Modeling oscillations in connected glacial lakes
Mountain glaciers and ice sheets often host marginal and subglacial lakes that are hydraulically connected through subglacial drainage systems. These lakes exhibit complex dynamics that have been the subject of models for decades. Here we introduce and analyze a model for the evolution of glacial la...
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ftdoajarticles:oai:doaj.org/article:ebdfa260650e477db2346acd95b33fa4 2023-05-15T14:13:30+02:00 Modeling oscillations in connected glacial lakes Aaron G. Stubblefield Timothy T. Creyts Jonathan Kingslake Marc Spiegelman 2019-10-01T00:00:00Z https://doi.org/10.1017/jog.2019.46 https://doaj.org/article/ebdfa260650e477db2346acd95b33fa4 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143019000467/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.46 0022-1430 1727-5652 https://doaj.org/article/ebdfa260650e477db2346acd95b33fa4 Journal of Glaciology, Vol 65, Pp 745-758 (2019) Glacier hydrology Jökulhlaups (GLOFs) subglacial lakes subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/jog.2019.46 2023-03-12T01:30:57Z Mountain glaciers and ice sheets often host marginal and subglacial lakes that are hydraulically connected through subglacial drainage systems. These lakes exhibit complex dynamics that have been the subject of models for decades. Here we introduce and analyze a model for the evolution of glacial lakes connected by subglacial channels. Subglacial channel equations are supplied with effective pressure boundary conditions that are determined by a simple lake model. While the model can describe an arbitrary number of lakes, we solve it numerically with a finite element method for the case of two connected lakes. We examine the effect of relative lake size and spacing on the oscillations. Complex oscillations in the downstream lake are driven by discharge out of the upstream lake. These include multi-peaked and anti-phase filling–draining events. Similar filling–draining cycles have been observed on the Kennicott Glacier in Alaska and at the confluence of the Whillans and Mercer ice streams in West Antarctica. We further construct a simplified ordinary differential equation model that displays the same qualitative behavior as the full, spatially-dependent model. We analyze this model using dynamical systems theory to explain the appearance of filling–draining cycles as the meltwater supply varies. Article in Journal/Newspaper Antarc* Antarctica glacier glaciers Journal of Glaciology West Antarctica Alaska Directory of Open Access Journals: DOAJ Articles West Antarctica Mercer ENVELOPE(65.647,65.647,-70.227,-70.227) Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Journal of Glaciology 65 253 745 758 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacier hydrology Jökulhlaups (GLOFs) subglacial lakes subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Glacier hydrology Jökulhlaups (GLOFs) subglacial lakes subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Aaron G. Stubblefield Timothy T. Creyts Jonathan Kingslake Marc Spiegelman Modeling oscillations in connected glacial lakes |
topic_facet |
Glacier hydrology Jökulhlaups (GLOFs) subglacial lakes subglacial processes Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Mountain glaciers and ice sheets often host marginal and subglacial lakes that are hydraulically connected through subglacial drainage systems. These lakes exhibit complex dynamics that have been the subject of models for decades. Here we introduce and analyze a model for the evolution of glacial lakes connected by subglacial channels. Subglacial channel equations are supplied with effective pressure boundary conditions that are determined by a simple lake model. While the model can describe an arbitrary number of lakes, we solve it numerically with a finite element method for the case of two connected lakes. We examine the effect of relative lake size and spacing on the oscillations. Complex oscillations in the downstream lake are driven by discharge out of the upstream lake. These include multi-peaked and anti-phase filling–draining events. Similar filling–draining cycles have been observed on the Kennicott Glacier in Alaska and at the confluence of the Whillans and Mercer ice streams in West Antarctica. We further construct a simplified ordinary differential equation model that displays the same qualitative behavior as the full, spatially-dependent model. We analyze this model using dynamical systems theory to explain the appearance of filling–draining cycles as the meltwater supply varies. |
format |
Article in Journal/Newspaper |
author |
Aaron G. Stubblefield Timothy T. Creyts Jonathan Kingslake Marc Spiegelman |
author_facet |
Aaron G. Stubblefield Timothy T. Creyts Jonathan Kingslake Marc Spiegelman |
author_sort |
Aaron G. Stubblefield |
title |
Modeling oscillations in connected glacial lakes |
title_short |
Modeling oscillations in connected glacial lakes |
title_full |
Modeling oscillations in connected glacial lakes |
title_fullStr |
Modeling oscillations in connected glacial lakes |
title_full_unstemmed |
Modeling oscillations in connected glacial lakes |
title_sort |
modeling oscillations in connected glacial lakes |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/jog.2019.46 https://doaj.org/article/ebdfa260650e477db2346acd95b33fa4 |
long_lat |
ENVELOPE(65.647,65.647,-70.227,-70.227) ENVELOPE(-64.250,-64.250,-84.450,-84.450) |
geographic |
West Antarctica Mercer Whillans |
geographic_facet |
West Antarctica Mercer Whillans |
genre |
Antarc* Antarctica glacier glaciers Journal of Glaciology West Antarctica Alaska |
genre_facet |
Antarc* Antarctica glacier glaciers Journal of Glaciology West Antarctica Alaska |
op_source |
Journal of Glaciology, Vol 65, Pp 745-758 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143019000467/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.46 0022-1430 1727-5652 https://doaj.org/article/ebdfa260650e477db2346acd95b33fa4 |
op_doi |
https://doi.org/10.1017/jog.2019.46 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
253 |
container_start_page |
745 |
op_container_end_page |
758 |
_version_ |
1766285971597295616 |