Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier
Hydrologic pathways beneath ice sheets and glaciers play an important role in regulating ice flow. Antarctica has experienced, and will continue to experience, changes in ice dynamics and geometry, but the associated changes in subglacial hydrology have received less attention. Here, we use the GlaD...
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ftdoajarticles:oai:doaj.org/article:127370b60427496584035890776bcade 2023-10-09T21:47:05+02:00 Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier Anna-Mireilla Hayden Christine F. Dow https://doi.org/10.1017/jog.2023.65 https://doaj.org/article/127370b60427496584035890776bcade EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143023000655/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.65 0022-1430 1727-5652 https://doaj.org/article/127370b60427496584035890776bcade Journal of Glaciology, Pp 1-14 Antarctic glaciology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article ftdoajarticles https://doi.org/10.1017/jog.2023.65 2023-09-24T00:37:23Z Hydrologic pathways beneath ice sheets and glaciers play an important role in regulating ice flow. Antarctica has experienced, and will continue to experience, changes in ice dynamics and geometry, but the associated changes in subglacial hydrology have received less attention. Here, we use the GlaDS subglacial hydrology model to examine drainage evolution beneath an idealised Antarctic glacier in response to steepening ice surface slopes, accelerating ice velocities and subglacial lake drainages. Ice surface slope changes exerted a dominant influence, redirecting basal water to different outlet locations and substantially increasing channelised discharge crossing the grounding line. Faster ice velocities had comparatively negligible effects. Subglacial lake drainage results indicated that lake refilling times play a key role in drainage system evolution, with lake flux more readily accommodated following shorter refilling times. Our findings are significant for vulnerable Antarctic regions currently experiencing dynamic thinning since subglacial water re-routing could destabilise ice shelves through enhanced sub-shelf melting, potentially hastening irreversible retreat. These changes could also affect subglacial lake activity. We, therefore, emphasise that including a nuanced and complex representation of subglacial hydrology in ice-sheet models could provide critical information on the timing and magnitude of sea-level change contributions from Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Antarctic Journal of Glaciology 1 14 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Antarctic glaciology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Antarctic glaciology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Anna-Mireilla Hayden Christine F. Dow Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier |
topic_facet |
Antarctic glaciology glacier modelling subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Hydrologic pathways beneath ice sheets and glaciers play an important role in regulating ice flow. Antarctica has experienced, and will continue to experience, changes in ice dynamics and geometry, but the associated changes in subglacial hydrology have received less attention. Here, we use the GlaDS subglacial hydrology model to examine drainage evolution beneath an idealised Antarctic glacier in response to steepening ice surface slopes, accelerating ice velocities and subglacial lake drainages. Ice surface slope changes exerted a dominant influence, redirecting basal water to different outlet locations and substantially increasing channelised discharge crossing the grounding line. Faster ice velocities had comparatively negligible effects. Subglacial lake drainage results indicated that lake refilling times play a key role in drainage system evolution, with lake flux more readily accommodated following shorter refilling times. Our findings are significant for vulnerable Antarctic regions currently experiencing dynamic thinning since subglacial water re-routing could destabilise ice shelves through enhanced sub-shelf melting, potentially hastening irreversible retreat. These changes could also affect subglacial lake activity. We, therefore, emphasise that including a nuanced and complex representation of subglacial hydrology in ice-sheet models could provide critical information on the timing and magnitude of sea-level change contributions from Antarctica. |
format |
Article in Journal/Newspaper |
author |
Anna-Mireilla Hayden Christine F. Dow |
author_facet |
Anna-Mireilla Hayden Christine F. Dow |
author_sort |
Anna-Mireilla Hayden |
title |
Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier |
title_short |
Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier |
title_full |
Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier |
title_fullStr |
Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier |
title_full_unstemmed |
Examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic Antarctic glacier |
title_sort |
examining the effect of ice dynamic changes on subglacial hydrology through modelling of a synthetic antarctic glacier |
publisher |
Cambridge University Press |
url |
https://doi.org/10.1017/jog.2023.65 https://doaj.org/article/127370b60427496584035890776bcade |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Journal of Glaciology |
op_source |
Journal of Glaciology, Pp 1-14 |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143023000655/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2023.65 0022-1430 1727-5652 https://doaj.org/article/127370b60427496584035890776bcade |
op_doi |
https://doi.org/10.1017/jog.2023.65 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
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14 |
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1779309817329876992 |