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Reconstructing Surface Elevation Changes For The Greenland Ice Sheet 1993 2013 And Analysis Of Zachariae Isstrom Northeast Greenland
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Book Synopsis Reconstructing Surface Elevation Changes for the Greenland Ice Sheet (1993-2013) and Analysis of Zachariæ Isstrøm, Northeast Greenland by : Kyle Duncan
Download or read book Reconstructing Surface Elevation Changes for the Greenland Ice Sheet (1993-2013) and Analysis of Zachariæ Isstrøm, Northeast Greenland written by Kyle Duncan and published by . This book was released on 2015 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Previous studies investigating the velocity and elevation change records of the Greenland Ice Sheet (GrIS) revealed rapid and complex changes. It is therefore imperative to determine changes with both high spatial and temporal resolutions. By fusing multiple laser altimetry data sets, the Surface Elevation Reconstruction and Change (SERAC) program is capable of reconstructing surface elevation changes with high spatial and temporal resolution over the entire GrIS. The input data include observations from NASA's Ice, Cloud and land Elevation Satellite (ICESat) mission (2003-2009) as well as data collected by NASA's Airborne Topographic Mapper (ATM) (1993-2013) and Land, Vegetation and Ice Sensor (LVIS) (2007-2012) airborne laser altimetry systems. This study extends the record of surface elevation changes over the GrIS by adding 2012 and 2013 laser altimetry data to the previous 1993-2011 record. Extending the record leads to a new, more accurate and detailed altimetry record for 1993-2013. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Digital Elevation Models (DEMs) are fused with laser altimetry data over Zachariæ Isstrøm, northeast Greenland to analyze surface elevation changes and associated thinning rates during 1978-2014. Little to no elevation change occurred over Zachariæ Isstrøm from 1978-1999, however, from 1999-2014 elevation changes near the calving front became increasingly negative and accelerated. Calving front position showed steady retreat and grounding line position has been retreating towards the interior of the ice sheet at an increasing rate from 2010-2014 when compared to the 1996-2010 period. The measured elevation changes near the calving front have brought a large portion of the glacier close to the height of flotation. If the current thinning trend continues this portion of the glacier will reach flotation within the next 2-5 years allowing for further retreat and increased vulnerability to retreat for sections of the glacier further upstream.
Book Synopsis Glaciers and Ice Sheets in the Climate System by : Andrew Fowler
Download or read book Glaciers and Ice Sheets in the Climate System written by Andrew Fowler and published by Springer Nature. This book was released on 2020-10-28 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our realisation of how profoundly glaciers and ice sheets respond to climate change and impact sea level and the environment has propelled their study to the forefront of Earth system science. Aspects of this multidisciplinary endeavour now constitute major areas of research. This book is named after the international summer school held annually in the beautiful alpine village of Karthaus, Northern Italy, and consists of twenty chapters based on lectures from the school. They cover theory, methods, and observations, and introduce readers to essential glaciological topics such as ice-flow dynamics, polar meteorology, mass balance, ice-core analysis, paleoclimatology, remote sensing and geophysical methods, glacial isostatic adjustment, modern and past glacial fluctuations, and ice sheet reconstruction. The chapters were written by thirty-four contributing authors who are leading international authorities in their fields. The book can be used as a graduate-level textbook for a university course, and as a valuable reference guide for practising glaciologists and climate scientists.
Book Synopsis The State of the Greenland Ice Sheet by : Sebastian B. Simonsen
Download or read book The State of the Greenland Ice Sheet written by Sebastian B. Simonsen and published by . This book was released on 2012 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Greenland Ice Sheet Changes in Rates of Surface Elevation Change Between 1978 and 2015 by : Salvatore G. Candela
Download or read book Greenland Ice Sheet Changes in Rates of Surface Elevation Change Between 1978 and 2015 written by Salvatore G. Candela and published by . This book was released on 2019 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The margins of the greenland ice sheet are the leading contribution to global sea level rise, and changes have been noted at many of its marine terminating outlet glaciers. Here we present changes in the rates of surface elevation change along the entire margin of the Greenland ice sheet at 205 marine terminating glaciers between 1978 and 2015. We analyzed an assemblage of multiple surface elevation data sets to assess how rates of surface elevation change are changing at these glaciers. We find that the change in rates of surface elevation loss have increased by 150% to 300% since pre-2000 rates into the 2000’s, following by a 10% to 20% slowdown in current times. We find that these modern rates are significantly different from historic rates, suggesting that current forcings are changing the ice loss mechanics of the GrIS in the 21st century.
Book Synopsis Quantifying Changes in Climate and Surface Elevation of Polar Ice Sheets During the Last Glacial-interglacial Transition by : Jessica Anne Badgeley
Download or read book Quantifying Changes in Climate and Surface Elevation of Polar Ice Sheets During the Last Glacial-interglacial Transition written by Jessica Anne Badgeley and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes three research projects investigating changes in polar climate and the ice sheets during the last deglaciation. The first project, Chapter 2, reconstructs the past 20,000 years of Greenland temperature and precipitation to learn about their relationship and influences on the ice sheet. The reconstruction method, paleoclimate data assimilation, uses oxygen-isotope ratios of ice and accumulation rates from long ice-core records and extends this information to all locations across Greenland using spatial relationships derived from a transient climate-model simulation. Evaluations against out-of-sample proxy records indicate that the reconstructions capture the climate history at locations without ice-core records. The reconstructions show that the relationship between precipitation and temperature is frequency dependent and spatially variable, suggesting that thermodynamic scaling methods commonly used in ice-sheet modeling are overly simplistic. Overall, the results demonstrate that paleoclimate data assimilation is a useful tool for reconstructing the spatial and temporal patterns of past climate on timescales relevant to ice sheets. To learn how these climate reconstructions relate to the behavior of the ice sheet, we must also reconstruct the history of the ice sheet. Most observational data of the past ice sheet geometry, however, is at the margins of the ice sheet, while the ice core climate records are located in the interior. The second project, Chapter 3, investigates a common paleoaltimetry method that reconstructs elevation from temperature records. This method suggests the climate and elevation signals contained within an ice-core temperature record can be disentangled by comparing two proxy locations with similar climates. The difference between the records is assumed to be due to elevation, which is estimated by scaling the temperature difference by a lapse rate. I investigate the errors associated with this approach using the Antarctic ice sheet during the Last Glacial Maximum as a case study. Using an ensemble of climate simulations from global circulation models (GCMs), I extract modeled temperatures at locations of real ice cores. The errors are on the order of hundreds of meters and result from spatial heterogeneity in non-adiabatic temperature change, which itself stems in part from elevation-induced atmospheric circulation change. These findings suggest that caution is needed when interpreting temperature-based paleoaltimetry results for ice sheets. The third project, Chapter 4, seeks to learn about the elevation and climate signals contained within the WAIS Divide ice core temperature record by investigating whether they are consistent with accumulation rate reconstructions and annual layer thickness data at the ice core site. The difference in temperature change between West and East Antarctic ice core sites during the last deglacial period is about 6 °C. If this were due to differential elevation change at the sites, then the WAIS Divide ice core site would have been about 400 m higher during the Last Glacial Maximum. Using an ice-flow model, I determine that this elevation change is not consistent with published accumulation rate reconstructions and the annual layer thickness data from the WAIS Divide ice core site. Three factors may explain this inconsistency: the spatial heterogeneity in non-adiabatic temperature changes during the deglaciation, assumptions in the accumulation rate reconstructions, and assumptions in the ice-flow model. Future investigations into these factors may lead to a more consistent understanding of Antarctic climate and interior ice sheet changes during the last deglaciation.
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 Ice Sheets and Climate by : Johannes Oerlemans
Download or read book Ice Sheets and Climate written by Johannes Oerlemans and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate modelling is a field in rapid development, and the fltudy of cryospheric processes has become an important part of it. On smaller time scales, the effect of snow cover and sea ice on the atmospheric circulation is of concern for long-range weather forecasting. Thinking in decades or centuries, the effect of a C02 climatic warming on the present-day ice sheets, and the resulting changes in global sea level, has drawn a lot of attention. In particular, the dynamics of marine ice sheets (ice sheets on a bed that would be below sea level after removal of ice and full isostatic rebound) is a subject of continuous research. This interest stems from the fact that the West Antarctic Ice Sheet is a marine ice sheet which, according to some workers, may be close to a complete collapse. The Pleistocene ice ages, or glacial cycles, are best characterized by total ice volume on earth, indicating that on 4 5 large time scales (10 to 10 yr) ice sheets are a dominant component of the climate system. The enormous amount of paleoclimatic information obtained from deep-sea sediments in the last few decades has led to a complete revival of iriterest in the physical aspects of the Pleistocene climatic evolution.
Book Synopsis Seasonal and Interannual Changes in Surface Elevation of the Greenland Ice Sheet from Satellite Radar Altimetry by : Diana M. Segura
Download or read book Seasonal and Interannual Changes in Surface Elevation of the Greenland Ice Sheet from Satellite Radar Altimetry written by Diana M. Segura and published by . This book was released on 1998 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Outlet Glacier and Margin Elevation Changes by : W. Abdalati
Download or read book Outlet Glacier and Margin Elevation Changes written by W. Abdalati and published by BiblioGov. This book was released on 2013-08 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Repeat surveys by aircraft laser altimeter in 1993/4 and 1998/9 reveal significant thinning along 70% of the coastal parts of the Greenland ice sheet at elevations below about 2000 m. Thinning rates of more than 1 m/yr are common along many outlet glaciers, at all latitudes and, in some cases, at elevations up to 1500 m. Warmer summers along parts of the coast may have caused a few tens of cm/yr additional melting, but most of the observed thinning probably results from increased glacier velocities and associated creep rates. Three glaciers in the northeast all show patterns of thickness change indicative of surging behavior, and one has been independently documented as a surging glacier. There are a few areas of significant thickening (over 1 m/yr), and these are probably related to higher than normal accumulation rates during the observation period.
Book Synopsis Measuring Recent Ice Mass Loss from the Margin of the Greenland Ice Sheet Using Aster-derived Digital Elevation Models by : Tristan A. Rhodes
Download or read book Measuring Recent Ice Mass Loss from the Margin of the Greenland Ice Sheet Using Aster-derived Digital Elevation Models written by Tristan A. Rhodes and published by . This book was released on 2009 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Glaciers and Environmental Change by : Atle Nesje
Download or read book Glaciers and Environmental Change written by Atle Nesje and published by Routledge. This book was released on 2016-04-29 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This authoritative new text provides a thorough, updated account of glaciers and ice sheets as monitors and indicators of environmental change. It examines the record of environmental change within glaciers and ice sheets, and that of past environments left by retreating glaciers. These themes are examined within the context of environmental change in general and global climate change in particular. Methods of using palaeoenvironmental records are assessed and the implications for future environmental change are discussed. Evidence from glacier ice left in the landscape or within the geological record, provides one of the most important sources of information on environmental change. 'Glaciers and Environmental Change' is a comprehensive account of glaciers andice sheets as monitors and indictaors of environmental change. Based on the latest research, this book consolidates a diverse range of data and explains their applications. it also assesses methods of using palaeoenvironmental records. This authoritative new text examines not only the records of environmental change within glaciers but also that of past environments left by retreating glaciers. These themes are examined within the context of contemporary debates in environmental change and the volume also seeks to draw conclusions concernign past, present and future climatic change in relation to glaciers.
Book Synopsis Quantifying Forces Controlling the 2004-2005 Retreat, Mass Loss, and Speed-up of Kangerlussuaq Glacier, Greenland from Remotely Sensed Data by : David Patrick McCormick (II.)
Download or read book Quantifying Forces Controlling the 2004-2005 Retreat, Mass Loss, and Speed-up of Kangerlussuaq Glacier, Greenland from Remotely Sensed Data written by David Patrick McCormick (II.) and published by . This book was released on 2015 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kangerlussuaq Glacier, in SE Greenland, is the largest outlet glacier on the east coast of Greenland, draining approximately 3% of the Greenland Ice Sheet (GrIS). In 2004/05 this glacier underwent a dramatic retreat, as well as acceleration and mass loss, indicating a significant change in ice dynamics. During this time, the ice velocity increased from 6-8 km/yr to 14 km/yr, resulting in a peak mass loss of 40 Gt/yr by 2005, approximately 20% of the mass loss of the whole SE GrIS. Other SE Greenland outlet glaciers exhibited synchronous acceleration, retreat and thinning, and thus in 2004/05 the mass loss from SE Greenland dominated the overall mass balance of the GrIS. My study investigated the possible causes of increased outlet glacier mass loss in this sector by reconstructing the surface history and using the force budget technique to quantify the forces that control the flow of Kangerlussuaq Glacier before and after its major acceleration event. I used multiple sets of remotely sensed data, including repeat stereo imagery from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument on the Terra satellite and from the Satellite Pour l`Observation de la Terre (SPOT) satellite, as well as a bedrock DEM from radar observations provided by Center for Remote Sensing of Ice Sheets (CReSIS) to reconstruct the ice sheet surface topography and velocity in 2003 and 2006. These input data were then used to generate 2D force balance models. Previous studies have suggested that speed-up and thinning of Kangerlussuaq Glacier was caused by a collapse of the calving front in 2004/05 resulting in a loss of back-stress. However, my surface reconstruction revealed that thinning began in the summer of 2002; at least two years before the start of the rapid thinning and retreat of the calving front. This discovery was made possible by using the Surface Elevation Reconstruction And Change Detection (SERAC) method to combine the laser altimetry data and the stereo-image DEMs to improve the accuracy of the DEMs and to generate a high-resolution, accurate elevation change record. The force balance analysis showed only small changes in driving and resisting stresses between 2003 and 2006 despite the significant retreat. Therefore, I reject the hypothesis that the speed-up was the result of a collapsed calving front. My results suggest the speed-up was in part due to a change in the subglacial hydrology that caused a change in effective basal pressure. The 2003-2004 period showed below-average meltwater runoff that may have reduced water entering the subglacial drainage system. If subglacial drainage is through a network of tunnels, a reduction in the subglacial water flux would lower the effective basal pressure. Because the sliding velocity is inversely proportional to the effective pressure, this would increase the sliding speed. The increase in surface melt and runoff starting in 2005 would have increased the subglacial water flux again, and the resulting increase in effective pressure would have caused the glacier to slow down.
Book Synopsis Reconstructing Ice Sheet and Alpine Glacier Margins During the Early Holocene on Nuussuaq in Central West Greenland by : Sandra L. Cronauer
Download or read book Reconstructing Ice Sheet and Alpine Glacier Margins During the Early Holocene on Nuussuaq in Central West Greenland written by Sandra L. Cronauer and published by . This book was released on 2014 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparison of past ice sheet margin and alpine glacier reconstructions to paleoclimate records can offer insight into the dominant forcing mechanisms that determine glacial response to changes in climate. Previous research on a major ice stream in central West Greenland reveals that the Greenland Ice Sheet (GrIS) responded to abrupt centennial-scale cold periods at ~9. 3 and ~8. 2 ka. The aim of this thesis is to determine whether or not alpine glaciers and a land-terminating ice sheet margin on the peninsula of Nuussuaq in central West Greenland also responded to abrupt climate changes in the early Holocene. To this end, I reconstructed ice sheet and alpine glacier histories on Nuussuaq using cosmogenic 10Be surface exposure dating (herein 10Be dating) and lake sediment analysis. Neither the ice margin nor alpine glacier chronologies indicate a response to abrupt climate change at 9. 3 ka or 8. 2 ka. I found that the Drygalski Moraines are early Holocene in age, with mean moraine ages of 8. 6 ℗ł 0. 4 ka (n=2), 8. 5 ℗ł 0. 2 ka (n=3), and 7. 6 ℗ł 0. 1 ka (n=2) from outer to inner. The moraine chronology, combined with radiocarbon dated lake sediment stratigraphy from an adjacent proglacial lake, reveal that the ice margin remained within about one kilometer of its present position from ~9. 9 to 5. 4 ka. This evidence for ice sheet stability during the first half of the Holocene, followed by minimum ice extent between ~5. 4 and 0. 6 ka, contrasts with many records of early Holocene warmth during the Holocene maximum of Northern Hemisphere summer insolation. This period of ice margin stability may relate to adjacent ocean temperatures, which did not increase until the middle Holocene. A 10Be chronology of moraines deposited by a nearby alpine glacier reveals glacier stability at 10. 5 ℗ł 0. 3 ka, during the Preboreal period. Moraine deposition at this time is potentially due to increased moisture availability as the GrIS retreated and sea ice declined. The alpine glacier chronology also fits well within an emerging pattern of alpine glacier advance during the Preboreal period on East and West Greenland. The results presented in this thesis suggest that GrIS and alpine glacier margin response to changes in climate is complex, and that detailed chronologies from moraines on Greenland can shed light on the intricate processes that link glaciers and climate.
Download or read book Vanishing Ice written by Vivien Gornitz and published by Columbia University Press. This book was released on 2019-06-11 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Arctic is thawing. In summer, cruise ships sail through the once ice-clogged Northwest Passage, lakes form on top of the Greenland Ice Sheet, and polar bears swim farther and farther in search of waning ice floes. At the opposite end of the world, floating Antarctic ice shelves are shrinking. Mountain glaciers are in retreat worldwide, unleashing flash floods and avalanches. We are on thin ice—and with melting permafrost’s potential to let loose still more greenhouse gases, these changes may be just the beginning. Vanishing Ice is a powerful depiction of the dramatic transformation of the cryosphere—the world of ice and snow—and its consequences for the human world. Delving into the major components of the cryosphere, including ice sheets, valley glaciers, permafrost, and floating ice, Vivien Gornitz gives an up-to-date explanation of key current trends in the decline of ice mass. Drawing on a long-term perspective gained by examining changes in the cryosphere and corresponding variations in sea level over millions of years, she demonstrates the link between thawing ice and sea-level rise to point to the social and economic challenges on the horizon. Gornitz highlights the widespread repercussions of ice loss, which will affect countless people far removed from frozen regions, to explain why the big meltdown matters to us all. Written for all readers and students interested in the science of our changing climate, Vanishing Ice is an accessible and lucid warning of the coming thaw.
Book Synopsis Temporal History of Ice Dynamics Contribution to Volume Changes of the Southeast Greenland Ice Sheet by : Soroush Rezvanbehbahani
Download or read book Temporal History of Ice Dynamics Contribution to Volume Changes of the Southeast Greenland Ice Sheet written by Soroush Rezvanbehbahani and published by . This book was released on 2013 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current estimations of the contribution of ice sheets to future sea level rise are solely based on changes in Surface Mass Balance (SMB) of Antarctic and Greenland Ice Sheets. However, the reported SMB changes over the Greenland Ice Sheet explain only about 50% of the observed total mass loss of the Greenland Ice Sheet (GrIS). The other 50% is caused by ice dynamic processes, which have not been included in most sea level rise predictions. The goal of this study was to investigate surface elevation changes of the entire GrIS in 2003-2009. In addition to the total elevation changes, elevation changes due to ice dynamics were also estimated by computing the difference between surface elevation changes measured by laser altimetry and those caused by SMB processes. I applied the Surface Elevation And Change Detection (SERAC) approach to derive surface elevation changes from laser altimetry observations. By fusing satellite laser altimetry (Ice, Cloud, and land Elevation Satellite (ICESat)) and airborne laser altimetry (Airborne Topographic Mapper (ATM) and Land, Vegetation, and Ice Sensor (LVIS)) data, I have reconstructed the elevation and volume change history of the GrIS at more than 55,000 locations. To estimate elevation changes due to SMB, SMB anomalies from RACMO2/GR were converted into height changes using a simple firn-densification model. To facilitate the visualization of elevation changes and the computation of volume changes I interpolated the irregularly distributed observations of ice sheet elevation changes into regular grids. Finally, I partitioned the ice sheet elevation and volume changes into SMB-related and ice dynamics-related changes and computed the contributions of major drainage basins. I have shown that the southeast GrIS was the main contributor of ice loss in Greenland inx2003-2009. The Kangerlussuaq Glacier drainage basin exhibited the largest ice-dynamics related volume loss from the twelve major drainage basins of southeast Greenland. The regions below 2000 m elevation, despite constituting only about 28% of the southeast GrIS, contribute to more than 92% to its ice-dynamics related volume loss. Ice sheet elevation changes, as well as annual volume changes of the twelve major southeast Greenland drainage basins, show a complex spatial and temporal pattern. Finally, the effect of ocean and air temperature changes as external forcing mechanisms on the observed volume change patterns is also discussed. I have shown that the trend of ocean temperatures anomalies along the southeast coast of the GrIS shows a close similarity to the estimated ice-dynamics related volume change pattern.
Book Synopsis Reconstructing Holocene Glacier Changes in West Greenland from Multispectral Imagery by : Kyung In Huh
Download or read book Reconstructing Holocene Glacier Changes in West Greenland from Multispectral Imagery written by Kyung In Huh and published by . This book was released on 2007 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The Greenland Ice Sheet (GIS), the second largest ice mass on Earth, is generally believed to be vulnerable to changes in climate due to its location at more temperate latitudes. Its mass balance and equilibrium state are complex functions of external climate forcing and internal dynamical processes. To understand the mass balance of the Greenland Ice Sheet it is crucial to construct longer temporal records, reaching back to the Little Ice Age (LIA) or beyond. Jakobshavn Isbr in central west Greenland is one of the most dynamically thinning outlet glaciers draining the interior of the Greenland Ice Sheet, contributing 0.06 mm/yr to global sea level rise (Joughin and others, 2004). In this study, multispectral ASTER (Advanced Spaceborne Thermal Emission and Reflection Radiometer) imagery was used to develop procedures for mapping glacial trimlines and terminal moraines around Jakobshavn Isbne. The motivation for using satellite imagery for mapping glacial-geological features is the greater spatial coverage that can be achieved, as opposed to the traditional method of field mapping in restricted areas. ASTER imagery provides spectral bands spanning from the visible to the thermal infrared bands, including two stereo bands, enabling us to map the spectral properties of the Earth's surface as well as to obtain surface topography. With these great opportunities from ASTER, glacial trimlines and major moraine systems around the study area were efficiently mapped and results were verified by other data such as stereo pairs of aerial photographs and GPS data. Extracted trimzone from ASTER classification image and ASTER DEM were applied to calculate ice volume shrinkage since LIA and this is related to Greenland Ice Sheet volume changes and the potential for future changes.
Book Synopsis Stratigraphic Analysis of a Deep Ice Core from Greenland by : Chester C. Langway
Download or read book Stratigraphic Analysis of a Deep Ice Core from Greenland written by Chester C. Langway and published by Geological Society of America. This book was released on 1970 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:
