Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica
Recovery Glacier reaches far into the East Antarctic Ice Sheet. Recent projections point out that its dynamic behaviour has a considerable impact on future Antarctic ice loss (Golledge et al. 2017). Subglacial lakes are thought to play a major role in the initiation of the rapid ice flow (Bell et al...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.894294 2023-05-15T14:04:56+02:00 Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas MEDIAN LATITUDE: -86.622603 * MEDIAN LONGITUDE: -2.761496 * SOUTH-BOUND LATITUDE: -90.000000 * WEST-BOUND LONGITUDE: -38.570099 * NORTH-BOUND LATITUDE: -80.467499 * EAST-BOUND LONGITUDE: 32.908100 * DATE/TIME START: 2014-01-17T16:18:49 * DATE/TIME END: 2014-01-28T13:34:25 2018-09-17 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.894294 https://doi.org/10.1594/PANGAEA.894294 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.894294 https://doi.org/10.1594/PANGAEA.894294 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Humbert, Angelika; Steinhage, Daniel; Helm, Veit; Beyer, Sebastian; Kleiner, Thomas (2018): Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica. Journal of Geophysical Research-Earth Surface, 123(11), 2802-2826, https://doi.org/10.1029/2017JF004591 Antarctica AWI_Glac Glaciology @ AWI Dataset 2018 ftpangaea https://doi.org/10.1594/PANGAEA.894294 https://doi.org/10.1029/2017JF004591 2023-01-20T07:34:12Z Recovery Glacier reaches far into the East Antarctic Ice Sheet. Recent projections point out that its dynamic behaviour has a considerable impact on future Antarctic ice loss (Golledge et al. 2017). Subglacial lakes are thought to play a major role in the initiation of the rapid ice flow (Bell et al. 2007). Satellite altimetry observations have even suggested several actively filling and draining subglacial lakes beneath the main trunk (Smith et al. 2009). We present new data of the geometry of this glacier and investigate its basal properties employing radio-echo sounding. Using ice-sheet modelling, we were able to constrain estimates of radar absorption in the ice, but uncertainties remain large. The magnitude of the basal reflection coefficient is thus still poorly known. However, its spatial variability, in conjunction with additional indicators, can be used to infer the presence of subglacial water. We find no clear evidence of water at most of the previously proposed lake sites. Especially locations where altimetry detected active lakes, do not exhibit lake characteristics in RES. We argue that lakes far upstream the main trunk are not triggering enhanced ice flow, which is also supported by modeled subglacial hydrology. Dataset Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Recovery Glacier PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Antarctic Ice Sheet Recovery Glacier ENVELOPE(-25.500,-25.500,-81.166,-81.166) ENVELOPE(-38.570099,32.908100,-80.467499,-90.000000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Antarctica AWI_Glac Glaciology @ AWI |
spellingShingle |
Antarctica AWI_Glac Glaciology @ AWI Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica |
topic_facet |
Antarctica AWI_Glac Glaciology @ AWI |
description |
Recovery Glacier reaches far into the East Antarctic Ice Sheet. Recent projections point out that its dynamic behaviour has a considerable impact on future Antarctic ice loss (Golledge et al. 2017). Subglacial lakes are thought to play a major role in the initiation of the rapid ice flow (Bell et al. 2007). Satellite altimetry observations have even suggested several actively filling and draining subglacial lakes beneath the main trunk (Smith et al. 2009). We present new data of the geometry of this glacier and investigate its basal properties employing radio-echo sounding. Using ice-sheet modelling, we were able to constrain estimates of radar absorption in the ice, but uncertainties remain large. The magnitude of the basal reflection coefficient is thus still poorly known. However, its spatial variability, in conjunction with additional indicators, can be used to infer the presence of subglacial water. We find no clear evidence of water at most of the previously proposed lake sites. Especially locations where altimetry detected active lakes, do not exhibit lake characteristics in RES. We argue that lakes far upstream the main trunk are not triggering enhanced ice flow, which is also supported by modeled subglacial hydrology. |
format |
Dataset |
author |
Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas |
author_facet |
Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas |
author_sort |
Humbert, Angelika |
title |
Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica |
title_short |
Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica |
title_full |
Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica |
title_fullStr |
Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica |
title_full_unstemmed |
Ice thickness from radio-echo sounding (RES) and radar attenuation from numerical modelling for Recovery Glacier, Antarctica |
title_sort |
ice thickness from radio-echo sounding (res) and radar attenuation from numerical modelling for recovery glacier, antarctica |
publisher |
PANGAEA |
publishDate |
2018 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.894294 https://doi.org/10.1594/PANGAEA.894294 |
op_coverage |
MEDIAN LATITUDE: -86.622603 * MEDIAN LONGITUDE: -2.761496 * SOUTH-BOUND LATITUDE: -90.000000 * WEST-BOUND LONGITUDE: -38.570099 * NORTH-BOUND LATITUDE: -80.467499 * EAST-BOUND LONGITUDE: 32.908100 * DATE/TIME START: 2014-01-17T16:18:49 * DATE/TIME END: 2014-01-28T13:34:25 |
long_lat |
ENVELOPE(-25.500,-25.500,-81.166,-81.166) ENVELOPE(-38.570099,32.908100,-80.467499,-90.000000) |
geographic |
Antarctic East Antarctic Ice Sheet Recovery Glacier |
geographic_facet |
Antarctic East Antarctic Ice Sheet Recovery Glacier |
genre |
Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Recovery Glacier |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Recovery Glacier |
op_source |
Supplement to: Humbert, Angelika; Steinhage, Daniel; Helm, Veit; Beyer, Sebastian; Kleiner, Thomas (2018): Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica. Journal of Geophysical Research-Earth Surface, 123(11), 2802-2826, https://doi.org/10.1029/2017JF004591 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.894294 https://doi.org/10.1594/PANGAEA.894294 |
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.894294 https://doi.org/10.1029/2017JF004591 |
_version_ |
1766276405683814400 |