Comprehensive Annual Ice Sheet Velocity Mapping Using Landsat-8, Sentinel-1, and RADARSAT-2 Data
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TLDR
A methodology to process the SAR and optical data in a synergistic fashion and automatically calibrate, mosaic, and integrate these data sets together into seamless, ice-sheet-wide, products is described.Abstract:
Satellite remote sensing data including Landsat-8 (optical), Sentinel-1, and RADARSAT-2 (synthetic aperture radar (SAR) missions) have recently become routinely available for large scale ice velocity mapping of ice sheets in Greenland and Antarctica. These datasets are too large in size to be processed and calibrated manually as done in the past. Here, we describe a methodology to process the SAR and optical data in a synergistic fashion and automatically calibrate, mosaic, and integrate these data sets together into seamless, ice-sheet-wide, products. We employ this approach to produce annual mosaics of ice motion in Antarctica and Greenland with all available data acquired on a particular year. We find that the precision of a Landsat-8 pair is lower than that of its SAR counterpart, but due to the large number of Landsat-8 acquisitions, combined with the high persistency of optical surface features in the Landsat-8 data, we obtain accurate velocity products from Landsat that integrate well with the SAR-derived velocity products. The resulting pool of remote sensing products is a significant advance for observing changes in ice dynamics over the entire ice sheets and their contribution to sea level. In preparation for the next generation sensors, we discuss the implications of the results for the upcoming NASA-ISRO SAR mission (NISAR).read more
Citations
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Journal ArticleDOI
Four decades of Antarctic Ice Sheet mass balance from 1979-2017.
Eric Rignot,Eric Rignot,Jeremie Mouginot,Jeremie Mouginot,Bernd Scheuchl,Michiel R. van den Broeke,Melchior van Wessem,Mathieu Morlighem +7 more
TL;DR: During the entire period, the mass loss concentrated in areas closest to warm, salty, subsurface, circumpolar deep water (CDW), consistent with enhanced polar westerlies pushing CDW toward Antarctica to melt its floating ice shelves, destabilize the glaciers, and raise sea level.
Journal ArticleDOI
BedMachine v3: Complete Bed Topography and Ocean Bathymetry Mapping of Greenland From Multibeam Echo Sounding Combined With Mass Conservation.
Mathieu Morlighem,Christopher Williams,Christopher Williams,Eric Rignot,Eric Rignot,L. An,Jan Erik Arndt,Jonathan L. Bamber,Ginny A. Catania,Nolwenn Chauché,Julian A. Dowdeswell,Boris Dorschel,Ian Fenty,Kelly A. Hogan,Ian M. Howat,Alun Hubbard,Martin Jakobsson,Thomas M. Jordan,Kristian K. Kjeldsen,Kristian K. Kjeldsen,Kristian K. Kjeldsen,Romain Millan,Larry A. Mayer,Jeremie Mouginot,Brice Noël,C. O'Cofaigh,S. J. Palmer,Søren Rysgaard,Søren Rysgaard,Helene Seroussi,Martin J. Siegert,Patricia Slabon,Fiammetta Straneo,M. R. van den Broeke,W. Weinrebe,M. Wood,K. B. Zinglersen +36 more
TL;DR: A new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness data through a mass conservation approach is presented, yielding major improvements over previous data sets, particularly in the marine‐terminating sectors of northwest and southeast Greenland.
Journal ArticleDOI
Current status of Landsat program, science, and applications
Michael A. Wulder,Thomas R. Loveland,David P. Roy,Christopher J. Crawford,Jeffrey G. Masek,Curtis E. Woodcock,Richard G. Allen,Martha C. Anderson,Alan Belward,Warren B. Cohen,John L. Dwyer,Angela Erb,Feng Gao,Patrick Griffiths,Dennis L. Helder,Txomin Hermosilla,Txomin Hermosilla,James D. Hipple,Patrick Hostert,M. Joseph Hughes,Justin L. Huntington,David M. Johnson,Robert E. Kennedy,Ayse Kilic,Zhan Li,Leo Lymburner,Joel McCorkel,Nima Pahlevan,Ted Scambos,Crystal B. Schaaf,John R. Schott,Yongwei Sheng,James C. Storey,Eric Vermote,James E. Vogelmann,Joanne C. White,Randolph H. Wynne,Zhe Zhu,Zhe Zhu +38 more
TL;DR: The programmatic developments and institutional context for the Landsat program and the unique ability of Landsat to meet the needs of national and international programs are described and the key trends in Landsat science are presented.
Journal ArticleDOI
Forty-six years of Greenland Ice Sheet mass balance from 1972 to 2018
Jeremie Mouginot,Jeremie Mouginot,Eric Rignot,Eric Rignot,Anders A. Bjørk,Anders A. Bjørk,Michiel R. van den Broeke,Romain Millan,Mathieu Morlighem,Brice Noël,Bernd Scheuchl,M. Wood +11 more
TL;DR: Even in years of high SMB, enhanced glacier discharge has remained sufficiently high above equilibrium to maintain an annual mass loss every year since 1998, and the acceleration in mass loss switched from positive in 2000–2010 to negative in 2010–2018, which illustrates the difficulty of extrapolating short records into longer-term trends.
Journal ArticleDOI
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet
Mathieu Morlighem,Eric Rignot,Tobias Binder,Donald D. Blankenship,Reinhard Drews,Reinhard Drews,Graeme Eagles,Olaf Eisen,Fausto Ferraccioli,René Forsberg,Peter T. Fretwell,Vikram Goel,Jamin S. Greenbaum,Hilmar Gudmundsson,Jingxue Guo,Veit Helm,Coen Hofstede,Ian M. Howat,Angelika Humbert,Wilfried Jokat,Nanna B. Karlsson,Won Sang Lee,Kenichi Matsuoka,Romain Millan,Jeremie Mouginot,John Paden,Frank Pattyn,Jason L. Roberts,Sebastian Rosier,Antonia Ruppel,Helene Seroussi,Emma Smith,Daniel Steinhage,Bo Sun,Michiel R. van den Broeke,Tas van Ommen,Melchior van Wessem,Duncan A. Young +37 more
TL;DR: In this paper, a high-resolution and physically based description of Antarctica bed topography using mass conservation is presented, revealing previously unknown basal features with major implications for glacier response to climate change.
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