospheric processes, present and past conditions, and changes in polar environments.
Book Synopsis The Evolution of the Greenland Ice Sheet from the Last Glacial Maximum to Present-day: An Assessment Using Glaciological and Glacial Isostatic Adjustment Modelling by :
Download or read book The Evolution of the Greenland Ice Sheet from the Last Glacial Maximum to Present-day: An Assessment Using Glaciological and Glacial Isostatic Adjustment Modelling written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we constrain a three-dimensional thermomechanical model of Greenland ice sheet (GrIS) evolution from the Last Glacial Maximum (LGM, 21 ka BP) to the present-day using, primarily, observations of relative sea level (RSL) as well as field data on past ice extent. The new model (Huy2) fits a majority of the observations and is characterised by a number of key features: (i) the ice sheet had an excess volume (relative to present) of 4.1 m ice-equivalent sea level at the LGM, which increased to reach a maximum value of 4.6 m at 16.5 ka BP; (ii) retreat from the continental shelf was not continuous around the entire margin, as there was a Younger Dryas readvance in some areas. The final episode of marine retreat was rapid and relatively late (c. 12 ka BP), leaving the ice sheet land based by 10 ka BP; (iii) in response to the Holocene Thermal Maximum (HTM) the ice margin retreated behind its present-day position by up to 80 km in the southwest, 20 km in the south and 80 km in a small area of the northeast. As a result of this retreat the modelled ice sheet reaches a minimum extent between 5 and 4 ka BP, which corresponds to a deficit volume (relative to present) of 0.17 m ice-equivalent sea level. The results suggest that remaining discrepancies between the model and the observations are likely associated with non-Greenland ice load, differences between modelled and observed present-day ice elevation around the margin, lateral variations in Earth structure and/or the pattern of ice margin retreat. Predictions of present-day vertical land motion generated using the new Huy2 model are highly sensitive to variations of upper mantle viscosity. Depending on the Earth model adopted, different periods of post-LGM ice loading change dominate the present-day response in particular regions of Greenland. These results will be a useful resource when interpreting existing and future observations of vertical land motion in Greenland. In comparison to the sparse number of.
Book Synopsis Antarctic Climate Evolution by : Fabio Florindo
Download or read book Antarctic Climate Evolution written by Fabio Florindo and published by Elsevier. This book was released on 2008-10-10 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Antarctic Climate Evolution is the first book dedicated to furthering knowledge on the evolution of the world's largest ice sheet over its ~34 million year history. This volume provides the latest information on subjects ranging from terrestrial and marine geology to sedimentology and glacier geophysics. - An overview of Antarctic climate change, analyzing historical, present-day and future developments - Contributions from leading experts and scholars from around the world - Informs and updates climate change scientists and experts in related areas of study
Book Synopsis Glaciers and Climate Change by : J. Oerlemans
Download or read book Glaciers and Climate Change written by J. Oerlemans and published by CRC Press. This book was released on 2001-01-01 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text brings together meteorology and the theory of glacier flow, providing a fundamental understanding of how glaciers respond to climate change. Attention is paid to the microclimate of glaciers and the physical processes regulating the exchange of energy and mass between glacier surface and atmosphere. Simple analytical and numerical models are used to: · investigate glaciers sensitivity to climate change · estimate response times · make an interpretation of historical glacier records · assess the contribution of glacier melt to sea-level rise Modern developments in glacier research, including satellite measurements are discussed in detail, making this a valuable reference source.
Book Synopsis Mass Balance of Greenland and Antarctica Ice Sheets from Satellite Gravimetry by : Yu Zhang (Ph. D. in geodetic science)
Download or read book Mass Balance of Greenland and Antarctica Ice Sheets from Satellite Gravimetry written by Yu Zhang (Ph. D. in geodetic science) and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantitative assessment of the mass balance of polar ice sheets plays an important role in better understanding the response of ice sheets to anthropogenic climate change, the present-day and future global sea level change, and interactions between the ice sheets and the atmosphere, ocean and the solid Earth. In this study, I investigate the mass balance of Greenland and Antarctica ice sheets using Gravity Recovery And Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) twin-satellite missions gravity data from April 2002 to August 2020. Auxiliary gravity data from the Swarm mission 3-satellite constellation are also used to support the analysis bridging the GRACE/GRACE-FO data gap (July 2017 to May 2018). Ensemble models are composed combining the official GRACE temporal gravity solutions from CSR, GFZ, JPL and the in-house developed GRACE models using the improved energy balance approach (EBA). The improved atmospheric de-aliasing data produced using the ECMWF (European Centre for Medium-Range Weather Forecasts) Reanalysis 5th Generation (ERA5) data product, and 3-dimensional atmosphere mass computational algorithms are collectively used. The Swarm gravity models are also ensemble of four solutions produced from the kinematic orbit data using four different gravity recovery methods. Post-processing of the gravity models includes replacing low degree spherical harmonic terms (geocenter motions, J2 and J3), destriping filtering, Gaussian smoothing, glacial isostatic adjustment (GIA), forward modeling based signal leakage reduction and ellipsoidal correction. The satellite gravimetric data show that during the period of 2002/04-2020/08, Greenland and Antarctica ice sheets experience rapid mass losses at mean rates of -235.6±3.8 Gt/yr and -122.6±4.6 Gt/yr respectively, equivalent to 0.65 mm/yr and 0.34 mm/yr global sea level changes. In spatial domain, the southern part (including southeast and southwest regions) of Greenland contributes 52.3% of the total Greenland mass loss rate. The West Antarctica (WAIS) losses mass at mean rate of -149.3±3.4 Gt/yr, which accounts for 121.8% of the total Antarctica mass loss rate. The mass gain of +57.2±3.4 Gt/yr in East Antarctica (EAIS) compensates 46.7% of the mass imbalance. Greenland has record-breaking annual mass loss of -461.2±51.8 Gt in 2019. Similarly, Antarctica annual mass loss also sets record at -379.1±90.3 Gt in 2019, mostly due to the abnormal and unprecedented mass loss in EAIS which will be further investigated in the future incorporating independent surface mass balance (SMB) and ice discharge data. The noted abrupt and nonlinear changes in the mass balance of polar ice sheets are presumably due to an increasingly warmer Earth-induced climate episodes with varying time series, from a few years to much longer time periods, along to intraseasonal or shorter changes. It is concluded while the satellite gravimetry climate record is approaching a two decade data span, much longer data are needed to improve our understanding in the complex dynamics of these polar ice sheets responding to climate change.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309456002 Total Pages :83 pages Book Rating :4.3/5 (94 download)
Book Synopsis Antarctic Sea Ice Variability in the Southern Ocean-Climate System by : National Academies of Sciences, Engineering, and Medicine
Download or read book Antarctic Sea Ice Variability in the Southern Ocean-Climate System written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-04-24 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sea ice surrounding Antarctica has increased in extent and concentration from the late 1970s, when satellite-based measurements began, until 2015. Although this increasing trend is modest, it is surprising given the overall warming of the global climate and the region. Indeed, climate models, which incorporate our best understanding of the processes affecting the region, generally simulate a decrease in sea ice. Moreover, sea ice in the Arctic has exhibited pronounced declines over the same period, consistent with global climate model simulations. For these reasons, the behavior of Antarctic sea ice has presented a conundrum for global climate change science. The National Academies of Sciences, Engineering, and Medicine held a workshop in January 2016, to bring together scientists with different sets of expertise and perspectives to further explore potential mechanisms driving the evolution of recent Antarctic sea ice variability and to discuss ways to advance understanding of Antarctic sea ice and its relationship to the broader ocean-climate system. This publication summarizes the presentations and discussions from the workshop.
Book Synopsis The Geochemistry and Geophysics of the Antarctic Mantle by : A.P. Martin
Download or read book The Geochemistry and Geophysics of the Antarctic Mantle written by A.P. Martin and published by Geological Society of London. This book was released on 2023-02-14 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Memoir is the first dedicated to the Antarctic mantle. It is a cross-disciplinary reference work combining geochemistry and geophysics to characterize Antarctic mantle properties. Through observations and modelling the mantle structures, compositions and dynamics are characterized at regional and continental scales by subject experts. The Memoir reviews all known occurrences of sub-continental mantle xenoliths in igneous rocks. These studies are presented by region as southern or northern Victoria Land, Marie Byrd Land, the Antarctic Peninsula, East Antarctica and the sub-Antarctic Islands. Sub-oceanic mantle in tectonically emplaced and abyssal settings is also considered where known. This is complemented by a continental-scale mantle xenolith overview, mantle characteristics from igneous rocks and a quantitative mantle fabric study. State-of-the-art, continental-scale geophysical overviews of the Antarctic mantle are presented by discipline as seismology, gravity and magnetics, magnetotellurics, rheology, glacial isostatic adjustment, mantle convection and palaeotopography. This Memoir will be the reference for all researchers interested in the Antarctic mantle and its role in dynamics that shape the Antarctic surface and ice sheets.
Book Synopsis Encyclopedia of the Antarctic by : Beau Riffenburgh
Download or read book Encyclopedia of the Antarctic written by Beau Riffenburgh and published by Taylor & Francis. This book was released on 2007 with total page 1274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Publisher description
Author :Intergovernmental Panel on Climate Change (IPCC) Publisher :Cambridge University Press ISBN 13 :9781009157971 Total Pages :755 pages Book Rating :4.1/5 (579 download)
Book Synopsis The Ocean and Cryosphere in a Changing Climate by : Intergovernmental Panel on Climate Change (IPCC)
Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.
