Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica
Ice shelves control the dynamic mass loss of ice sheets through buttressing. Their integrity also depends on their total mass balance, with the the spatial variability of their basal mass balance (BMB), i.e. the difference between basal refreezing and melting, being an important component. Here, we...
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ftawi:oai:epic.awi.de:49587 2023-05-15T13:45:21+02:00 Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica Berger, Sophie Neckel, Niklas Helm, Veit Dörr, Nils Drews, Reinhard Pattyn, Frank Eisen, Olaf 2019-04-09 application/pdf https://epic.awi.de/id/eprint/49587/ https://epic.awi.de/id/eprint/49587/1/EGU2019-2769-2.pdf https://hdl.handle.net/10013/epic.145178fb-0220-4f24-a161-edd946290906 https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/49587/1/EGU2019-2769-2.pdf https://hdl.handle.net/ Berger, S. orcid:0000-0003-4095-9323 , Neckel, N. orcid:0000-0003-4300-5488 , Helm, V. orcid:0000-0001-7788-9328 , Dörr, N. , Drews, R. , Pattyn, F. and Eisen, O. orcid:0000-0002-6380-962X (2019) Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica , EGU General Assembly, Vienna, 7 April 2019 - 12 April 2019 . hdl:10013/epic.145178fb-0220-4f24-a161-edd946290906 EPIC3EGU General Assembly, Vienna, 2019-04-07-2019-04-12 Conference notRev 2019 ftawi 2021-12-24T15:44:42Z Ice shelves control the dynamic mass loss of ice sheets through buttressing. Their integrity also depends on their total mass balance, with the the spatial variability of their basal mass balance (BMB), i.e. the difference between basal refreezing and melting, being an important component. Here, we present an improved technique – based on satellite observations – to capture the small-scale variability in the BMB of ice shelves. We use mass conservation in a Lagrangian framework based on high-resolution horizontal 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. After successfully developing the technique with TanDEM-X elevations from 2013-2014 for the Roi Baudouin Ice Shelf, Dronning Maud Land, East Antarctica (Fig. 1), we upscaled our results spatially to all ice shelves in Dronning Maud Land that are located between Fimbul and Roi Baudouin ice shelves. The BMB field we produce shows a large-scale pattern in close agreement with previous and studies in coarser resolution. However,our results also indicate that we are in addition able to detect small-scale features in the BMB with unprecedented detail (at a gridding of <50 m). Beyond the static field of BMB we also investigate temporal changes in the BMB by combining our BMB basedon TanDEM-X elevations with coarser BMB based on Cryosat-2 data. Conference Object Antarc* Antarctica Dronning Maud Land East Antarctica Ice Shelf Ice Shelves Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Dronning Maud Land East Antarctica Roi Baudouin ENVELOPE(24.461,24.461,-70.438,-70.438) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Ice shelves control the dynamic mass loss of ice sheets through buttressing. Their integrity also depends on their total mass balance, with the the spatial variability of their basal mass balance (BMB), i.e. the difference between basal refreezing and melting, being an important component. Here, we present an improved technique – based on satellite observations – to capture the small-scale variability in the BMB of ice shelves. We use mass conservation in a Lagrangian framework based on high-resolution horizontal 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. After successfully developing the technique with TanDEM-X elevations from 2013-2014 for the Roi Baudouin Ice Shelf, Dronning Maud Land, East Antarctica (Fig. 1), we upscaled our results spatially to all ice shelves in Dronning Maud Land that are located between Fimbul and Roi Baudouin ice shelves. The BMB field we produce shows a large-scale pattern in close agreement with previous and studies in coarser resolution. However,our results also indicate that we are in addition able to detect small-scale features in the BMB with unprecedented detail (at a gridding of <50 m). Beyond the static field of BMB we also investigate temporal changes in the BMB by combining our BMB basedon TanDEM-X elevations with coarser BMB based on Cryosat-2 data. |
format |
Conference Object |
author |
Berger, Sophie Neckel, Niklas Helm, Veit Dörr, Nils Drews, Reinhard Pattyn, Frank Eisen, Olaf |
spellingShingle |
Berger, Sophie Neckel, Niklas Helm, Veit Dörr, Nils Drews, Reinhard Pattyn, Frank Eisen, Olaf Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica |
author_facet |
Berger, Sophie Neckel, Niklas Helm, Veit Dörr, Nils Drews, Reinhard Pattyn, Frank Eisen, Olaf |
author_sort |
Berger, Sophie |
title |
Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica |
title_short |
Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica |
title_full |
Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica |
title_fullStr |
Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica |
title_full_unstemmed |
Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica |
title_sort |
detecting and monitoring ice-shelf basal mass balance in dronning maud land, east antarctica |
publishDate |
2019 |
url |
https://epic.awi.de/id/eprint/49587/ https://epic.awi.de/id/eprint/49587/1/EGU2019-2769-2.pdf https://hdl.handle.net/10013/epic.145178fb-0220-4f24-a161-edd946290906 https://hdl.handle.net/ |
long_lat |
ENVELOPE(24.461,24.461,-70.438,-70.438) |
geographic |
Dronning Maud Land East Antarctica Roi Baudouin |
geographic_facet |
Dronning Maud Land East Antarctica Roi Baudouin |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica Ice Shelf Ice Shelves |
op_source |
EPIC3EGU General Assembly, Vienna, 2019-04-07-2019-04-12 |
op_relation |
https://epic.awi.de/id/eprint/49587/1/EGU2019-2769-2.pdf https://hdl.handle.net/ Berger, S. orcid:0000-0003-4095-9323 , Neckel, N. orcid:0000-0003-4300-5488 , Helm, V. orcid:0000-0001-7788-9328 , Dörr, N. , Drews, R. , Pattyn, F. and Eisen, O. orcid:0000-0002-6380-962X (2019) Detecting and monitoring ice-shelf basal mass balance in Dronning Maud Land, East Antarctica , EGU General Assembly, Vienna, 7 April 2019 - 12 April 2019 . hdl:10013/epic.145178fb-0220-4f24-a161-edd946290906 |
_version_ |
1766221593345785856 |