PROGRAM IGS SYMPOSIUM, FAIRBANKS, 25-‐29 June, 2012

Total Page:16

File Type:pdf, Size:1020Kb

PROGRAM IGS SYMPOSIUM, FAIRBANKS, 25-‐29 June, 2012 PROGRAM IGS SYMPOSIUM, FAIRBANKS, 25-29 June, 2012 Version 15 June 2012 Time Presenter Monday morning Observations I (Chair: Garry Clarke) 9:00 Welcome MacAyeal/Hock 9:15 63A521 Our Communal Response to Warming: Are We on tHe RigHt Track? (INVITED) Robert Bindschadler 9:45 63A328 Time-varying mass changes of the Greenland and Antarctic ice sheets from radar and laser altimetry Ruud Hurkmans 10:00 63A397 High space and time resolution radar altimetry: a powerful tool for ice sheet volume change study. Thomas Flament 10:15 63A459 Greenland outlet glacier velocities during 2000-2010 Twila Moon 10:30 - 11:00 COFFEE BREAK Observations I (Chair: Will Harrison) 11:00 63A321 Two decades of dynamic stability before retreat for Kangerdlugssuaq, Helheim and other Greenland glaciers Suzanne Bevan 11:15 63A274 Outlet glacier response to meteorological and oceanic forcing, Jakobshavn Isbræ, Greenland David Podrasky 11:30 63A375 Stability Assessment of Antarctic Ice Shelves with respect to Melt-induced Disintegration Ted Scambos 11:45 63A403 Localised basal melt inferred from the radar-derived internal structure of Pine Island Glacier, West Antarctica Edward King 12:00 63A462 Regional Measurements of Snow Accumulation on Ice Sheets from Ultra-Wideband Airborne Radars David Braaten Wind induced accumulation hiatus over East Antarctica: Implications for continent-wide surface mass 12:15 63A374 Indrani Das balance 12:30 - 14:00 LUNCH Monday afternoon Ice dynamics (Chair: Andrew Macintosh) 14:00 63A501 Inland acceleration of the Greenland Ice Sheet Martin Truffer 14:15 63A489 Accelerated Dynamic Changes of the North and Northwestern Greenland Ice Sheet Greg Babonis 14:30 63A409 Ice dynamic response to slow and fast supraglacial lake drainage in Greenland Marco Tedesco 14:45 63A189 A geophysical characterization of Whillans Ice Stream Robert Jacobel 15:00 63A442 Short-time-scale variations in outlet glacier velocity and strain fields due to terminus ice loss Meredith Nettles Widespread decadal-scale decrease of land-terminating glacier speed revealed using repeat optical satellite 15:15 63A310 Torborg Heid images 15:30 - 16:00 COFFEE BREAK Observations II and Impacts of Glacier Change (Chair: Francesca Pelliciotti) Ice-volume changes, bias-correction of mass-balance measurements and changes in sub-glacial water bodies 16:00 63A422 Tómas Jóhannesson derived by LiDAR-mapping of the surface of Icelandic ice caps 16:25 63A289 Areal changes of Southern Patagonia Icefield and nearby climate over the past 67 years Pedro Skvarca 16:30 63A302 A century of ice retreat on Kilimanjaro: The mapping reloaded Nicolas Cullen Coupling Field and Remotely-Sensed Data for Validation of a Distributed Hydrological and Glacier Model: 16:45 63A393 Patrick Burns Implications for Water Resources in the Cordillera Blanca, Peru Modeling the glacio-hydrological response of a Himalayan watershed to climate change, using a physically- 17:00 63A246 Silvan Ragettli oriented fully distributed model: sources of model uncertainty 17:15 63A509 Biogeochemistry of glacial runoff along the Gulf of Alaska Eran Hood 17:45 Planning Your Future in Polar & Cryospheric Research - an APECS Career Development Discussion Panel Tuesday morning Glacier mass balance - climate interaction (Chair: Bob Bindschaedler) 9:00 63A286 Glacier mass balance goes global (INVITED) Roger Braithwaite 9:30 63A470 Estimates of global-average glacier mass balance J. Graham Cogley 9:45 63A359 GRACE mass balance estimates for all the Earth's ice-covered regions John Wahr An investigation of the spatial distribution of mass balance signals extracted from high-resolution GRACE 10:00 63A381 Anthony Arendt mascon simulations 10:15 63A344 Correction factors for extrapolating measured mass balances to all glaciers in Alaska Raymond Le Bris 10:30 - 11:00 COFFEE BREAK Glacier mass balance - climate interaction (Chair: Jon-Ove Hagen) Suitability of a constant air temperature lapse rate over an Alpine glacier - Testing the Greuell and Böhm 11:00 63A477 Lene Petersen model as an alternative 11:15 63A369 Evaluating the performance of an energy balance and snow redistribution model Alice Doughty 11:30 63A280 The role of subsurface heat exchange: energy partitioning at Austfonna ice cap, Svalbard, over 2004-2008 Torbjoern I. Oestby Mapping supraglacial debris thickness on mountain glaciers using satellite data: Validation of a new, 11:45 63A465 Francesca Pelliciotti physically-based method Decelerated mass loss of Hurd and Johnsons glaciers, Livingston Island, Antarctic Peninsula, in spite of 12:00 63A268 Francisco J. Navarro continued regional warming Near surface water layer within the Greenland Ice Sheet found during winter conditions from firn cores, 12:15 63A361 Richard Forster ground based radar, and NASA airborne radar 12:30 - 14:00 LUNCH Tuesday afternoon Subglacial processes I (Chair: Andres Rivera) 14:00 63A306 Short term dynamics of the Greenland Ice Sheet observed with sensors in deep boreholes Martin Lüthi 14:15 63A331 Modelling the coupling of flood discharge and glacier flow during jökulhlaups Jonathan Kingslake Surge initiation or meltwater induced acceleration? Observations of a marine-terminating outlet glacier of 14:30 63A279 Thorben Dunse Austfonna, Svalbard. 14:45 63A428 The effects of jökulhlaups on glacier motion. Several case studies from Vatnajökull ice cap. Eyjólfur Magnússon 15:00 POSTER SESSION I (including coffee/beer) 17:30 SELIGMAN CRYSTAL AWARD CEREMONY FOR DR. ALMUT IKEN 19:00 Barbeque in front of Museum of the North (incl. entrance to the Museum) Wednesday morning Glacer mass balance - past and future (Chair: Jo Jacka) 9:00 63A412 Glacier Changes in nortHern Canada since tHe 1957-58 IGY (INVITED) Martin Sharp 9:30 63A282 On the effect of climate variability on mountain glaciers Daniel Farinotti 9:45 63A272 What caused the late 20th century advance of New Zealand glaciers? Andrew Mackintosh 10:00 63A008 Glacier Mass balance variations in Tien shan, Cetral Asia, during the 2nd half of the 20th century Shiyin Liu 10:15 63A270 Glacier geometries and their usability for climate reconstruction Alexander Jarosch 10:30 - 11:00 COFFEE BREAK Ice volume and thickness distribution of all mountain glaciers around the globe - a new phsically-based 11:00 63A420 Matthias Huss estimation method 11:15 63A267 On the accuracy of direct and indirect mass balance measurements Andrea Fischer 11:30 63A269 A global estimate of the mass balance of mountain glaciers from 1900 - 2300 Ben Marzeion 11:45 63A327 21st century volume projections for 80 glaciers in different climatic regions Rianne Giesen Regional and global projections of glacier melt in response to climate scenarios from GCMs prepared for 12:00 63A367 Valentina Radic IPCC AR5 12:15 63A334 The 21st century deglaciation of western Canada Garry Clarke Wednesday afternoon 12:45 Excursion (including bag lunches; dinner at last excursion site; return to Fairbanks around 9 pm) Thursday morning Glacier-ocean interactions I (Chair: Martin Lüthi) 9:00 63A520 Columbia Glacier in 2012: Present and Future (INVITED) W. Tad Pfeffer 9:30 63A479 Does calving matter? Evidence for significant submarine melt at the terminus of Yahtse Glacier. Timothy Bartholomaus 9:45 63A447 Observations of a Greenland Tidewater Outlet Glacier Behavior Using a Ground Based RADAR Interferometer Ryan Cassotto 10:00 63A433 Controls on calving at Kangerdlugssuaq and Helheim Glaciers, East Greenland Adrian Luckman 10:15 63A410 Dynamic and thermodynamic regimes of ice shelves in cold and warm ocean environments Olga Sergienko 10:30 - 11:00 COFFEE BREAK 11:00 63A499 Meltwater plumes on tidewater glaciers: constraining models with observations Martin O'Leary 11:15 63A503 Antarctic instability and possible associated contribution to sea-level rise Gael Durand 11:30 ANNUAL GENERAL MEETING 12:30 - 14:00 LUNCH Thursday afternoon Ice sheet modeling I (Chair: Gudfinna Adalgeirsdottir) 14:00 63A301 Development and Applications of the Community Ice Sheet Model Stephen Price 14:15 63A085 Resolution of ice streams and outlet glaciers in large-scale simulations of the Greenland ice sheet Ralf Greve 14:30 63A444 Better subglacial hydrology into PISM Ed Bueler 14:45 63A423 Elmer/Ice: a new-generation ice-sheet model to infer ice-sheet contribution to sea level rise Lionel Favier Advanced ice sheet modeling: Scalable parallel adaptive full Stokes solver, inversion for basal sliding and 15:00 63A515 Tobin Isaac rheological parameters, and uncertainty quantification 15:15 63A498 A parallel unstructured implicit 3D polythermal model for outlet glaciers Jed Brown 15:30 POSTER SESSION II (including coffee/beer) 18:30 BANQUET ON RIVER CRUISE Friday morning Subglacial processes II (Chair: Gwenn Flowers) 9:00 63A450 Hydraulic controls on glacier and ice sheet flow (INVITED) Christian Schoof 9:30 63A481 Gearshifts in subglacial hydrology: Planform development of distributed, sheet-like water systems Timothy Creyts 9:45 63A259 Basal melting of temperate tidewater glaciers: fiction of friction? David Alexander Grounding Zone Structure and Bathymetry from Active Source Seismic Surveying, Whillans Ice Stream, West 10:00 63A299 Huw Horgan Antarctica 10:15 Video poster prize presentation 10:30 - 11:00 COFFEE BREAK Glacier-ocean interactions II (Chair: Bob Jacobel) 11:00 63A288 Jamming of Ice Melange: Using Particle Rafts to Model Ice Melange Dynamics Chin-Chang Kuo 11:15 63A303 A new perspective on glacial earthquake source mechanics Jason Amundson 11:30 63A391 Estimates of marine tidewater terminus melting in Svalbard Ross Powell
Recommended publications
  • Basal Control of Supraglacial Meltwater Catchments on the Greenland Ice Sheet
    The Cryosphere, 12, 3383–3407, 2018 https://doi.org/10.5194/tc-12-3383-2018 © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. Basal control of supraglacial meltwater catchments on the Greenland Ice Sheet Josh Crozier1, Leif Karlstrom1, and Kang Yang2,3 1University of Oregon Department of Earth Sciences, Eugene, Oregon, USA 2School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China 3Joint Center for Global Change Studies, Beijing 100875, China Correspondence: Josh Crozier ([email protected]) Received: 5 April 2018 – Discussion started: 17 May 2018 Revised: 13 October 2018 – Accepted: 15 October 2018 – Published: 29 October 2018 Abstract. Ice surface topography controls the routing of sur- sliding regimes. Predicted changes to subglacial hydraulic face meltwater generated in the ablation zones of glaciers and flow pathways directly caused by changing ice surface to- ice sheets. Meltwater routing is a direct source of ice mass pography are subtle, but temporal changes in basal sliding or loss as well as a primary influence on subglacial hydrology ice thickness have potentially significant influences on IDC and basal sliding of the ice sheet. Although the processes spatial distribution. We suggest that changes to IDC size and that determine ice sheet topography at the largest scales are number density could affect subglacial hydrology primarily known, controls on the topographic features that influence by dispersing the englacial–subglacial input of surface melt- meltwater routing at supraglacial internally drained catch- water. ment (IDC) scales ( < 10s of km) are less well constrained. Here we examine the effects of two processes on ice sheet surface topography: transfer of bed topography to the surface of flowing ice and thermal–fluvial erosion by supraglacial 1 Introduction meltwater streams.
    [Show full text]
  • Calving Processes and the Dynamics of Calving Glaciers ⁎ Douglas I
    Earth-Science Reviews 82 (2007) 143–179 www.elsevier.com/locate/earscirev Calving processes and the dynamics of calving glaciers ⁎ Douglas I. Benn a,b, , Charles R. Warren a, Ruth H. Mottram a a School of Geography and Geosciences, University of St Andrews, KY16 9AL, UK b The University Centre in Svalbard, PO Box 156, N-9171 Longyearbyen, Norway Received 26 October 2006; accepted 13 February 2007 Available online 27 February 2007 Abstract Calving of icebergs is an important component of mass loss from the polar ice sheets and glaciers in many parts of the world. Calving rates can increase dramatically in response to increases in velocity and/or retreat of the glacier margin, with important implications for sea level change. Despite their importance, calving and related dynamic processes are poorly represented in the current generation of ice sheet models. This is largely because understanding the ‘calving problem’ involves several other long-standing problems in glaciology, combined with the difficulties and dangers of field data collection. In this paper, we systematically review different aspects of the calving problem, and outline a new framework for representing calving processes in ice sheet models. We define a hierarchy of calving processes, to distinguish those that exert a fundamental control on the position of the ice margin from more localised processes responsible for individual calving events. The first-order control on calving is the strain rate arising from spatial variations in velocity (particularly sliding speed), which determines the location and depth of surface crevasses. Superimposed on this first-order process are second-order processes that can further erode the ice margin.
    [Show full text]
  • Seismic Model Report.Pdf
    Scientific Report GEFSC Loan 925 The Character and Extent of subglacial Deformation and its Links to Glacier Dynamics in the Tarfala Basin, northern Sweden Jeffrey Evans, David Graham, and Joseph Pomeroy Polar and Alpine Research Group, Loughborough University ABSTRACT A pilot passive seismology experiment was conducted across the main overdeepening of Storglaciaren in the Tarfala Basin, northern Sweden, in July 2010, to see whether basal microseismic waveforms could be detected beneath a small polythermal arctic glacier and to investigate the spatial and temporal distribution of such waveforms in relation to known glacier flow dynamics. The high ablation rate made it difficult to keep geophones buried and well- coupled to the glacier during the experiment and reduced the number of days of good quality data collection. Event counts and the subsequent characterisation of typical and atypical waveforms showed that the dominant waveforms detected were from near-surface events such as crevassing. Although basal sliding is known to occur in the overdeepening, no convincing examples of basal waveforms were detected, which suggests basal microseismic signals are rare or difficult to detect beneath polythermal glaciers like Storglaciaren, a finding that is consistent with results from alpine glaciers in Switzerland. The data- set could prove useful to glaciologists interested in the dynamics of near-surface events such as crevassing, the opening and closing of englacial water conduits, or temporal and spatial changes in the glacier’s stress field. Background Smith (2006) found that pervasive soft-bed deformation characterised parts of the Rutland Ice Stream in West Antarctica and produced 6 times fewer basal microseismic signals than regions where basal sliding or stick slip movement dominated.
    [Show full text]
  • The Triggers of the Disaggregation of Voyeykov Ice Shelf (2007), Wilkes Land, East Antarctica, and Its Subsequent Evolution
    Journal of Glaciology The triggers of the disaggregation of Voyeykov Ice Shelf (2007), Wilkes Land, East Antarctica, and its subsequent evolution Article Jennifer F. Arthur1 , Chris R. Stokes1, Stewart S. R. Jamieson1, 1 2 3 Cite this article: Arthur JF, Stokes CR, Bertie W. J. Miles , J. Rachel Carr and Amber A. Leeson Jamieson SSR, Miles BWJ, Carr JR, Leeson AA (2021). The triggers of the disaggregation of 1Department of Geography, Durham University, Durham, DH1 3LE, UK; 2School of Geography, Politics and Voyeykov Ice Shelf (2007), Wilkes Land, East Sociology, Newcastle University, Newcastle-upon-Tyne, NE1 7RU, UK and 3Lancaster Environment Centre/Data Antarctica, and its subsequent evolution. Science Institute, Lancaster University, Bailrigg, Lancaster, LA1 4YW, UK Journal of Glaciology 1–19. https://doi.org/ 10.1017/jog.2021.45 Abstract Received: 15 September 2020 The weakening and/or removal of floating ice shelves in Antarctica can induce inland ice flow Revised: 31 March 2021 Accepted: 1 April 2021 acceleration. Numerical modelling suggests these processes will play an important role in Antarctica’s future sea-level contribution, but our understanding of the mechanisms that lead Keywords: to ice tongue/shelf collapse is incomplete and largely based on observations from the Ice/atmosphere interactions; ice/ocean Antarctic Peninsula and West Antarctica. Here, we use remote sensing of structural glaciology interactions; ice-shelf break-up; melt-surface; sea-ice/ice-shelf interactions and ice velocity from 2001 to 2020 and analyse potential ocean-climate forcings to identify mechanisms that triggered the rapid disintegration of ∼2445 km2 of ice mélange and part of Author for correspondence: the Voyeykov Ice Shelf in Wilkes Land, East Antarctica between 27 March and 28 May 2007.
    [Show full text]
  • COLD-BASED GLACIERS in the WESTERN DRY VALLEYS of ANTARCTICA: TERRESTRIAL LANDFORMS and MARTIAN ANALOGS: David R
    Lunar and Planetary Science XXXIV (2003) 1245.pdf COLD-BASED GLACIERS IN THE WESTERN DRY VALLEYS OF ANTARCTICA: TERRESTRIAL LANDFORMS AND MARTIAN ANALOGS: David R. Marchant1 and James W. Head2, 1Department of Earth Sciences, Boston University, Boston, MA 02215 [email protected], 2Department of Geological Sciences, Brown University, Providence, RI 02912 Introduction: Basal-ice and surface-ice temperatures are contacts and undisturbed underlying strata are hallmarks of cold- key parameters governing the style of glacial erosion and based glacier deposits [11]. deposition. Temperate glaciers contain basal ice at the pressure- Drop moraines: The term drop moraine is used here to melting point (wet-based) and commonly exhibit extensive areas describe debris ridges that form as supra- and englacial particles of surface melting. Such conditions foster basal plucking and are dropped passively at margins of cold-based glaciers (Fig. 1a abrasion, as well as deposition of thick matrix-supported drift and 1b). Commonly clast supported, the debris is angular and sheets, moraines, and glacio-fluvial outwash. Polar glaciers devoid of fine-grained sediment associated with glacial abrasion include those in which the basal ice remains below the pressure- [10, 12]. In the Dry Valleys, such moraines may be cored by melting point (cold-based) and, in extreme cases like those in glacier ice, owing to the insulating effect of the debris on the the western Dry Valleys region of Antarctica, lack surface underlying glacier. Where cored by ice, moraine crests can melting zones. These conditions inhibit significant glacial exceed the angle of repose. In plan view, drop moraines closely erosion and deposition.
    [Show full text]
  • Inferred Basal Friction and Surface Mass Balance of the Northeast
    The Cryosphere, 8, 2335–2351, 2014 www.the-cryosphere.net/8/2335/2014/ doi:10.5194/tc-8-2335-2014 © Author(s) 2014. CC Attribution 3.0 License. Inferred basal friction and surface mass balance of the Northeast Greenland Ice Stream using data assimilation of ICESat (Ice Cloud and land Elevation Satellite) surface altimetry and ISSM (Ice Sheet System Model) E. Larour1, J. Utke3, B. Csatho4, A. Schenk4, H. Seroussi1, M. Morlighem2, E. Rignot1,2, N. Schlegel1, and A. Khazendar1 1Jet Propulsion Laboratory – California Institute of Technology, 4800 Oak Grove Drive MS 300-323, Pasadena, CA 91109-8099, USA 2University of California Irvine, Department of Earth System Science, Croul Hall, Irvine, CA 92697-3100, USA 3Argonne National Lab, Argonne, IL 60439, USA 4Department of Geological Sciences, University at Buffalo, Buffalo, NY, USA Correspondence to: E. Larour ([email protected]) Received: 5 April 2014 – Published in The Cryosphere Discuss.: 8 May 2014 Revised: 9 September 2014 – Accepted: 30 September 2014 – Published: 15 December 2014 Abstract. We present a new data assimilation method within 1 Introduction the Ice Sheet System Model (ISSM) framework that is capa- ble of assimilating surface altimetry data from missions such Global mean sea level (GMSL) rise observations show an as ICESat (Ice Cloud and land Elevation Satellite) into re- overall budget in which freshwater contribution from the po- constructions of transient ice flow. The new method relies on lar ice sheets represents a significant portion (Church and algorithmic differentiation to compute gradients of objective White, 2006, 2011; Stocker et al., 2013), which is actually functions with respect to model forcings.
    [Show full text]
  • Tidal Modulation of Antarctic Ice Shelf Melting Ole Richter1,2, David E
    Tidal Modulation of Antarctic Ice Shelf Melting Ole Richter1,2, David E. Gwyther1, Matt A. King2, and Benjamin K. Galton-Fenzi3 1Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 129, Hobart, TAS, 7001, Australia. 2Geography & Spatial Sciences, School of Technology, Environments and Design, University of Tasmania, Hobart, TAS, 7001, Australia. 3Australian Antarctic Division, Kingston, TAS, 7050, Australia. Correspondence: Ole Richter ([email protected]) This is a non-peer reviewed preprint submitted to EarthArXiv. This preprint has also been submitted to The Cryosphere for peer review. 1 Abstract. Tides influence basal melting of individual Antarctic ice shelves, but their net impact on Antarctic-wide ice-ocean interaction has yet to be constrained. Here we quantify the impact of tides on ice shelf melting and the continental shelf seas 5 by means of a 4 km resolution circum-Antarctic ocean model. Activating tides in the model increases the total basal mass loss by 57 Gt/yr (4 %), while decreasing continental shelf temperatures by 0.04 ◦C, indicating a slightly more efficient conversion of ocean heat into ice shelf melting. Regional variations can be larger, with melt rate modulations exceeding 500 % and temperatures changing by more than 0.5 ◦C, highlighting the importance of capturing tides for robust modelling of glacier systems and coastal oceans. Tide-induced changes around the Antarctic Peninsula have a dipolar distribution with decreased 10 ocean temperatures and reduced melting towards the Bellingshausen Sea and warming along the continental shelf break on the Weddell Sea side. This warming extends under the Ronne Ice Shelf, which also features one of the highest increases in area-averaged basal melting (150 %) when tides are included.
    [Show full text]
  • Ice News Bulletin of the International
    ISSN 0019–1043 Ice News Bulletin of the International Glaciological Society Number 154 3rd Issue 2010 Contents 2 From the Editor 25 Staff changes 3 Recent work 25 New Chair for the Awards Committee 3 Australia 26 Report from the IGS conference on Snow, 3 Ice cores Ice and Humanity in a Changing Climate, 4 Ice sheets, glaciers and icebergs Sapporo, Japan, 21–25 June 2010 5 Sea ice and glacimarine processes 31 Report from the British Branch Meeting, 6 Large-scale processes Aberystwyth 7 Remote sensing 32 Meetings of other societies 8 Numerical modelling 32 Workshop of Glacial Erosion 9 Ecology within glacial systems Modelling 10 Geosciences and glacial geology 33 Northwest Glaciologists’ Meeting 11 International Glaciological Society 35 UKPN Circumpolar Remote Sensing 11 Journal of Glaciology Workshop 14 Annals of Glaciology 51(56) 35 Notes from the production team 15 Annals of Glaciology 52(57) 36 San Diego symposium, 2nd circular 16 Annals of Glaciology 52(58) 44 News 18 Annals of Glaciology 52(59) 44 Obituary: Keith Echelmeyer 19 Annual General Meeting 2010 46 70th birthday celebration for 23 Books received Sigfús Johnsen 24 Award of the Richardson Medal to 48 Glaciological diary Jo Jacka 54 New members Cover picture: Spiral icicle extruded from the tubular steel frame of a jungle gym in Moscow, November 2010. Photo: Alexander Nevzorov. Scanning electron micrograph of the ice crystal used in headings by kind permission of William P. Wergin, Agricultural Research Service, US Department of Agriculture EXCLUSION CLAUSE. While care is taken to provide accurate accounts and information in this Newsletter, neither the editor nor the International Glaciological Society undertakes any liability for omissions or errors.
    [Show full text]
  • Article Is Available On- Mand of Charles Wilkes, USN
    The Cryosphere, 15, 663–676, 2021 https://doi.org/10.5194/tc-15-663-2021 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Recent acceleration of Denman Glacier (1972–2017), East Antarctica, driven by grounding line retreat and changes in ice tongue configuration Bertie W. J. Miles1, Jim R. Jordan2, Chris R. Stokes1, Stewart S. R. Jamieson1, G. Hilmar Gudmundsson2, and Adrian Jenkins2 1Department of Geography, Durham University, Durham, DH1 3LE, UK 2Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK Correspondence: Bertie W. J. Miles ([email protected]) Received: 16 June 2020 – Discussion started: 6 July 2020 Revised: 9 November 2020 – Accepted: 10 December 2020 – Published: 11 February 2021 Abstract. After Totten, Denman Glacier is the largest con- 1 Introduction tributor to sea level rise in East Antarctica. Denman’s catch- ment contains an ice volume equivalent to 1.5 m of global sea Over the past 2 decades, outlet glaciers along the coast- level and sits in the Aurora Subglacial Basin (ASB). Geolog- line of Wilkes Land, East Antarctica, have been thinning ical evidence of this basin’s sensitivity to past warm periods, (Pritchard et al., 2009; Flament and Remy, 2012; Helm et combined with recent observations showing that Denman’s al., 2014; Schröder et al., 2019), losing mass (King et al., ice speed is accelerating and its grounding line is retreating 2012; Gardner et al., 2018; Shen et al., 2018; Rignot et al., along a retrograde slope, has raised the prospect that its con- 2019) and retreating (Miles et al., 2013, 2016).
    [Show full text]
  • The Dynamics and Mass Budget of Aretic Glaciers
    DA NM ARKS OG GRØN L ANDS GEO L OG I SKE UNDERSØGELSE RAP P ORT 2013/3 The Dynamics and Mass Budget of Aretic Glaciers Abstracts, IASC Network of Aretic Glaciology, 9 - 12 January 2012, Zieleniec (Poland) A. P. Ahlstrøm, C. Tijm-Reijmer & M. Sharp (eds) • GEOLOGICAL SURVEY OF D EN MARK AND GREENLAND DANISH MINISTAV OF CLIMATE, ENEAGY AND BUILDING ~ G E U S DANMARKS OG GRØNLANDS GEOLOGISKE UNDERSØGELSE RAPPORT 201 3 / 3 The Dynamics and Mass Budget of Arctic Glaciers Abstracts, IASC Network of Arctic Glaciology, 9 - 12 January 2012, Zieleniec (Poland) A. P. Ahlstrøm, C. Tijm-Reijmer & M. Sharp (eds) GEOLOGICAL SURVEY OF DENMARK AND GREENLAND DANISH MINISTRY OF CLIMATE, ENERGY AND BUILDING Indhold Preface 5 Programme 6 List of participants 11 Minutes from a special session on tidewater glaciers research in the Arctic 14 Abstracts 17 Seasonal and multi-year fluctuations of tidewater glaciers cliffson Southern Spitsbergen 18 Recent changes in elevation across the Devon Ice Cap, Canada 19 Estimation of iceberg to the Hansbukta (Southern Spitsbergen) based on time-lapse photos 20 Seasonal and interannual velocity variations of two outlet glaciers of Austfonna, Svalbard, inferred by continuous GPS measurements 21 Discharge from the Werenskiold Glacier catchment based upon measurements and surface ablation in summer 2011 22 The mass balance of Austfonna Ice Cap, 2004-2010 23 Overview on radon measurements in glacier meltwater 24 Permafrost distribution in coastal zone in Hornsund (Southern Spitsbergen) 25 Glacial environment of De Long Archipelago
    [Show full text]
  • Glacial Processes and Landforms-Transport and Deposition
    Glacial Processes and Landforms—Transport and Deposition☆ John Menziesa and Martin Rossb, aDepartment of Earth Sciences, Brock University, St. Catharines, ON, Canada; bDepartment of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON, Canada © 2020 Elsevier Inc. All rights reserved. 1 Introduction 2 2 Towards deposition—Sediment transport 4 3 Sediment deposition 5 3.1 Landforms/bedforms directly attributable to active/passive ice activity 6 3.1.1 Drumlins 6 3.1.2 Flutes moraines and mega scale glacial lineations (MSGLs) 8 3.1.3 Ribbed (Rogen) moraines 10 3.1.4 Marginal moraines 11 3.2 Landforms/bedforms indirectly attributable to active/passive ice activity 12 3.2.1 Esker systems and meltwater corridors 12 3.2.2 Kames and kame terraces 15 3.2.3 Outwash fans and deltas 15 3.2.4 Till deltas/tongues and grounding lines 15 Future perspectives 16 References 16 Glossary De Geer moraine Named after Swedish geologist G.J. De Geer (1858–1943), these moraines are low amplitude ridges that developed subaqueously by a combination of sediment deposition and squeezing and pushing of sediment along the grounding-line of a water-terminating ice margin. They typically occur as a series of closely-spaced ridges presumably recording annual retreat-push cycles under limited sediment supply. Equifinality A term used to convey the fact that many landforms or bedforms, although of different origins and with differing sediment contents, may end up looking remarkably similar in the final form. Equilibrium line It is the altitude on an ice mass that marks the point below which all previous year’s snow has melted.
    [Show full text]
  • Noaa 4860 DS1.Pdf
    PROPOSED ACTION: Issuance of an Incidental Harassment Authorization to the National Science Foundation and Antarctic Support Contract to Take Marine Mammals by Harassment Incidental to a Low-Energy Marine Geophysical Survey in the Dumont d’Urville Sea off the Coast of East Antarctica, January to March 2014. TYPE OF STATEMENT: Environmental Assessment LEAD AGENCY: U.S. Department of Commerce, National Oceanic and Atmospheric Administration National Marine Fisheries Service RESPONSIBLE OFFICIAL: Donna S. Wieting, Director, Office of Protected Resources, National Marine Fisheries Service FOR FURTHER INFORMATION: Howard Goldstein National Marine Fisheries Service Office of Protected Resources, Permits and Conservation Division 1315 East West Highway Silver Spring, MD 20910 301-427-8401 LOCATION: Selected regions of the Dumont d’Urville Sea in International Waters of the Southern Ocean off the coast of East Antarctica (Approximately 64º South, between 95 and 135º East, and 65º South, between 140 to 165º East) ABSTRACT: This Environmental Assessment analyzes the environmental impacts of the National Marine Fisheries Service, Office of Protected Resources, Permits and Conservation Division’s proposal to issue an Incidental Harassment Authorization to the National Science Foundation and Antarctic Support Contract for the taking, by Level B harassment, of small numbers of marine mammals, incidental to conducting a low-energy marine geophysical survey in the Dumont d’Urville Sea, January to March 2014. CONTENTS List of Abbreviations or Acronyms
    [Show full text]