C008
Altimetry of the Polar Regions: CryoSat-2, Operation IceBridge, ICESat-2, and Beyond

Session ID#: 163119

Session Description:
Satellite and airborne radar and laser altimetry have transformed our capacity to study the cryosphere. Continuous altimetry measurements since 1992 have painted a unique picture of how Earth’s glaciers, ice sheets, ice shelves, sea ice, and polar oceans evolve. As global temperatures have risen, so too have rates of snowfall, ice melting, decline of sea ice cover (decreases albedo) and mass loss from ice sheets (increases sea level). NASA-IceBridge completed its decade-long mission in 2019, bridging the gap between ICESat and ICESat-2 with ice thickness data and altimetry. The two current polar satellite altimeters (ESA CryoSat-2 since 2010; NASA ICESat-2 since 2018) are continuing the altimetry record, and also delivering data at high spatial resolution, allowing studies of small-scale features, e.g. rifts and melt ponds. This session will demonstrate the vital role of both continuous and high-resolution altimetry in advancing our understanding of the processes involved in a changing cryosphere.
Index Terms:

0726 Ice sheets [CRYOSPHERE]
0750 Sea ice [CRYOSPHERE]
0758 Remote sensing [CRYOSPHERE]
1218 Mass balance [GEODESY AND GRAVITY]

Primary Convener:  Susheel Adusumilli, Scripps Institution of Oceanography, La Jolla, CA, United States
Conveners:  Ellen Buckley, Brown University, Providence, RI, United States, Helen Amanda Fricker, University of California, San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States and Steven Fons, NASA Goddard Space Flight Center, Greenbelt, MD, United States
 
Characterizing Winter/Spring Arctic Ocean sea-ice elevation distribution using NASA's ICESat-2 and ATM data (1058918)
Donghui Yi, Global Science and Technology Inc Greenbelt, Greenbelt, MD, United States, Sinéad Louise Farrell, University of Maryland College Park, College Park, United States, Laurence N Connor, NOAA/NESDIS/STAR, College Park, MD, United States, Walter H F Smith, NOAA Lab Satellite Altimetry, College Park, MD, United States, Kyle Duncan, University of Maryland College Park, College PARK, MD, United States and John M. Kuhn, NOAA Laboratory for Satellite Altimetry, College Park, United States
 
Intercomparing Arctic winter radar and laser freeboards obtained from CryoSat-2, AltiKa and ICESat-2 over the common mission period October 2018 – April 2021 (1061265)
Jack Landy1, Isolde Glissenaar2, Claude de Rijke Thomas2, Isobel R. Lawrence3, Alek Petty4, Geoffrey Joseph Dawson5, Robbie Mallett6, Michel Tsamados7 and ESA Polar+ Snow on Sea Ice Team, (1)The Arctic University of Norway, Tromsø, Norway, (2)University of Bristol, Bristol, United Kingdom, (3)European Space Agency, European Space Research Institute, Frascati, Italy, (4)Earth System Science Interdisciplinary Center, College PARK, MD, United States, (5)University of Bristol, School of Geographical Sciences, Bristol, United Kingdom, (6)University College London, Earth Sciences, London, United Kingdom, (7)UCL CPOM, London, United Kingdom
 
Elevation Observations and Waveform Analysis of NASA’s Airborne Topographic Mapper (ATM) Lidar Data over Arctic and Antarctic Sea Ice Involving Subsurface Penetration and Volume Scattering of Green (532 nm) Laser Light (1068209)
Michael Studinger1, Marco Bagnardi2, Jeremy Harbeck3, Alvaro Ivanoff1, Nathan T Kurtz4, Alek Petty5, Benjamin Eaton Smith6, Tyler C Sutterley7 and Rachel Tilling1, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)Goddard Space Flight Center, Greenbelt, MD, United States, (3)ADNET Systems Inc. Greenbelt, Greenbelt, MD, United States, (4)NASA Goddard, Greenbelt, MD, United States, (5)Earth System Science Interdisciplinary Center, College PARK, MD, United States, (6)University of Washington, Seattle, WA, United States, (7)Applied Physics Laboratory University of Washington, Polar Science Center, Seattle, WA, United States
 
New approaches to processing radar altimetry waveforms over complex ice sheet topography (1068887)
Qi Huang1, Malcolm McMillan1, Alan Stephen Muir2 and Joe Phillips1, (1)Lancaster University, Lancaster, United Kingdom, (2)University College London, London, United Kingdom
 
Automated Detection and Depth Measurement of Melt Ponds on Arctic Sea Ice in ICESat-2ATLAS Data: The Density Dimension Algorithm for Bifurcating Sea-Ice Reflectors (DDA-bifurcate-seaice) (1083066)
Huilin Han, University of Colorado Boulder, Geomathematics, Remote Sensing and Cryospheric Sciences Laboratory; Department of Computer Sciences, Boulder, United States, Ute C Herzfeld, University Colorado Boulder, Geomathematics, Remote Sensing and Cryospheric Sciences Laboratory; Electrical, Computer and Energy Engineering, Boulder, United States, Thomas Trantow, University of Colorado Boulder, ECEE, Boulder, CO, United States, Ellen Buckley, Brown University, Providence, RI, United States, Sinéad Louise Farrell, University of Maryland College Park, College Park, United States and Matthew William Lawson, University of Colorado Boulder, Computer Science, Boulder, CO, United States
 
Evolution of present and former ice shelves in North Greenland during the last 30 years (1088774)
Romain Millan1, Jeremie Mouginot2, Anders Bjork3, Pierre Mathiot4,5 and Nicolas C. Jourdain4, (1)University of Copenhagen, København K, Denmark, (2)University of Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, Grenoble, France, (3)University of Copenhagen, Department of Geosciences and Natural Resource Management, København K, Denmark, (4)CNRS, Saint-Martin-d'Heres, France, (5)Université Grenoble Alpes, Grenoble, France
 
Ice-sheet subannual volume variations from ICESat-2 laser altimetry (1107953)
Benjamin Eaton Smith, Applied Physics Laboratory University of Washington, Polar Science Center, Seattle, WA, United States, Suzanne Dickinson, Univ Washington, Seattle, WA, United States, Denis Felikson, University of Texas at Austin, Austin, United States, Helen Amanda Fricker, University of California, San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States, Benjamin P Jelley, KBR, NASA Goddard Space Flight Center, Greenbelt, United States, Brooke Medley, NASA Goddard Space Flight Center, Greenbelt, MD, United States, Mathieu Morlighem, University of California - Irvine, Department of Earth Sciences, Irvine, United States, Laurence Padman, Earth & Space Research, Corvallis, OR, United States, Tyler C Sutterley, University of California Irvine, Irvine, United States and Tom Neumann, NASA Goddard Space Flight Ctr., Greenbelt, MD, United States
 
Variations in sea ice thickness over Weddell Sea for 2019-2020 using ICESat-2 (1118330)
Mansi Joshi, University of Texas at San Antonio, NASA Center for Advanced Measurements in Extreme Environments (CAMEE),Department of Civil and Environmental Engineering, San Antonio, TX, United States, Stephen F Ackley, University of Texas at San Antonio, NASA Center for Advanced Measurements in Extreme Environments (CAMEE), San Antonio, TX, United States, Alberto M Mestas-Nunez, University of Texas at San Antonio, NASA Center for Advanced Measurements in Extreme Environments(CAMEE)/Department of Earth and Planetary Sciences, San Antonio, United States and Grant J Macdonald, The University of Victoria, Victoria, Canada
 
Advances in Radar Altimetry Processing and Understanding over Ice Sheets (1123918)
Malcolm McMillan1, Maya Suryawanshi1, Joe Phillips1, Robert Wassink1, Jennifer Maddalena1, Qi Huang1, Fanny Piras2, Alan Stephen Muir3, David Brockley3, Thomas Slater4, Jérémie Aublanc5, Jerome Bouffard6, Alessandro Di Bella7, Marcus Engdahl8 and Pierre Féménias9, (1)Lancaster University, Lancaster, United Kingdom, (2)Collecte Localisation Satellites, Ramonville-Saint-Agne, France, (3)University College London, London, United Kingdom, (4)University of Leeds, Leeds, LS2, United Kingdom, (5)CLS Collecte Localisation Satellites, Plouzané, France, (6)European Space Research Institute, Frascati, Italy, (7)European Space Agency, Villanueva De La Can, Spain, (8)ESA-ESRIN, Frascati, Italy, (9)ESA - European Space Research Institute, Frascati, Italy
 
Improving Antarctic Ice Sheet Mass Balance using ICESat-2, GRACE/GRACE- FO, GPS, and SMB Models (1130130)
Chia Chun Liang, University of California Irvine, Irvine, CA, United States, Isabella Velicogna, UCI, Irvine, CA, United States, Geruo A, University of California Irvine, Department of Earth System Science, Irvine, CA, United States and Tyler C Sutterley, University of California Irvine, Irvine, United States
 
Towards Automated Generation of Ice-Sheet Wide Supraglacial Meltwater Depth Measurements from ICESat-2 Data, Using High-Throughput Computing (1130521)
Philipp Sebastian Arndt, Scripps Institution of Oceanography, La Jolla, CA, United States and Helen Amanda Fricker, University of California, San Diego, Scripps Institution of Oceanography, La Jolla, CA, United States
 
Bounds on and Evaluation of Sea Ice Concentration Estimates from ICESat-2 Linear Ice Fraction (1150171)
Madelyn Stewart1,2, Pittayuth Yoosiri2, Christopher Horvat2,3 and Ellen Buckley4, (1)Yale University, New Haven, CT, United States, (2)Brown University, Providence, United States, (3)University of Auckland, Auckland, New Zealand, (4)Brown University, Providence, RI, United States
 
CryoSat-2/ICESat-2 integrated time series and comparison of shoreline evolution in Antarctic active subglacial lakes (1161331)
Wilson Sauthoff, Colorado School of Mines, Geophysics, Golden, United States, Matthew Siegfried, Colorado School of Mines, Department of Geophysics, Hydrologic Science & Engineering Program, Golden, CO, United States and Benjamin Eaton Smith, University of Washington, Seattle, WA, United States
 
ICESat-2 at 4 Years: Status, Outlook, and Contributions to Polar Science (1162760)
Tom Neumann, NASA Goddard Space Flight Center, Greenbelt, MD, United States, Lori A Magruder, University of Texas at Austin, Austin, TX, United States and Nathan T Kurtz, NASA Goddard, Greenbelt, MD, United States
 
Reconstruction of Greenland Ice Sheet Mass Balance Using Laser Altimetry Measurements (1172172)
Hui Gao1, Beata M Csatho1, Anton F Schenk1 and Brooke Medley2, (1)University at Buffalo, Department of Geology, Buffalo, NY, United States, (2)NASA Goddard Space Flight Center, Greenbelt, MD, United States
 
GNSS-Reflectometry for Precision Land Ice Altimetry: Applicable Locations and Initial Results (1173947)
Sophie Anderson1, Yang Wang2 and Y. Jade Morton2, (1)University of Colorado at Boulder, Smead Aerospace Engineering Sciences, Boulder, United States, (2)University of Colorado at Boulder, Smead Aerospace Engineering Sciences, Boulder, CO, United States
 
The Seasonal Cycle of Arctic Snow Depth: Linkages to ICESat-2 Summer Freeboards and Albedo (1185176)
Sahra Kacimi, NASA JPL, Pasadena, CA, United States, Melinda Webster, University of Alaska Fairbanks, Fairbanks, United States and Ron Kwok, Applied Physics Laboratory University of Washington, Polar Science Center, Seattle, United States
 
Tracking Surface Roughness and Strain on Petermann Glacier using ICESat-2 and Sentinel-1 Data (1186116)
Amanda Willet, Pennsylvania State University Main Campus, Earth and Mineral Sciences, University Park, PA, United States, Sridhar Anandakrishnan, Pennsylvania State University, University Park, PA, United States, Richard B Alley, Pennsylvania State University, Geosciences, and Earth and Environmental Systems Institute, University Park, United States and Judit Maria Maria Gonzalez Santana, The Pennsylvania State University, Department of Geosciences, University Park, PA, United States
 
Rapid changes in the Nioghalvfjerdsfjorden Glacier, Northeast Greenland, grounding zone revealed by altimetry-DEM combined reconstruction (1189201)
Ash Narkevic1, Beata M Csatho2 and Anton F Schenk2, (1)University at Buffalo, Department of Geological Sciences, Buffalo, NY, United States, (2)University at Buffalo, Department of Geology, Buffalo, NY, United States
 
Evaluation of Digital Surface Models Determined From UAS-Based Cameras Over Great Lakes Ice Features (1191536)
Medha Gelli, NOAA Ernest F. Hollings Undergraduate Scholarship, College Park, MD, United States, Sean Helfrich, NESDIS, NOAA, Center for Satellite Applications and Research, College Park, United States, Grant Austin Williams, University of Maryland UAS Test Site, California, MD, United States, Francis Padula, NOAA College Park, College Park, MD, United States and Boryana Efremova, NASA Goddard Space Flight Center, Greenbelt, United States
 
Mass balance and stability of Western Ross Sea ice tongues by laser altimetry and SAR ice surface velocities. (1196898)
Rodrigo Gomez-Fell1, Oliver Marsh2, Christian Wild3, Wolfgang Rack1 and Heather Purdie4, (1)University of Canterbury, Gateway Antarctica, Christchurch, New Zealand, (2)British Antarctic Survey, Cambridge, United Kingdom, (3)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, United States, (4)University of Canterbury, Christchurch, New Zealand
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