Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event
International audience Understanding the dynamic response of glaciers to climate change is vital for assessing water resources and hazards, and subglacial hydrology is a key player in glacier systems. Traditional observations of subglacial hydrology are spatially and temporally limited, but recent s...
Published in: | Journal of Geophysical Research: Earth Surface |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2022
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Online Access: | https://hal.science/hal-03852647 https://hal.science/hal-03852647/document https://hal.science/hal-03852647/file/Labedz_Revision_1123_VCT_FG.pdf https://doi.org/10.1029/2021JF006406 |
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openpolar |
institution |
Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Labedz, Celeste, Bartholomaus, Timothy, Amundson, Jason, Gimbert, Florent Karplus, Marianne, Tsai, Victor, Veitch, Stephen Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Understanding the dynamic response of glaciers to climate change is vital for assessing water resources and hazards, and subglacial hydrology is a key player in glacier systems. Traditional observations of subglacial hydrology are spatially and temporally limited, but recent seismic deployments on and around glaciers show the potential for comprehensive observation of glacial hydrologic systems. We present results from a high-density seismic deployment spanning the surface of Lemon Creek Glacier, Alaska. Our study coincided with a marginal lake drainage event, which served as a natural experiment for seismic detection of changes in subglacial hydrology. We observed glaciohydraulic tremor across the surface of the glacier that was generated by the subglacial hydrologic system. During the lake drainage, the relative changes in seismic tremor power and water flux are consistent with pressurization of the subglacial system of only the upper part of the glacier. This event was not accompanied by a significant increase in glacier velocity; either some threshold necessary for rapid basal motion was not attained, or, plausibly, the geometry of Lemon Creek Glacier inhibited speedup. This pressurization event would have likely gone undetected without seismic observations, demonstrating the power of cryoseismology in testing assumptions about and mapping the spatial extent of subglacial pressurization. |
author2 |
Seismological Laboratory, California Institute of Technology California Institute of Technology (CALTECH) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) This work was made possible in part by hard work in the field by Margot Vore, Daniel Bowden, Galen Kaip, and the students and staff of the 2017 Juneau Icefield Research Program. We especially thank Matt Beedle for provision of the photogrammetrically-produced DEM of Lake Linda, following lake drainage. This work was also aided by the advice of Mike Gurnis and Rob Clayton. We thank Paul Winberry and two anonymous reviewers for their helpful feedback, which improved this paper greatly. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1745301. This work was made possible in part by a University of Idaho seed grant, #FY18-01. DEM provided by the Polar Geospatial Center under NSF-OPP awards 1043681, 1559691, and 1542736. |
format |
Article in Journal/Newspaper |
author |
Labedz, Celeste, Bartholomaus, Timothy, Amundson, Jason, Gimbert, Florent Karplus, Marianne, Tsai, Victor, Veitch, Stephen |
author_facet |
Labedz, Celeste, Bartholomaus, Timothy, Amundson, Jason, Gimbert, Florent Karplus, Marianne, Tsai, Victor, Veitch, Stephen |
author_sort |
Labedz, Celeste, |
title |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_short |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_full |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_fullStr |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_full_unstemmed |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_sort |
seismic mapping of subglacial hydrology reveals previously undetected pressurization event |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-03852647 https://hal.science/hal-03852647/document https://hal.science/hal-03852647/file/Labedz_Revision_1123_VCT_FG.pdf https://doi.org/10.1029/2021JF006406 |
long_lat |
ENVELOPE(163.500,163.500,-74.600,-74.600) ENVELOPE(177.452,177.452,51.987,51.987) |
geographic |
Marginal Lake Lemon Creek |
geographic_facet |
Marginal Lake Lemon Creek |
genre |
glacier glaciers Alaska |
genre_facet |
glacier glaciers Alaska |
op_source |
ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-03852647 Journal of Geophysical Research: Earth Surface, 2022, 127 (3), ⟨10.1029/2021JF006406⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JF006406 hal-03852647 https://hal.science/hal-03852647 https://hal.science/hal-03852647/document https://hal.science/hal-03852647/file/Labedz_Revision_1123_VCT_FG.pdf doi:10.1029/2021JF006406 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021JF006406 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
127 |
container_issue |
3 |
_version_ |
1766008377946669056 |
spelling |
ftinsu:oai:HAL:hal-03852647v1 2023-05-15T16:20:27+02:00 Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event Labedz, Celeste, Bartholomaus, Timothy, Amundson, Jason, Gimbert, Florent Karplus, Marianne, Tsai, Victor, Veitch, Stephen Seismological Laboratory, California Institute of Technology California Institute of Technology (CALTECH) Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) This work was made possible in part by hard work in the field by Margot Vore, Daniel Bowden, Galen Kaip, and the students and staff of the 2017 Juneau Icefield Research Program. We especially thank Matt Beedle for provision of the photogrammetrically-produced DEM of Lake Linda, following lake drainage. This work was also aided by the advice of Mike Gurnis and Rob Clayton. We thank Paul Winberry and two anonymous reviewers for their helpful feedback, which improved this paper greatly. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1745301. This work was made possible in part by a University of Idaho seed grant, #FY18-01. DEM provided by the Polar Geospatial Center under NSF-OPP awards 1043681, 1559691, and 1542736. 2022-07-08 https://hal.science/hal-03852647 https://hal.science/hal-03852647/document https://hal.science/hal-03852647/file/Labedz_Revision_1123_VCT_FG.pdf https://doi.org/10.1029/2021JF006406 en eng HAL CCSD American Geophysical Union/Wiley info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JF006406 hal-03852647 https://hal.science/hal-03852647 https://hal.science/hal-03852647/document https://hal.science/hal-03852647/file/Labedz_Revision_1123_VCT_FG.pdf doi:10.1029/2021JF006406 info:eu-repo/semantics/OpenAccess ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-03852647 Journal of Geophysical Research: Earth Surface, 2022, 127 (3), ⟨10.1029/2021JF006406⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.1029/2021JF006406 2023-03-15T18:03:16Z International audience Understanding the dynamic response of glaciers to climate change is vital for assessing water resources and hazards, and subglacial hydrology is a key player in glacier systems. Traditional observations of subglacial hydrology are spatially and temporally limited, but recent seismic deployments on and around glaciers show the potential for comprehensive observation of glacial hydrologic systems. We present results from a high-density seismic deployment spanning the surface of Lemon Creek Glacier, Alaska. Our study coincided with a marginal lake drainage event, which served as a natural experiment for seismic detection of changes in subglacial hydrology. We observed glaciohydraulic tremor across the surface of the glacier that was generated by the subglacial hydrologic system. During the lake drainage, the relative changes in seismic tremor power and water flux are consistent with pressurization of the subglacial system of only the upper part of the glacier. This event was not accompanied by a significant increase in glacier velocity; either some threshold necessary for rapid basal motion was not attained, or, plausibly, the geometry of Lemon Creek Glacier inhibited speedup. This pressurization event would have likely gone undetected without seismic observations, demonstrating the power of cryoseismology in testing assumptions about and mapping the spatial extent of subglacial pressurization. Article in Journal/Newspaper glacier glaciers Alaska Institut national des sciences de l'Univers: HAL-INSU Marginal Lake ENVELOPE(163.500,163.500,-74.600,-74.600) Lemon Creek ENVELOPE(177.452,177.452,51.987,51.987) Journal of Geophysical Research: Earth Surface 127 3 |