Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica
Recovery Glacier reaches far into the East Antarctic Ice Sheet. Recent projections point out that its dynamic behavior has a considerable impact on future Antarctic ice loss (Golledge et al., 2017, https://doi.org/10.1002/2016GL072422). Subglacial lakes are thought to play a major role in the initia...
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ftleibnizopen:oai:oai.leibnizopen.de:3EmiqIgBdbrxVwz6fvWJ 2023-07-02T03:30:43+02:00 Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas 2018 application/pdf https://oa.tib.eu/renate/handle/123456789/10911 https://doi.org/10.34657/9937 eng eng Washington, DC : [Verlag nicht ermittelbar] CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0 Journal of Geophysical Research: Earth Surface 123 (2018), Nr. 11 altimetry ice modeling ice stream dynamics radio-echo sounding subglacial hydrology 550 article Text 2018 ftleibnizopen https://doi.org/10.34657/9937 2023-06-11T23:33:35Z Recovery Glacier reaches far into the East Antarctic Ice Sheet. Recent projections point out that its dynamic behavior has a considerable impact on future Antarctic ice loss (Golledge et al., 2017, https://doi.org/10.1002/2016GL072422). Subglacial lakes are thought to play a major role in the initiation of the rapid ice flow (Bell et al., 2007, https://doi.org/10.1038/nature05554). Satellite altimetry observations have even suggested several actively filling and draining subglacial lakes beneath the main trunk (B. E. Smith et al., 2009, https://doi.org/10.3189/002214309789470879). We present new data of the geometry of this glacier and investigate its basal properties employing radio-echo sounding. Using ice sheet modeling, 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 radio-echo sounding. We argue that lakes far upstream the main trunk are not triggering enhanced ice flow, which is also supported by modeled subglacial hydrology. publishedVersion Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Recovery Glacier LeibnizOpen (The Leibniz Association) Antarctic East Antarctic Ice Sheet Recovery Glacier ENVELOPE(-25.500,-25.500,-81.166,-81.166) |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
altimetry ice modeling ice stream dynamics radio-echo sounding subglacial hydrology 550 |
spellingShingle |
altimetry ice modeling ice stream dynamics radio-echo sounding subglacial hydrology 550 Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica |
topic_facet |
altimetry ice modeling ice stream dynamics radio-echo sounding subglacial hydrology 550 |
description |
Recovery Glacier reaches far into the East Antarctic Ice Sheet. Recent projections point out that its dynamic behavior has a considerable impact on future Antarctic ice loss (Golledge et al., 2017, https://doi.org/10.1002/2016GL072422). Subglacial lakes are thought to play a major role in the initiation of the rapid ice flow (Bell et al., 2007, https://doi.org/10.1038/nature05554). Satellite altimetry observations have even suggested several actively filling and draining subglacial lakes beneath the main trunk (B. E. Smith et al., 2009, https://doi.org/10.3189/002214309789470879). We present new data of the geometry of this glacier and investigate its basal properties employing radio-echo sounding. Using ice sheet modeling, 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 radio-echo sounding. We argue that lakes far upstream the main trunk are not triggering enhanced ice flow, which is also supported by modeled subglacial hydrology. publishedVersion |
format |
Article in Journal/Newspaper |
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 |
Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica |
title_short |
Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica |
title_full |
Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica |
title_fullStr |
Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica |
title_full_unstemmed |
Missing Evidence of Widespread Subglacial Lakes at Recovery Glacier, Antarctica |
title_sort |
missing evidence of widespread subglacial lakes at recovery glacier, antarctica |
publisher |
Washington, DC : [Verlag nicht ermittelbar] |
publishDate |
2018 |
url |
https://oa.tib.eu/renate/handle/123456789/10911 https://doi.org/10.34657/9937 |
long_lat |
ENVELOPE(-25.500,-25.500,-81.166,-81.166) |
geographic |
Antarctic East Antarctic Ice Sheet Recovery Glacier |
geographic_facet |
Antarctic East Antarctic Ice Sheet Recovery Glacier |
genre |
Antarc* Antarctic Antarctica Ice Sheet Recovery Glacier |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Recovery Glacier |
op_source |
Journal of Geophysical Research: Earth Surface 123 (2018), Nr. 11 |
op_rights |
CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.34657/9937 |
_version_ |
1770275010027454464 |