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  • 1
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    Stagnant ice and age modelling in the Dome C region, Antarctica (2023)
    Copernicus Publications
    In:  EPIC3The Cryosphere, Copernicus Publications, 17(8), pp. 3461-3483, ISSN: 1994-0416
    Details
    Publication Date: 2023-10-19
    Description: The European Beyond EPICA project aims to extract a continuous ice core of up to 1.5 Ma, with a maximum age density of 20 kyr m-1 at Little Dome C (LDC). We present a 1D numerical model which calculates the age of the ice around Dome C. The model inverts for basal conditions and accounts either for melting or for a layer of stagnant ice above the bedrock. It is constrained by internal reflecting horizons traced in radargrams and dated using the EPICA Dome C (EDC) ice core age profile. We used three different radar datasets ranging from a 10 000 km2 airborne survey down to 5 km long ground-based radar transects over LDC. We find that stagnant ice exists in many places, including above the LDC relief where the new Beyond EPICA drill site (BELDC) is located. The modelled thickness of this layer of stagnant ice roughly corresponds to the thickness of the basal unit observed in one of the radar surveys and in the autonomous phase-sensitive radio-echo sounder (ApRES) dataset. At BELDC, the modelled stagnant ice thickness is 198±44 m and the modelled oldest age of ice is 1.45±0.16 Ma at a depth of 2494±30 m. This is very similar to all sites situated on the LDC relief, including that of the Million Year Ice Core project being conducted by the Australian Antarctic Division. The model was also applied to radar data in the area 10-15 km north of EDC (North Patch), where we find either a thin layer of stagnant ice (generally 〈60 m) or a negligible melt rate (〈0.1 mm yr-1). The modelled maximum age at North Patch is over 2 Ma in most places, with ice at 1.5 Ma having a resolution of 9-12 kyr m-1, making it an exciting prospect for a future Oldest Ice drill site.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Expected Availability
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    PAPER (OA)
  • 2
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    Mapping age and basal conditions of ice in the Dome Fuji region, Antarctica, by combining radar internal layer stratigraphy and flow modeling (2023)
    Copernicus Publications
    In:  EPIC3The Cryosphere, Copernicus Publications, 17(10), pp. 4297-4314, ISSN: 1994-0416
    Details
    Publication Date: 2024-05-21
    Description: The Dome Fuji (DF) region in Antarctica is a potential site for an ice core with a record of over 1 Myr. Here, we combine large-scale internal airborne radar stratigraphy with a 1-D model to estimate the age of basal ice in the DF region. The radar data used in the study were collected in a survey during the 2016-2017 Antarctic season. We transfer the latest age-depth scales from the DF ice core to isochrones traced in radargrams in the surrounding 500 km × 550 km region. At each point of the survey the 1-D model uses the ages of isochrones to construct the age-depth scale at depths where dated isochrones do not exist, the surface accumulation rate and the basal thermal condition, including melt rate and the thickness of stagnant ice. Our resulting age distribution and age density suggest that several promising sites with ice older than 1.5 Myr in the DF region might exist. The deduced melt rates and presence of stagnant ice provide more constraints for locating sites with a cold base. The accumulation rates range from 0.015 to 0.038 m a-1 ice equivalent. Based on sensitivity studies we find that the number and depth of picked isochrones and the timescale of the ice core severely affect the model results. Our study demonstrates that constraints from deep radar isochrones and a trustworthy timescale could improve the model estimation to find old ice in the DF region.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
    Location Call Number Expected Availability
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    PAPER (OA)
  • 3
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    Internal reflecting horizon 2 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 206604 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 4
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    Internal reflecting horizon 19 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201002; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201002; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 209144 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 5
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    Internal reflecting horizon 5 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201002; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201002; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 208900 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 6
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    Internal reflecting horizon 8 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201002; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201002; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 208752 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 7
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    Internal reflecting horizon 11 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201002; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201002; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 209016 data points
    Location Call Number Expected Availability
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    DATA PANGAEA
  • 8
    facet.materialart.
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    Internal reflecting horizon 12 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201002; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201002; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 208984 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 9
    facet.materialart.
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    Internal reflecting horizon 13 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201002; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201002; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 209100 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
  • 10
    facet.materialart.
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    Internal reflecting horizon 14 at Little Dome C, Antarctica (2023)
    PANGAEA
    Details
    Publication Date: 2023-12-20
    Description: This dataset of radio-echo sounding internal reflecting horizons (IRH) which were traced across the radar surveys conducted in the 2019/20 Antarctic summer season at Little Come C, in the Dome C region of the East Antarctic Plateau. The data set is associated to publication: Chung, A., et al. (2023). The data were collected during a radar survey conducted in the Antarctic field seasons of 2019-20 using the Little Dome C - Very High Frequency (LDC-VHF) multichannel coherent radar depth sounder developed through a collaboration of The University of Alabama (UA), the University of Copenhagen (CPH) and the Alfred Wegener Institute (AWI). The survey covered Patches A and B of Little Dome C (Lilien et al., 2021), in order to select the exact drill site for the Beyond EPICA Oldest Ice drilling project. The datasets consists of 12 transects systematically covering Patches A and B with parallel lines, over an area of approximately 5×8 km^2. The dataset contains 19 IRHs, the basal unit horizon and the ice-bed interface which were manually traced by Ailsa Chung, using the seismic environment of the Echos software from Paradigm Geophysical. A single file for each IRH is provided in a text file, tab separated format with both depth and two-way travel time. The conversion to depth done using c = 0.1685 m/μs and firn correction of 10 m. The IRHs are provided at approximately 3.5 m spacial resolution.
    Keywords: 20201001; 20201002; 20201003; 20201004; 20201005; 20201006; 20201007; 20201008; 20201009; 20201010; 20201011; 20201012; Antarctica; ANT-Land_2019_BE-OI; AWI Antarctic Land Expedition; BE-OI; Beyond EPICA - Oldest Ice; Calculated; Depth of internal reflection horizon, below ice surface; Distance; Dome C; Dome C, Antarctica; Event label; Internal Reflection Horizon; LATITUDE; LDC-VHF; LDC-VHF_20201001; LDC-VHF_20201002; LDC-VHF_20201003; LDC-VHF_20201004; LDC-VHF_20201005; LDC-VHF_20201006; LDC-VHF_20201007; LDC-VHF_20201008; LDC-VHF_20201009; LDC-VHF_20201010; LDC-VHF_20201011; LDC-VHF_20201012; Line; Little Dome C - Very High Frequency multichannel coherent radar depth sounder; LONGITUDE; radio echo sounding; Two-way traveltime
    Type: Dataset
    Format: text/tab-separated-values, 209124 data points
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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