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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ftawi:oai:epic.awi.de:48359 2023-05-15T13:45:21+02:00 Missing evidence of widespread subglacial lakes at Recovery Glacier, Antarctica Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas 2018-11-07 application/pdf https://epic.awi.de/id/eprint/48359/ https://epic.awi.de/id/eprint/48359/1/humbert2018jgr.pdf https://hdl.handle.net/10013/epic.2cfa7ae5-c211-47d2-9a82-f9e136d64478 https://hdl.handle.net/ unknown Wiley https://epic.awi.de/id/eprint/48359/1/humbert2018jgr.pdf https://hdl.handle.net/ Humbert, A. , Steinhage, D. orcid:0000-0003-4737-9751 , Helm, V. orcid:0000-0001-7788-9328 , Beyer, S. orcid:0000-0002-3731-0278 and Kleiner, T. orcid:0000-0001-7825-5765 (2018) Missing evidence of widespread subglacial lakes at Recovery Glacier, Antarctica , Journal of Geophysical Research: Earth Surface, 123 , pp. 2802-2826 . doi:10.1029/2017JF004591 <https://doi.org/10.1029/2017JF004591> , hdl:10013/epic.2cfa7ae5-c211-47d2-9a82-f9e136d64478 EPIC3Journal of Geophysical Research: Earth Surface, Wiley, 123, pp. 2802-2826 Article isiRev 2018 ftawi https://doi.org/10.1029/2017JF004591 2021-12-24T15:44:17Z 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 Antarctica Journal Ice Sheet Recovery Glacier Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic East Antarctic Ice Sheet Recovery Glacier ENVELOPE(-25.500,-25.500,-81.166,-81.166) Journal of Geophysical Research: Earth Surface 123 11 2802 2826 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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 |
spellingShingle |
Humbert, Angelika Steinhage, Daniel Helm, Veit Beyer, Sebastian Kleiner, Thomas Missing evidence of widespread subglacial lakes at Recovery Glacier, Antarctica |
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 |
Wiley |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/48359/ https://epic.awi.de/id/eprint/48359/1/humbert2018jgr.pdf https://hdl.handle.net/10013/epic.2cfa7ae5-c211-47d2-9a82-f9e136d64478 https://hdl.handle.net/ |
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 Antarctica Journal Ice Sheet Recovery Glacier |
genre_facet |
Antarc* Antarctic Antarctica Antarctica Journal Ice Sheet Recovery Glacier |
op_source |
EPIC3Journal of Geophysical Research: Earth Surface, Wiley, 123, pp. 2802-2826 |
op_relation |
https://epic.awi.de/id/eprint/48359/1/humbert2018jgr.pdf https://hdl.handle.net/ Humbert, A. , Steinhage, D. orcid:0000-0003-4737-9751 , Helm, V. orcid:0000-0001-7788-9328 , Beyer, S. orcid:0000-0002-3731-0278 and Kleiner, T. orcid:0000-0001-7825-5765 (2018) Missing evidence of widespread subglacial lakes at Recovery Glacier, Antarctica , Journal of Geophysical Research: Earth Surface, 123 , pp. 2802-2826 . doi:10.1029/2017JF004591 <https://doi.org/10.1029/2017JF004591> , hdl:10013/epic.2cfa7ae5-c211-47d2-9a82-f9e136d64478 |
op_doi |
https://doi.org/10.1029/2017JF004591 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
123 |
container_issue |
11 |
container_start_page |
2802 |
op_container_end_page |
2826 |
_version_ |
1766221396277460992 |