Marine outlet glacier dynamics, steady states and steady-state stability
Laterally confined marine outlet glaciers exhibit a diverse range of behaviours. This study investigates time-evolving and steady configurations of such glaciers. Using simplified analytic models, it determines conditions for steady states, their stability and expressions for the rate of the calving...
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Cambridge University Press
2022
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ftdoajarticles:oai:doaj.org/article:8103795a2a1e41f4be27a0f857214103 2023-05-15T16:57:33+02:00 Marine outlet glacier dynamics, steady states and steady-state stability O. V. Sergienko 2022-10-01T00:00:00Z https://doi.org/10.1017/jog.2022.13 https://doaj.org/article/8103795a2a1e41f4be27a0f857214103 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143022000132/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.13 0022-1430 1727-5652 https://doaj.org/article/8103795a2a1e41f4be27a0f857214103 Journal of Glaciology, Vol 68, Pp 946-960 (2022) Glacier flow glacier modelling ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2022 ftdoajarticles https://doi.org/10.1017/jog.2022.13 2023-03-12T01:30:54Z Laterally confined marine outlet glaciers exhibit a diverse range of behaviours. This study investigates time-evolving and steady configurations of such glaciers. Using simplified analytic models, it determines conditions for steady states, their stability and expressions for the rate of the calving-front migration for three widely used calving rules. It also investigates the effects of ice mélange when it is present. The results show that ice flux at the terminus is an implicit function of ice thickness that depends on the glacier geometric and dynamic parameters. As a consequence, stability of steady-state configurations is determined by a complex combination of these parameters, specifics of the calving rule and the details of mélange stress conditions. The derived expressions of the rate of terminus migration suggest a non-linear feedback between the migration rate and the calving-front position. A close agreement between the obtained analytic expressions and numerical simulations suggests that these expressions can be used to gain insights into the observed behaviour of the glaciers and also to use observations to improve understanding of calving conditions. Article in Journal/Newspaper Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Journal of Glaciology 1 15 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Glacier flow glacier modelling ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Glacier flow glacier modelling ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 O. V. Sergienko Marine outlet glacier dynamics, steady states and steady-state stability |
topic_facet |
Glacier flow glacier modelling ice dynamics Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
Laterally confined marine outlet glaciers exhibit a diverse range of behaviours. This study investigates time-evolving and steady configurations of such glaciers. Using simplified analytic models, it determines conditions for steady states, their stability and expressions for the rate of the calving-front migration for three widely used calving rules. It also investigates the effects of ice mélange when it is present. The results show that ice flux at the terminus is an implicit function of ice thickness that depends on the glacier geometric and dynamic parameters. As a consequence, stability of steady-state configurations is determined by a complex combination of these parameters, specifics of the calving rule and the details of mélange stress conditions. The derived expressions of the rate of terminus migration suggest a non-linear feedback between the migration rate and the calving-front position. A close agreement between the obtained analytic expressions and numerical simulations suggests that these expressions can be used to gain insights into the observed behaviour of the glaciers and also to use observations to improve understanding of calving conditions. |
format |
Article in Journal/Newspaper |
author |
O. V. Sergienko |
author_facet |
O. V. Sergienko |
author_sort |
O. V. Sergienko |
title |
Marine outlet glacier dynamics, steady states and steady-state stability |
title_short |
Marine outlet glacier dynamics, steady states and steady-state stability |
title_full |
Marine outlet glacier dynamics, steady states and steady-state stability |
title_fullStr |
Marine outlet glacier dynamics, steady states and steady-state stability |
title_full_unstemmed |
Marine outlet glacier dynamics, steady states and steady-state stability |
title_sort |
marine outlet glacier dynamics, steady states and steady-state stability |
publisher |
Cambridge University Press |
publishDate |
2022 |
url |
https://doi.org/10.1017/jog.2022.13 https://doaj.org/article/8103795a2a1e41f4be27a0f857214103 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 68, Pp 946-960 (2022) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143022000132/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2022.13 0022-1430 1727-5652 https://doaj.org/article/8103795a2a1e41f4be27a0f857214103 |
op_doi |
https://doi.org/10.1017/jog.2022.13 |
container_title |
Journal of Glaciology |
container_start_page |
1 |
op_container_end_page |
15 |
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1766049120102907904 |