Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs
Ice shelves control the dynamic mass loss of ice sheets through buttressing and their integrity depends on the spatial variability of their basal mass balance (BMB) i.e., the difference between refreezing and melting. Here, we present an improved technique - based on satellite observations - to capt...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.883285 2023-05-15T13:58:16+02:00 Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs Berger, Sophie Drews, Reinhard Helm, Veit Sun, Sainan Pattyn, Frank LATITUDE: -71.200000 * LONGITUDE: 29.800000 2017-11-20 text/tab-separated-values, 15 data points https://doi.pangaea.de/10.1594/PANGAEA.883285 https://doi.org/10.1594/PANGAEA.883285 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.883285 https://doi.org/10.1594/PANGAEA.883285 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Berger, Sophie; Drews, Reinhard; Helm, Veit; Sun, Sainan; Pattyn, Frank (2017): Detecting high spatial variability of ice-shelf basal mass balance (Roi Baudouin ice shelf, Antarctica). The Cryosphere, 11(6), 2675-2690, https://doi.org/10.5194/tc-11-2675-2017 File content File format File name File size Roi_Baudoin_ice_shelf SAT Satellite remote sensing Uniform resource locator/link to file Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.883285 https://doi.org/10.5194/tc-11-2675-2017 2023-01-20T09:09:59Z Ice shelves control the dynamic mass loss of ice sheets through buttressing and their integrity depends on the spatial variability of their basal mass balance (BMB) i.e., the difference between refreezing and melting. Here, we present an improved technique - based on satellite observations - to capture the small-scale variability in the BMB of ice shelves. As a case study, we apply the methodology to the Roi Baudouin Ice Shelf, Dronning Maud Land, East Antarctica, and derive its yearly averaged BMB at 10 m horizontal gridding. We use mass conservation in a Lagrangian framework based on high-resolution surface velocities, atmospheric-model surface mass balance and hydrostatic ice-thickness fields (derived from TanDEM-X surface elevation). Spatial derivatives are implemented using the total-variation differentiation, which preserves abrupt changes in flow velocities and their spatial gradients. Such changes may reflect a dynamic response to localized basal melting and should be included in the mass budget. Our BMB field exhibits much spatial detail and ranges from -14.7 to 8.6 m/a ice equivalent. Highest melt rates are found close to the grounding line where the pressure melting point is high, and the ice-shelf slope is steep. The BMB field agrees well with on-site measurements from phase-sensitive radar, although independent radar profiling indicates unresolved spatial variations in firn density. We show that an elliptical surface depression (10 m deep and with an extent of 0.7 km ×1.3 km) lowers by 0.5 to 1.4 m/a , which we tentatively attribute to a transient adaptation to hydrostatic equilibrium. We find evidence for elevated melting beneath ice shelf channels (with melting being concentrated on the channel's flanks). However, farther downstream from the grounding line, the majority of ice shelf channels advect passively (i.e. no melting nor refreezing) toward the ice shelf front. Although the absolute, satellite-based BMB values remain uncertain, we have high confidence in the spatial variability on ... Dataset Antarc* Antarctica Dronning Maud Land East Antarctica Ice Shelf Ice Shelves The Cryosphere PANGAEA - Data Publisher for Earth & Environmental Science East Antarctica Dronning Maud Land Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) ENVELOPE(29.800000,29.800000,-71.200000,-71.200000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
File content File format File name File size Roi_Baudoin_ice_shelf SAT Satellite remote sensing Uniform resource locator/link to file |
spellingShingle |
File content File format File name File size Roi_Baudoin_ice_shelf SAT Satellite remote sensing Uniform resource locator/link to file Berger, Sophie Drews, Reinhard Helm, Veit Sun, Sainan Pattyn, Frank Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs |
topic_facet |
File content File format File name File size Roi_Baudoin_ice_shelf SAT Satellite remote sensing Uniform resource locator/link to file |
description |
Ice shelves control the dynamic mass loss of ice sheets through buttressing and their integrity depends on the spatial variability of their basal mass balance (BMB) i.e., the difference between refreezing and melting. Here, we present an improved technique - based on satellite observations - to capture the small-scale variability in the BMB of ice shelves. As a case study, we apply the methodology to the Roi Baudouin Ice Shelf, Dronning Maud Land, East Antarctica, and derive its yearly averaged BMB at 10 m horizontal gridding. We use mass conservation in a Lagrangian framework based on high-resolution surface velocities, atmospheric-model surface mass balance and hydrostatic ice-thickness fields (derived from TanDEM-X surface elevation). Spatial derivatives are implemented using the total-variation differentiation, which preserves abrupt changes in flow velocities and their spatial gradients. Such changes may reflect a dynamic response to localized basal melting and should be included in the mass budget. Our BMB field exhibits much spatial detail and ranges from -14.7 to 8.6 m/a ice equivalent. Highest melt rates are found close to the grounding line where the pressure melting point is high, and the ice-shelf slope is steep. The BMB field agrees well with on-site measurements from phase-sensitive radar, although independent radar profiling indicates unresolved spatial variations in firn density. We show that an elliptical surface depression (10 m deep and with an extent of 0.7 km ×1.3 km) lowers by 0.5 to 1.4 m/a , which we tentatively attribute to a transient adaptation to hydrostatic equilibrium. We find evidence for elevated melting beneath ice shelf channels (with melting being concentrated on the channel's flanks). However, farther downstream from the grounding line, the majority of ice shelf channels advect passively (i.e. no melting nor refreezing) toward the ice shelf front. Although the absolute, satellite-based BMB values remain uncertain, we have high confidence in the spatial variability on ... |
format |
Dataset |
author |
Berger, Sophie Drews, Reinhard Helm, Veit Sun, Sainan Pattyn, Frank |
author_facet |
Berger, Sophie Drews, Reinhard Helm, Veit Sun, Sainan Pattyn, Frank |
author_sort |
Berger, Sophie |
title |
Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs |
title_short |
Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs |
title_full |
Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs |
title_fullStr |
Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs |
title_full_unstemmed |
Surface elevation, hydrostatic ice thickness and basal mass balance of the Roi Baudouin Ice Shelf, East Antarctica, link to GeoTIFFs |
title_sort |
surface elevation, hydrostatic ice thickness and basal mass balance of the roi baudouin ice shelf, east antarctica, link to geotiffs |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.883285 https://doi.org/10.1594/PANGAEA.883285 |
op_coverage |
LATITUDE: -71.200000 * LONGITUDE: 29.800000 |
long_lat |
ENVELOPE(24.461,24.461,-70.438,-70.438) ENVELOPE(29.800000,29.800000,-71.200000,-71.200000) |
geographic |
East Antarctica Dronning Maud Land Roi Baudouin |
geographic_facet |
East Antarctica Dronning Maud Land Roi Baudouin |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Shelf Ice Shelves The Cryosphere |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Shelf Ice Shelves The Cryosphere |
op_source |
Supplement to: Berger, Sophie; Drews, Reinhard; Helm, Veit; Sun, Sainan; Pattyn, Frank (2017): Detecting high spatial variability of ice-shelf basal mass balance (Roi Baudouin ice shelf, Antarctica). The Cryosphere, 11(6), 2675-2690, https://doi.org/10.5194/tc-11-2675-2017 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.883285 https://doi.org/10.1594/PANGAEA.883285 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.883285 https://doi.org/10.5194/tc-11-2675-2017 |
_version_ |
1766266488558190592 |