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  • 1
    Online Resource
    Online Resource
    Validierungsarbeiten für die Verbesserung zukünftiger CryoSat-Produkte von Meereis-Dickenänderungen und Höhenänderungen kontinentaler Eisschilde und Schelfeise : Schlussbericht (2010)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Details Availability
    Keywords: Forschungsbericht ; Polargebiete ; Satellitenfernerkundung
    Type of Medium: Online Resource
    Pages: Online Ressource (42 S., 4,03 MB) , Ill., graph. Darst., Kt.
    URL: https://edocs.tib.eu/files/e01fb11/668659416.pdf
    URL: https://doi.org/10.2314/GBV:668659416
    URL: https://edocs.tib.eu/files/e01fb11/668659416l.pdf
    DOI: 10.2314/GBV:668659416
    Language: German
    Note: Förderkennzeichen BMWi 50EE0505 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden. - Auch als gedr. Ausg. vorhanden , Systemvoraussetzungen: Acrobat reader.
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  • 2
    Online Resource
    Online Resource
    Validierung von CryoSat-2 Produkten zu Meereis-Dickenänderungen und Höhenänderungen kontinentaler Eisschilde und Schelfeise : Schlussbericht (2014)
    Bremerhaven [u.a.]
    Details Availability
    Keywords: Forschungsbericht ; Polargebiete ; Satellitenfernerkundung
    Type of Medium: Online Resource
    Pages: Online-Ressource (59 S., 15,00 MB) , Ill., graph. Darst., Kt.
    URL: https://edocs.tib.eu/files/e01fb15/837524121.pdf
    URL: https://doi.org/10.2314/GBV:837524121
    DOI: 10.2314/GBV:837524121
    Language: German
    Note: Förderkennzeichen BMBF 50EE1008 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden , Systemvoraussetzungen: Acrobat reader.
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  • 3
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    Using airborne Ku-band altimeter waveforms to investigate winter accumulation and glacier facies on Austfonna, Svalbard (2013)
    Cambridge University Press
    Details
    Publication Date: 2013-11-13
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of The International Glaciological Society (IGS).
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    PAPER CURRENT
  • 4
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    Elevation Models of Antarctica and Greenland derived from CryoSat-2 in the period 2011 to 2013 (2014)
    PANGAEA
    In:  Supplement to: Helm, Veit; Humbert, Angelika; Miller, Heinz (2014): Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2. The Cryosphere, 8(4), 1539-1559, https://doi.org/10.5194/tc-8-1539-2014
    Details
    Publication Date: 2023-01-13
    Description: This study focuses on the present-day surface elevation of the Greenland and Antarctic ice sheets. Based on 3 years of CryoSat-2 data acquisition we derived new elevation models (DEMs) as well as elevation change maps and volume change estimates for both ice sheets. Here we present the new DEMs and their corresponding error maps. The accuracy of the derived DEMs for Greenland and Antarctica is similar to those of previous DEMs obtained by satellite-based laser and radar altimeters. Comparisons with ICESat data show that 80% of the CryoSat-2 DEMs have an uncertainty of less than 3 m ± 15 m. The surface elevation change rates between January 2011 and January 2014 are presented for both ice sheets. We compared our results to elevation change rates obtained from ICESat data covering the time period from 2003 to 2009. The comparison reveals that in West Antarctica the volume loss has increased by a factor of 3. It also shows an anomalous thickening in Dronning Maud Land, East Antarctica which represents a known large-scale accumulation event. This anomaly partly compensates for the observed increased volume loss of the Antarctic Peninsula and West Antarctica. For Greenland we find a volume loss increased by a factor of 2.5 compared to the ICESat period with large negative elevation changes concentrated at the west and southeast coasts. The combined volume change of Greenland and Antarctica for the observation period is estimated to be -503 ± 107 km**3/yr. Greenland contributes nearly 75% to the total volume change with -375 ± 24 km**3/yr.
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    Elevation Model of Antarctica derived from CryoSat-2 in the period 2011 to 2013, links to DEM and uncertainty map as GeoTIFF (2014)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Comment; pan-Antarctica; Uniform resource locator/link to raw data file
    Type: Dataset
    Format: text/tab-separated-values, 4 data points
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    DATA PANGAEA
  • 6
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    Elevation Model of Greenland derived from CryoSat-2 in the period 2011 to 2013, links to DEM and uncertainty map as GeoTIFF (2014)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Comment; Greenland; Uniform resource locator/link to raw data file
    Type: Dataset
    Format: text/tab-separated-values, 4 data points
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    DATA PANGAEA
  • 7
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    Airborne measurements during POLAR 6 campaign CryoVEx in 2011 with links to raw data files (2012)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2024-02-16
    Keywords: AC; Aircraft; Antarctica, East; CRYOVEX_1111190101; CRYOVEX_1111190202; CRYOVEX_1111200301; CRYOVEX_1111210401; CRYOVEX_1111230501; CRYOVEX_1111250601; CRYOVEX_1111250701; CRYOVEX_1111260801; CRYOVEX_1111270901; CRYOVEX_1111291001; CRYOVEX_1111301101; CRYOVEX_1112031201; CRYOVEX_1112041301; CRYOVEX_1112051401; CRYOVEX_1112121601; CRYOVEX_1112151701; CRYOVEX_1112191801; CryoVEx_ANT_2011/12; Date/Time of event; Date/Time of event 2; Event label; Indian Ocean; Latitude of event; Latitude of event 2; Longitude of event; Longitude of event 2; POLAR 6; Prydz Bay; Uniform resource locator/link to raw data file
    Type: Dataset
    Format: text/tab-separated-values, 88 data points
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    DATA PANGAEA
  • 8
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    Short-term geomorphic dynamics of the Yukon and Herschel Island coasts based on LIDAR DEMs from 2012 and 2013 (2014)
    In:  EPIC3EUCOP4 European Conference on Permafrost, Evora, Portugal, 2014-06-19-2014-06-21
    Details
    Publication Date: 2014-06-26
    Description: Arctic permafrost coasts, especially when they are unconsolidated and ground ice rich, are extremely vulnerable to climate change. Rising temperatures of air and seawater, lengthening of the open-water season and increase in storm events are likely to prompt higher rates of coastal erosion and consequently increase the rate of land loss and material transport to the near-shore zone. Many studies have addressed this issue by compiling rates of shoreline erosion over the past fifty to sixty years to find trends, yet few investigations have attempted to look at it in three dimensions and at annual time scales, although erosion of Arctic coasts is known to be very complex and nonlinear. This study focuses on high resolution short-term (one year) erosion rates and geomorphic change. It is based on DEMs that were obtained from LIDAR surveys of the Yukon Coast and Herschel Island during the AIRMETH campaigns in 2012 and 2013. The DEMs were processed to obtain a horizontal resolution of 1 meter and serve as an elevation source from which the comparison was made. The elevations from the 2012 DEM were then deducted from elevations in 2013 to obtain erosion and accumulation values for each pixel. Preliminary results show that coastal retreat encompasses a range of processes acting at different temporal and spatial scales. They can be divided into denudation and abrasion processes. Denudation is the various types of mass wasting, such as translational slides, active layer detachments or retrogressive thaw slumps. The material delivered from these abrupt events is made available for abrasion, which is transferring the material to the shoreface at longer time scales. The accumulated material temporarily protects cliffs from incident wave energy and abrasion is reactivated when the material is removed. The erosion from gullies and thermo-erosional valleys is another form of material delivery to coast. Shoreline retreats from 2 to 5 meters were recorded on the most exposed parts of the coast, while vertical changes of cliffs account locally for more than 10 meters and extend up to 20 meters laterally. Locations where these high numbers are observed are often characterised by the adjacent accumulation of material on the beach. This study shows that the pathways for the transfer of material from the coast to the sea are very diverse and are often limited by the ability of abrasion to remove material delivered by the mass wasting of coastal bluffs.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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    PAPER (OA)
  • 9
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    Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2 (2014)
    In:  EPIC3The Cryosphere, 8(4), pp. 1539-1559
    Details
    Publication Date: 2017-10-17
    Description: This study focuses on the present-day surface elevation of the Greenland and Antarctic ice sheets. Based on 3 years of CryoSat-2 data acquisition we derived new elevation models (DEMs) as well as elevation change maps and volume change estimates for both ice sheets. Here we present the new DEMs and their corresponding error maps. The accuracy of the derived DEMs for Greenland and Antarctica is similar to those of previous DEMs obtained by satellite-based laser and radar altimeters. Comparisons with ICESat data show that 80% of the CryoSat-2 DEMs have an uncertainty of less than 3 m ± 15 m. The surface elevation change rates between January 2011 and January 2014 are presented for both ice sheets. We compared our results to elevation change rates obtained from ICESat data covering the time period from 2003 to 2009. The comparison reveals that in West Antarctica the volume loss has increased by a factor of 3. It also shows an anomalous thickening in Dronning Maud Land, East Antarctica which represents a known large-scale accumulation event. This anomaly partly compensates for the observed increased volume loss of the Antarctic Peninsula and West Antarctica. For Greenland we find a volume loss increased by a factor of 2.5 compared to the ICESat period with large negative elevation changes concentrated at the west and southeast coasts. The combined volume change of Greenland and Antarctica for the observation period is estimated to be −503 ± 107 km3 yr−1. Greenland contributes nearly 75% to the total volume change with −375 ± 24 km3 yr−1.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 10
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    New Insights in the Existence of Lakes Beneath the Recovery Glacier Drainage Basin, Antarctica (2014)
    In:  EPIC3AGU Fall Meeting, San Francisco, 2014-12-15-2014-12-19
    Details
    Publication Date: 2017-10-17
    Description: The Recovery Glacier is draining about 8% of the East Antarctic ice sheet and feeds into the Filchner Ice Shelf. There were suggestions that the dynamics of the glacier is driven by large subglacial lakes that initiate the ice stream flow (Bell et al., 2008). As the Recovery Glacier is one of the least surveyed ice streams due to its remote location, this hypothesis could not be tested rigorously so far. In austral summer 2013/14 AWI carried out a survey of the Recovery Glacier including radio echo sounding, gravimetry, magnetics, and laser scanner. In total more than 22000 km survey lines were flown. Here we present an ice thickness map of the main trunk of the Recovery Glacier, as well as its tributaries Blackwall and Ramp glaciers. The ice thickness varies between 70 m in the vicinity of the Shackleton Range and nearly 3800 m close to the Bell lakes. Using different DEMs including one CryoSat-2 DEM (Helm et al., 2014), we determine the basal topography and the hydraulic head. We estimate the basal reflection coefficient and assess by this locations with potentially wet ice base. The distribution shows that few of the formerly proposed lakes show indeed a wet base, while others are missing clear lake like basal reflections.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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