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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fttibhannoverren:oai:oa.tib.eu:123456789/10911 2023-05-15T13:53:55+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] ISSN:2169-9003 ESSN:2169-9011 DOI:https://doi.org/10.1029/2017jf004591 https://oa.tib.eu/renate/handle/123456789/10911 http://dx.doi.org/10.34657/9937 CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0 frei zugänglich CC-BY-NC-ND Journal of Geophysical Research: Earth Surface 123 (2018), Nr. 11 altimetry ice modeling ice stream dynamics radio-echo sounding subglacial hydrology ddc:550 status-type:publishedVersion doc-type:article doc-type:Text 2018 fttibhannoverren https://doi.org/10.34657/9937 https://doi.org/10.1029/2017jf004591 2023-01-23T17:17:55Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Recovery Glacier Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) Antarctic East Antarctic Ice Sheet Recovery Glacier ENVELOPE(-25.500,-25.500,-81.166,-81.166) |
institution |
Open Polar |
collection |
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
op_collection_id |
fttibhannoverren |
language |
English |
topic |
altimetry ice modeling ice stream dynamics radio-echo sounding subglacial hydrology ddc:550 |
spellingShingle |
altimetry ice modeling ice stream dynamics radio-echo sounding subglacial hydrology ddc: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 ddc: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. |
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_relation |
ISSN:2169-9003 ESSN:2169-9011 DOI:https://doi.org/10.1029/2017jf004591 https://oa.tib.eu/renate/handle/123456789/10911 http://dx.doi.org/10.34657/9937 |
op_rights |
CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0 frei zugänglich |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.34657/9937 https://doi.org/10.1029/2017jf004591 |
_version_ |
1766259391007293440 |