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  • Data  (82)
  • 2020-2024  (80)
  • 2015-2019  (2)
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  • 2020-2024  (80)
  • 2015-2019  (2)
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  • 1
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    Remotely sensed surface velocities, Lagrangian basal melt rates, terminus positions, grounding lines as well as modelling results of Peterman Glacier (northern Greenland) (2018)
    PANGAEA
    In:  Supplement to: Rückamp, Martin; Neckel, Niklas; Berger, Sophie; Humbert, Angelika; Helm, Veit (2019): Calving Induced Speedup of Petermann Glacier. Journal of Geophysical Research-Earth Surface, https://doi.org/10.1029/2018JF004775
    Details
    Publication Date: 2023-03-16
    Description: This study assesses the response on ice dynamics of Petermann Glacier, a major outlet glacier in northern Greenland, to the 2012 and a possible future calving event. So far Petermann Glacier has been believed to be dynamically stable as another large calving event in 2010 had no significant impact on flow velocity or grounding line retreat. By analyzing a time series of remotely sensed surface velocities, we find an average acceleration of 10% between winter 2011/2012 and winter 2016/2017. This increase in surface velocity is not linear but can be separated into two parts, starting in 2012 and 2016 respectively. By conducting modelling experiments, we show that the first speed-up can be directly connected to the 2012 calving event, while the second speed-up is not captured. However, on recent remote sensing imagery newly developing fractures are clearly visible ~12,km upstream from the terminus, propagating from the eastern fjord wall to the center of the ice tongue, indicating a possible future calving event. By including these fracture zones as a new terminus position in the modelling domain we are able to reproduce the second speed-up, suggesting that surface velocities remain on the 2016/2017 level after the anticipated calving event. This indicates that, from a dynamical point of view, the terminus region has already detached from the main ice tongue.
    Keywords: AWI_Glac; File format; File name; File size; Glaciology @ AWI; North Greenland; Petermann_Glacier; RADAR; Radar profile; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Time series of lake size changes in Northeast Greenland (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: This dataset contains outline polygons and water area time series of supraglacial lakes at the two main glacier systems of the Northeast Greenland Ice Stream, Nioghalvfjerdsbræ (also known as 79°N Glacier) and Zachariæ Isstrøm. The dataset was derived from Polarimetric Synthetic Aperture Radar observations (PolSAR) of the ESA satellites Sentinel-1A and Sentinel-1B during 2017-2020 and consists of a polygon file defining the lake outline definitions, a NetCDF file containing time series of water area and further parameters for each lake and a PDF with further details to the other files content. It was created as part of the European Union's Horizon 2020 research and innovation programme via project iCUPE (Integrative and Comprehensive Understanding on Polar Environments).
    Keywords: Greenland; Greenland ice sheet; NE_Greenland; remote sensing of ice sheet hydrology; SAR polarimetry; supraglacial lakes
    Type: Dataset
    Format: application/zip, 1.8 MBytes
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Drainage basin delineation for outlet glaciers of Northeast Greenland based on Sentinel-1 ice velocities and TanDEM-X elevations (2019)
    PANGAEA
    In:  Supplement to: Krieger, Lukas; Floricioiu, Dana; Neckel, Niklas (2020): Drainage basin delineation for outlet glaciers of Northeast Greenland based on Sentinel-1 ice velocities and TanDEM-X elevations. Remote Sensing of Environment, 237, 111483, https://doi.org/10.1016/j.rse.2019.111483
    Details
    Publication Date: 2023-04-29
    Description: The drainage divides of ice sheets separate the overall glaciated area into multiple sectors. These drainage basins are essential for partitioning mass changes of the ice sheet, as they specify the area over which basin specific measurements are integrated. The delineation of drainage basins on ice sheets is challenging due to their gentle slopes accompanied by local terrain disturbances and complex patterns of ice movement. Until now, in Greenland the basins have been mostly delineated along the major ice divides, which results in large drainage sectors containing multiple outlet glaciers. However, when focusing on measuring glaciological parameters of individual outlet glaciers, more detailed drainage basin delineations are needed. Here we present for the first time a detailed and fully traceable approach that combines ice sheet wide velocity measurements by Sentinel-1 and the high resolution TanDEM-X global DEM to derive individual glacier drainage basins. We delineated catchments for the Northeast Greenland Ice Sheet with a modified watershed algorithm and present results for 31 drainage basins. Even though validation of drainage basins remains a difficult task, we estimated basin probabilities from Monte-Carlo experiments and applied the method to a variety of different ice velocity and DEM datasets finding discrepancies of up to 16% in the extent of catchment areas. The proposed approach has the potential to produce drainage areas for the entirety of the Greenland and Antarctic ice sheets.
    Keywords: Drainage Basin; Glacier Catchment; Greenland; Ice Sheet; NorthEast_Greenland; Watershed
    Type: Dataset
    Format: application/zip, 232.1 kBytes
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    GNSS measurements at station GPS-GL-45 on 79°N Glacier in 2017 (Waypoint processing) (2021)
    PANGAEA
    Details
    Publication Date: 2023-11-09
    Keywords: 79°N Glacier; ALTITUDE; AWI Arctic Land Expedition; DATE/TIME; GL-Land_2017_iGRIFF; GNSS; GNSS Receiver; GPS; GPS-GL-45; Greenland; iGRIFF 79°N Glacier Expedition; LATITUDE; LONGITUDE; Nioghalvfjerdsbraeen Glacier; Northeast Greenland; Waypoint GravNav 8.8 processing software
    Type: Dataset
    Format: text/tab-separated-values, 0 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 5
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    Locations, outlines and ICESat-2 tracks of active lakes at the onset of the Jutulstraumen Glacier (Antarctica) (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-17
    Description: We analysed a 6 year time series of displacement maps from Sentinel-1 SAR interferometry in the upstream region of Dronning Maud Lands Jutulstraumen Glacier (Antarctica). Our results reveal short-term cascade-like events of subsidence and uplift of the ice surface, which we interpret as drainage and filling of subglacial water pockets. This indicates a periodic transport of subglacial water through an interconnected drainage system. The water re-location events in this study are located in a slow flowing region 225~km upstream of the grounding line. An examination of high-resolution ultra-wideband radar data and the hydropotential gradient reveals that subglacial water is moving downstream along a canyon-like system of local valleys.
    Keywords: AC; Aircraft; Antarctica; AWI UWB; DInSAR; Dronning Maud Land; Dronning Maud Land, Antarctica; ICESat-2; JuRaS, CHIRP; Jutulstraumen; Jutulstraumen_Glacier; MULT; Multiple investigations; P6_215_UWB_2018_1812220301; P6_215_UWB_2018_1812240401; P6_215_UWB_2018_1812260501; P6_215_UWB_2018_1812260602; P6_215_UWB_2018_1812270701; P6_215_UWB_2018_1812270802; P6-215_UWB_2018; POLAR 6; Sentinel-1; subglacial hydrology; subglacial lakes
    Type: Dataset
    Format: application/zip, 188.5 kBytes
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Aerial Orthophoto of the EastGRIP drill camp (North-East Greenland), May 2018 (2021)
    PANGAEA
    Details
    Publication Date: 2024-05-17
    Description: We present an orthographic photo (GeoTIFF) from the EGRIP-NOR-2018 campaign at the onset region of the Northeast Greenland Ice Stream (NEGIS). The data has been acquired in May 2018 with the onboard camera of AWIs (Alfred Wegener Institutes) Polar6 aircraft. The image is centered at the location of the drill site of the East Greenland Ice-Core Project (EastGRIP). The orthophotos were generated with OpenDroneMap (https://www.opendronemap.org/).
    Keywords: East Greenland Ice-core Project; EGRIP; EGRIP-NOR; EGRIP-NOR-18; MULT; Multiple investigations; P6-211_EGRIP_NOR_2018; POLAR 6
    Type: Dataset
    Format: application/zip, 19.8 MBytes
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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    Sea ice drift and surface temperature from autonomous measurements from buoy 2021C40, deployed during MELTEX 2021 (2024)
    PANGAEA
    Details
    Publication Date: 2024-05-17
    Description: Sea ice drift and surface temperature were measured by the Compact Air-Launched Ice Beacon (CALIB) 2021C40 drifting on Arctic sea ice deployed by air-plane drop off during MELTEX 2021. The time series describes the position and additional parameters of the buoy between 29 Jul 2021 and 24 Dec 2022 in sample intervals of 1 hour. The data set has been processed, including the flagging of obvious inconsistencies in position. The position is flagged if the drift velocity exceeds a threshold (Quality flag, position = 1), if the position exceeds extreme values, such as longitude 〉 360 deg (Quality flag, position = 2), and if the position is exactly 0.0 (Quality flag, position = 4). These quality flag values can be sums of each other.
    Keywords: 2021C40; autonomous platform; AWI_SeaIce; buoy; Buoy, Compact Air-Launched Ice Beacon; CALIB; Current sea ice maps for Arctic and Antarctic; DATE/TIME; drift; Global positioning system, time since last fix; IABP; International Arctic Buoy Program; LATITUDE; LONGITUDE; meereisportal.de; MELTEX-III, MACS@79,MACS@NG; P6_225_MELTEX_2021_2021C40; P6-225_MELTEX_2021; POLAR 6; Quality flag, position; sea ice drift; Sea Ice Physics @ AWI; Temperature, technical
    Type: Dataset
    Format: text/tab-separated-values, 34962 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 8
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    Seismic reflection data of a basal channel and ocean cavity at the ice shelf-grounding line area of Support Force Glacier, Filchner Ice Shelf, Antarctica (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Support Force Glacier (SFG) is a large ice stream feeding into the Filchner Ice Shelf. The active seismic survey is recorded at the sheet-shelf transition of SFG. We map the bed while grounded, the ocean cavity around a surface channel at the ice shelf and its counterpart at the base, the basal channel, and the seabed. The survey consists of 5 seismic reflection profiles, 2 along-flow profiles and 3 across-flow profiles. The 2.42GB seismic data were recorded with a 300 m long streamer consisting of 96 30Hz p-wave sensors. The sample rate is 0.5 ms, record length 3000 ms. The data is single fold, shot spacing is 150 m: line name: profile TC paper: direction: #shots: - 20170501 profile I along-flow 291 shots - 20170502 profile III across-flow 28 shots - 20170503 profile II along-flow 71 shots - 20170504 profile IV across-flow 40 shots - 20170506 profile V across-flow 50 shots Presented are for each line (20170501 used as example): - The raw shots: 20170501_RAW_SHOTS_EDITS_GEOM.segy - The Kirchhoff migrated and depth converted profiles: 20170501stat_TXmig_Zconv.segy - The shot x,y,z coordinates in longitude, latitude and surface height in meters above sea level (z, WGS84 ellipsoid): 20170501_GPS.txt
    Keywords: 300 m snow streamer with 96 gimballed 30 Hz vertical compressional wave (P-wave) sensors; ANT-Land_2016/17_FISP; AWI Antarctic Land Expedition; Binary Object; Binary Object (File Size); Event label; Filchner Ice Shelf Project; File content; FISP; FISP_2016-2017_20170501; FISP_2016-2017_20170502; FISP_2016-2017_20170503; FISP_2016-2017_20170504; FISP_2016-2017_20170506; Ice-shelf Channels; profile I; profile II; profile III; profile IV; profile V; Snow streamer; SSTREAM
    Type: Dataset
    Format: text/tab-separated-values, 54 data points
    Location Call Number Limitation Availability
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  • 9
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    Line-of-Sight Velocities of Priestley Glacier, Antarctica, aquired with Terrestrial Radar Interferometry (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: These data were aquired with a Terrestrial Radar Interferometer overlooking the grounding zone of Priestley Glacier, Antarctica. The time series contains line-of-sight velocities averaged over 3 h over an approximately 8 day period in November 2018. Tidal modulation of ice streams and their adjacent ice shelves is a real-world experiment to understand ice-dynamic processes. We observe the dynamics of Priestley Glacier, Antarctica, using Terrestrial Radar Interferometry (TRI) and GNSS. Ocean tides are predominantly diurnal but horizontal GNSS displacements oscillate also semi-diurnally. The oscillations are strongest in the ice shelf and tidal signatures decay near-linearly in the TRI data over 〉10 km upstream of the grounding line. Tidal flexing is observed 〉6 km upstream of the grounding line including cm-scale uplift. Tidal grounding line migration is small and 〈40 % of the ice thickness. The frequency doubling of horizontal displacements relative to the ocean tides is consistent with variable ice-shelf buttressing demonstrated with a visco-elastic Maxwell model. Taken together, this supports previously hypothesized flexural ice softening in the grounding-zone through tides and offers new observational constraints for the role of ice rheology in ice-shelf buttressing.
    Keywords: Antarctica; flowfields; grounding zone dynamics; Ice dynamics; Priestley_Glacier; Terrestrial Radar Interferometry
    Type: Dataset
    Format: application/zip, 1.5 GBytes
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    DATA PANGAEA
  • 10
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    Surface velocities for selected key regions in Greenland and Antarctica (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Surface velocities for the onset of the North East Greenland Ice Stream (NEGIS) are based on SAR interferometry using ascending and descending satellite tracks and the assumption of surface parallel ice flow. Data for the high resolution field (30 m res) in the vicinity of the EGRIP drill site were acquired by TerraSAR-X between 2016 and 2018. TerraSAR-X raw data were made available through DLR proposal HYD2059. Another velocity field at the onset of NEGIS is a mosaic of Sentinel-1 estimates acquired in early 2019, following a similar interferometric processing scheme as for the TerraSAR-X velocity field. The third velocity mosaic covers large parts of NE Greenland and was derived by intensity offset tracking on Sentinel-1 winter acquisitions between 2016 and 2018. Surface velocities in the region of the Filchner-Ronne Ice Shelf (Antarctica) were derived from Sentinel-1 and TerraSAR-X intensity offset tracking and filled with Landsat 8 velocity estimates downloaded from the Global Land Ice Velocity Extraction from the Landsat 8 (GoLIVE) database (Scambos et al., 2016). The higher resolved velocity field of Support Force Glacier (50 m res) is only based on TerraSAR-X intensity offset tracking and GoLIVE velocity estimates. TerraSAR-X raw data were made available through DLR proposal HYD2059.
    Keywords: EastGRIP; EGRIP; Filchner Ice Shelf; Filchner-Ronne-Iceshelf; File content; Greenland; ICEDRILL; Ice drill; Image; Image (File Size); InSAR; offset tracking; remote sensing; surface velocity
    Type: Dataset
    Format: text/tab-separated-values, 38 data points
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