Time series of Lagrangian basal melt rates at 79°N Glacier since 2016
Estimated time series of Lagrangian basal melt rates from an autonomous phase-sensitive radar (ApRES) measurement at 79°N Glacier (Nioghalvfjerdsfjorden Glacier) in northeast Greenland since 2016. Measurement intervals ranged from one to six hours. Basal melt rates are based on the quantification of...
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2024
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.928903 2024-06-23T07:50:56+00:00 Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 Zeising, Ole Steinhage, Daniel Neckel, Niklas Humbert, Angelika MEDIAN LATITUDE: 79.378989 * MEDIAN LONGITUDE: -22.299163 * SOUTH-BOUND LATITUDE: 79.323600 * WEST-BOUND LONGITUDE: -22.443000 * NORTH-BOUND LATITUDE: 79.418800 * EAST-BOUND LONGITUDE: -21.982300 * DATE/TIME START: 2016-08-23T14:39:17 * DATE/TIME END: 2023-09-05T20:26:51 2024 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.928903 https://doi.org/10.1594/PANGAEA.928903 en eng PANGAEA Zeising, Ole; Neckel, Niklas; Dörr, Nils; Helm, Veit; Steinhage, Daniel; Timmermann, Ralph; Humbert, Angelika (2024): Extreme melting at Greenland's largest floating ice tongue. The Cryosphere, 18, 1333-1357, https://doi.org/10.5194/tc-18-1333-2024 https://doi.pangaea.de/10.1594/PANGAEA.928903 https://doi.org/10.1594/PANGAEA.928903 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess 79°N Glacier ApRES Autonomous phase-sensitive radio-echo sounder AWI Arctic Land Expedition Basal melt rates CalvDis2022 CalvDis2022_ApRES CalvDis2023 CalvDis2023_ApRES GL-Land_2017_iGRIFF GL-Land_2018_iGRIFF GL-Land_2022_CalvDis GL-Land_2023_CalvDis Greenland Greenland - Ice Sheet/Ocean Interaction: From process understanding to an analysis of the regional system GROCE iGRIFF_ApRES1 iGRIFF_ApRES2a iGRIFF_ApRES2b iGRIFF_ApRES3 iGRIFF 79°N Glacier Expedition Nioghalvfjerdsfjorden Glacier Northeast Greenland Dataset 2024 ftpangaea https://doi.org/10.1594/PANGAEA.92890310.5194/tc-18-1333-2024 2024-06-12T14:17:12Z Estimated time series of Lagrangian basal melt rates from an autonomous phase-sensitive radar (ApRES) measurement at 79°N Glacier (Nioghalvfjerdsfjorden Glacier) in northeast Greenland since 2016. Measurement intervals ranged from one to six hours. Basal melt rates are based on the quantification of the ablation, ice deformation due to strain, and the change in ice thickness. All quantities can be estimated from vertical displacements of internal and basal returns of the transmitted signal. We divided the first echogram into 6 m long segments with 5 m overlap starting at a depth of 20 m. For each segment, we derived displacements from complex cross-correlation of the phase of all pairwise time-consecutive measurements. Afterward, we calculated the daily mean values of the displacements. We used the time-mean vertical displacement of internal reflectors to calculate the vertical strain profile. Here only those segments between 20 m below the surface and 20 m above the basal return at the last measurement were considered. In addition, we only considered measurements between October and May to avoid the influence of ablation on the calculation of the strain. The vertical strain is the depth derivative of the vertical displacement which we derived from a linear fit that best matches the vertical displacements. We use the displacement time series of the segment centered at a range of 50 m to correct for ablation. Since the ice above is affected by ice deformation, we subtract this contribution from the displacement. To derive the basal melt rate in the vertical direction, we subtract the strain contribution and ablation from the displacement of a basal reflector. We analyzed the vertical displacement for all segments within a range of 50 m below the first basal return to obtain the nadir and off-nadir basal melt rates. To represent the variability within a time series, we calculated the median melt rate next to the 25 %, 75 %, and 95 % quantile for each time step. Afterward, a 7-day moving average filter was used to ... Dataset Arctic glacier Greenland Ice Sheet Nioghalvfjerdsfjorden The Cryosphere PANGAEA - Data Publisher for Earth & Environmental Science Arctic Greenland Nioghalvfjerdsfjorden ENVELOPE(-21.500,-21.500,79.500,79.500) ENVELOPE(-22.443000,-21.982300,79.418800,79.323600) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
79°N Glacier ApRES Autonomous phase-sensitive radio-echo sounder AWI Arctic Land Expedition Basal melt rates CalvDis2022 CalvDis2022_ApRES CalvDis2023 CalvDis2023_ApRES GL-Land_2017_iGRIFF GL-Land_2018_iGRIFF GL-Land_2022_CalvDis GL-Land_2023_CalvDis Greenland Greenland - Ice Sheet/Ocean Interaction: From process understanding to an analysis of the regional system GROCE iGRIFF_ApRES1 iGRIFF_ApRES2a iGRIFF_ApRES2b iGRIFF_ApRES3 iGRIFF 79°N Glacier Expedition Nioghalvfjerdsfjorden Glacier Northeast Greenland |
spellingShingle |
79°N Glacier ApRES Autonomous phase-sensitive radio-echo sounder AWI Arctic Land Expedition Basal melt rates CalvDis2022 CalvDis2022_ApRES CalvDis2023 CalvDis2023_ApRES GL-Land_2017_iGRIFF GL-Land_2018_iGRIFF GL-Land_2022_CalvDis GL-Land_2023_CalvDis Greenland Greenland - Ice Sheet/Ocean Interaction: From process understanding to an analysis of the regional system GROCE iGRIFF_ApRES1 iGRIFF_ApRES2a iGRIFF_ApRES2b iGRIFF_ApRES3 iGRIFF 79°N Glacier Expedition Nioghalvfjerdsfjorden Glacier Northeast Greenland Zeising, Ole Steinhage, Daniel Neckel, Niklas Humbert, Angelika Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 |
topic_facet |
79°N Glacier ApRES Autonomous phase-sensitive radio-echo sounder AWI Arctic Land Expedition Basal melt rates CalvDis2022 CalvDis2022_ApRES CalvDis2023 CalvDis2023_ApRES GL-Land_2017_iGRIFF GL-Land_2018_iGRIFF GL-Land_2022_CalvDis GL-Land_2023_CalvDis Greenland Greenland - Ice Sheet/Ocean Interaction: From process understanding to an analysis of the regional system GROCE iGRIFF_ApRES1 iGRIFF_ApRES2a iGRIFF_ApRES2b iGRIFF_ApRES3 iGRIFF 79°N Glacier Expedition Nioghalvfjerdsfjorden Glacier Northeast Greenland |
description |
Estimated time series of Lagrangian basal melt rates from an autonomous phase-sensitive radar (ApRES) measurement at 79°N Glacier (Nioghalvfjerdsfjorden Glacier) in northeast Greenland since 2016. Measurement intervals ranged from one to six hours. Basal melt rates are based on the quantification of the ablation, ice deformation due to strain, and the change in ice thickness. All quantities can be estimated from vertical displacements of internal and basal returns of the transmitted signal. We divided the first echogram into 6 m long segments with 5 m overlap starting at a depth of 20 m. For each segment, we derived displacements from complex cross-correlation of the phase of all pairwise time-consecutive measurements. Afterward, we calculated the daily mean values of the displacements. We used the time-mean vertical displacement of internal reflectors to calculate the vertical strain profile. Here only those segments between 20 m below the surface and 20 m above the basal return at the last measurement were considered. In addition, we only considered measurements between October and May to avoid the influence of ablation on the calculation of the strain. The vertical strain is the depth derivative of the vertical displacement which we derived from a linear fit that best matches the vertical displacements. We use the displacement time series of the segment centered at a range of 50 m to correct for ablation. Since the ice above is affected by ice deformation, we subtract this contribution from the displacement. To derive the basal melt rate in the vertical direction, we subtract the strain contribution and ablation from the displacement of a basal reflector. We analyzed the vertical displacement for all segments within a range of 50 m below the first basal return to obtain the nadir and off-nadir basal melt rates. To represent the variability within a time series, we calculated the median melt rate next to the 25 %, 75 %, and 95 % quantile for each time step. Afterward, a 7-day moving average filter was used to ... |
format |
Dataset |
author |
Zeising, Ole Steinhage, Daniel Neckel, Niklas Humbert, Angelika |
author_facet |
Zeising, Ole Steinhage, Daniel Neckel, Niklas Humbert, Angelika |
author_sort |
Zeising, Ole |
title |
Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 |
title_short |
Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 |
title_full |
Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 |
title_fullStr |
Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 |
title_full_unstemmed |
Time series of Lagrangian basal melt rates at 79°N Glacier since 2016 |
title_sort |
time series of lagrangian basal melt rates at 79°n glacier since 2016 |
publisher |
PANGAEA |
publishDate |
2024 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.928903 https://doi.org/10.1594/PANGAEA.928903 |
op_coverage |
MEDIAN LATITUDE: 79.378989 * MEDIAN LONGITUDE: -22.299163 * SOUTH-BOUND LATITUDE: 79.323600 * WEST-BOUND LONGITUDE: -22.443000 * NORTH-BOUND LATITUDE: 79.418800 * EAST-BOUND LONGITUDE: -21.982300 * DATE/TIME START: 2016-08-23T14:39:17 * DATE/TIME END: 2023-09-05T20:26:51 |
long_lat |
ENVELOPE(-21.500,-21.500,79.500,79.500) ENVELOPE(-22.443000,-21.982300,79.418800,79.323600) |
geographic |
Arctic Greenland Nioghalvfjerdsfjorden |
geographic_facet |
Arctic Greenland Nioghalvfjerdsfjorden |
genre |
Arctic glacier Greenland Ice Sheet Nioghalvfjerdsfjorden The Cryosphere |
genre_facet |
Arctic glacier Greenland Ice Sheet Nioghalvfjerdsfjorden The Cryosphere |
op_relation |
Zeising, Ole; Neckel, Niklas; Dörr, Nils; Helm, Veit; Steinhage, Daniel; Timmermann, Ralph; Humbert, Angelika (2024): Extreme melting at Greenland's largest floating ice tongue. The Cryosphere, 18, 1333-1357, https://doi.org/10.5194/tc-18-1333-2024 https://doi.pangaea.de/10.1594/PANGAEA.928903 https://doi.org/10.1594/PANGAEA.928903 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.92890310.5194/tc-18-1333-2024 |
_version_ |
1802641879480664064 |